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denoland-deno/tests/registry/npm/pretty-format/registry.json
David Sherret 998036b399
chore: fix flaky net_listen_allow_localhost_4555 (#23726) 
Moves the test npm registry server port from `4558` to `426x`
2024-05-07 17:21:56 +00:00

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with built-in or user-defined\n plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the\noriginal `print` interface is a reason to use the improved `serialize`\ninterface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","_id":"pretty-format@23.0.0-alpha.2","dist":{"shasum":"c16ab6df05ae34b94536f9aa193ba642db2f9b3c","tarball":"http://localhost:4260/pretty-format/pretty-format-23.0.0-alpha.2.tgz","fileCount":23,"unpackedSize":427160,"integrity":"sha512-HvJZMzGWFa20SW8lqIPYbpwJx8jY2dajPRqmqBgRD1Z3Upm0XYHRfTGA1eTSocCvXzcSYsQ4IE3p6fBhstXhiA==","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQCbCfrKqF/HG41cXouu50caisB/QDryaAs4Momc1xxtgQIhAIyZlgWosO6csbWpkpm7GEPWUE5YAhlgHuYbAWOZVFJH"}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"}],"_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_23.0.0-alpha.2_1522060847231_0.13993785091764677"},"_hasShrinkwrap":false},"23.0.0-alpha.4":{"name":"pretty-format","version":"23.0.0-alpha.4","repository":{"type":"git","url":"https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^3.0.0","ansi-styles":"^3.2.0"},"readmeFilename":"README.md","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n* Supports all built-in JavaScript types\n * primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`,\n `undefined`\n * other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n * collection types:\n * `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`,\n `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`,\n `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n * `Map`, `Set`, `WeakMap`, `WeakSet`\n * `Object`\n* [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n * similar performance to `JSON.stringify` in v8\n * significantly faster than `util.format` in Node.js\n* Serialize application-specific data types with built-in or user-defined\n plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the\noriginal `print` interface is a reason to use the improved `serialize`\ninterface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","_id":"pretty-format@23.0.0-alpha.4","dist":{"shasum":"50990fdbbdfe353da0c1046d965f3c5c9b98866e","tarball":"http://localhost:4260/pretty-format/pretty-format-23.0.0-alpha.4.tgz","fileCount":23,"unpackedSize":430490,"integrity":"sha512-pLE0Zli83OyhZXOfG6MyJ0AzyNVkN6p7/491eR1J9b9/6xr1u4ICcz+5grHZkp6v0+A/IVz3a5RiCDO5b8PsAA==","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQDvak5wIM7dQnFhSO0BlW4M9DqTji6WM58YD4T17UW4xwIge07uStss0J6qQuGuzqWEwTBCvennREUEg/3vaHK/01Y="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"}],"_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_23.0.0-alpha.4_1522067501793_0.4253621525737654"},"_hasShrinkwrap":false},"23.0.0-alpha.5":{"name":"pretty-format","version":"23.0.0-alpha.5","repository":{"type":"git","url":"https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^3.0.0","ansi-styles":"^3.2.0"},"readmeFilename":"README.md","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n* Supports all built-in JavaScript types\n * primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`,\n `undefined`\n * other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n * collection types:\n * `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`,\n `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`,\n `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n * `Map`, `Set`, `WeakMap`, `WeakSet`\n * `Object`\n* [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n * similar performance to `JSON.stringify` in v8\n * significantly faster than `util.format` in Node.js\n* Serialize application-specific data types with built-in or user-defined\n plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the\noriginal `print` interface is a reason to use the improved `serialize`\ninterface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","_id":"pretty-format@23.0.0-alpha.5","dist":{"shasum":"49441032994ce2b1cfa74531c1c9d9a36fe59e90","tarball":"http://localhost:4260/pretty-format/pretty-format-23.0.0-alpha.5.tgz","fileCount":23,"unpackedSize":430762,"integrity":"sha512-F9gMQ7CurizcjuDminsbeqCLzGmi4/YKaTMfgcv8bNRKDv/Y18N7c+UVToSS/SJ3jwfBU5Dgze5o13yajhhhWw==","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCICK93Rks7NgBKqtZ/dn74PfJbkcOtLGOacpruGShpuf7AiAGJJWercND8+qsVSUsDYAzovjUfBbnnxEcbWowWu1fqg=="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"}],"_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_23.0.0-alpha.5_1523387900663_0.46189603391715317"},"_hasShrinkwrap":false},"23.0.0-alpha.5r":{"name":"pretty-format","version":"23.0.0-alpha.5r","repository":{"type":"git","url":"https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^3.0.0","ansi-styles":"^3.2.0"},"readmeFilename":"README.md","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n* Supports all built-in JavaScript types\n * primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`,\n `undefined`\n * other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n * collection types:\n * `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`,\n `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`,\n `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n * `Map`, `Set`, `WeakMap`, `WeakSet`\n * `Object`\n* [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n * similar performance to `JSON.stringify` in v8\n * significantly faster than `util.format` in Node.js\n* Serialize application-specific data types with built-in or user-defined\n plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the\noriginal `print` interface is a reason to use the improved `serialize`\ninterface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","_id":"pretty-format@23.0.0-alpha.5r","dist":{"shasum":"094d001344ba1857b19c6a943949b879f833202b","tarball":"http://localhost:4260/pretty-format/pretty-format-23.0.0-alpha.5r.tgz","fileCount":23,"unpackedSize":430763,"integrity":"sha512-nbUKjxi6W7/xuIsDaVRPd3hP81D7SOBYw2IWS89mtUoI/9J0KwKNwybhakiLibMyKcFB5wl9sqokiOt5xVZS/w==","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCICOfGQpBM2YPjF/de8M4rN7875YqKilUW/lS2/KJCJ46AiEAoF9fYREx5maulMancRqTje/YcHA/aOhW9VKHGWpHe3s="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"}],"_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_23.0.0-alpha.5r_1523425969823_0.716644474951514"},"_hasShrinkwrap":false},"23.0.0-alpha.6r":{"name":"pretty-format","version":"23.0.0-alpha.6r","repository":{"type":"git","url":"https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^3.0.0","ansi-styles":"^3.2.0"},"readmeFilename":"README.md","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n* Supports all built-in JavaScript types\n * primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`,\n `undefined`\n * other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n * collection types:\n * `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`,\n `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`,\n `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n * `Map`, `Set`, `WeakMap`, `WeakSet`\n * `Object`\n* [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n * similar performance to `JSON.stringify` in v8\n * significantly faster than `util.format` in Node.js\n* Serialize application-specific data types with built-in or user-defined\n plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the\noriginal `print` interface is a reason to use the improved `serialize`\ninterface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","_id":"pretty-format@23.0.0-alpha.6r","dist":{"shasum":"a50d8381a231f8ae231a8255d7e3de7a6c0d2fe5","tarball":"http://localhost:4260/pretty-format/pretty-format-23.0.0-alpha.6r.tgz","fileCount":23,"unpackedSize":430763,"integrity":"sha512-+qgVrXuk0Tsj4VTX+lJp2b2hqMMRfRGxevgrtAn2eiZBH5C5PEtWn3wJ/LxXPKdxy0Pavq1+t6LKblyGnRNbqw==","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQCoPdRV2ltvnFqnDY1N/G3MXiFhbr8QGx4GM0e+szZPFgIhAN9N6RYDzjxka5ZG73mFasSsJwh0nLO6CbjcN7Ns9GLT"}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"}],"_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_23.0.0-alpha.6r_1523516494617_0.22010912614011202"},"_hasShrinkwrap":false},"23.0.0-alpha.7":{"name":"pretty-format","version":"23.0.0-alpha.7","repository":{"type":"git","url":"https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^3.0.0","ansi-styles":"^3.2.0"},"readmeFilename":"README.md","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n* Supports all built-in JavaScript types\n * primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`,\n `undefined`\n * other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n * collection types:\n * `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`,\n `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`,\n `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n * `Map`, `Set`, `WeakMap`, `WeakSet`\n * `Object`\n* [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n * similar performance to `JSON.stringify` in v8\n * significantly faster than `util.format` in Node.js\n* Serialize application-specific data types with built-in or user-defined\n plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from\n[ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n* `ReactElement` for elements from `react`\n* `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of\nits built-in plugins. For this purpose, plugins are also known as **snapshot\nserializers**.\n\nTo serialize application-specific data types, you can add modules to\n`devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any\nmodules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They\nprecede built-in plugins for React, HTML, and Immutable.js data types. For\nexample, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)`\nmethod returns a truthy value, then `prettyFormat(val, options)` returns the\nresult from either:\n\n* `serialize(val, …)` method of the **improved** interface (available in\n **version 21** or later)\n* `print(val, …)` method of the **original** interface (if plugin does not have\n `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize\n**objects** which have certain properties, then a guarded expression like\n`val != null && …` or more concise `val && …` prevents the following errors:\n\n* `TypeError: Cannot read property 'whatever' of null`\n* `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* unchanging `config` object: derived from `options`\n* current `indentation` string: concatenate to `indent` from `config`\n* current `depth` number: compare to `maxDepth` from `config`\n* current `refs` array: find circular references in objects\n* `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in\n`options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n* `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n* `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is\n `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of\ncourse, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n* that **do not** depend on options other than `highlight` or `min`\n* that **do not** depend on `depth` or `refs` in recursive traversal, and\n* if values either\n * do **not** require indentation, or\n * do **not** occur as children of JavaScript data structures (for example,\n array)\n\nWrite `print` to return a string, given the arguments:\n\n* `val` which “passed the test”\n* current `printer(valChild)` callback function: serialize children\n* current `indenter(lines)` callback function: indent lines at the next level\n* unchanging `config` object: derived from `options`\n* unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n* `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n* `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is\n `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n* the key is the same (for example, `tag`)\n* the value in `colors` is a object with `open` and `close` properties whose\n values are escape codes from\n [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in\n `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding\nrest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"gitHead":"22f67d49ffcce7a5b6d6891438b837b3b26ba9db","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.0","_npmVersion":"5.6.0","_nodeVersion":"8.10.0","_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"dist":{"integrity":"sha512-qOtQFQVF+JoMhrMgeZnyobN0USkdRMjZFvodS4DCg1ltnR7q4JDnT6rt0tbaaknlOrdAgRNN2iwdjRAUHykU8Q==","shasum":"b7dde608501b681b8eaccf56522f93b97abad6cd","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.0.tgz","fileCount":17,"unpackedSize":387127,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nTwoH\r\n=4SxM\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQCBbUU3f7EXrs+RF9RtyMIgFiOvyaq78pRHfN0V7hh6+gIhAPVK7c6mmdkM9NTZnmW5+8GD3wGSIeCn/azommay/VZH"}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.0_1539951166013_0.3702080103625105"},"_hasShrinkwrap":false},"24.0.0-alpha.1":{"name":"pretty-format","version":"24.0.0-alpha.1","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"gitHead":"4954f46708415174c48a58f296a605fbe1244a31","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": 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Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"e41f0bb257c6652c3100b97a1087f9f812fbea0d","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.4","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-icvbBt3XlLEVqPHdHwR2Ou9+hezS9Eccd+mA+fXfOU7T9t7ClOpq2HgCwlyw+3WogccCubKWnmzyrA/3ZZ/aOA==","shasum":"cc1f7497e2496b71f8ad99f1526096e515fada03","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.4.tgz","fileCount":17,"unpackedSize":387166,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nF7Rx\r\n=NkyY\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIAvSFt80bV+IzHvMSXweyARFBQwmr3K04qwjZPUUKuQ0AiEAl2JCFPIRBjlD9Eh1QnVQ3JDJ+YHccBHCKA4ukdqCgRE="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.4_1540571595114_0.5456319880913951"},"_hasShrinkwrap":false},"24.0.0-alpha.5":{"name":"pretty-format","version":"24.0.0-alpha.5","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"2c18a53e8ff2437bba5fcb8076b754ac5f79f9f8","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.5","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-X8GIu0dnCsa5dXxuqLLBEiLLJyrP4qglGukZgwEEwpwPzbd9IL19/4KKbt39BZ4kG9viI8VNUwrUfl3mHlTD3w==","shasum":"7d55172dd88d5cc874353f2b60403f3a41e248fa","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.5.tgz","fileCount":17,"unpackedSize":387166,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nMvtL\r\n=y+nW\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIHYTzGRMocxKn3fYNmWYt4IPov4ddV9pXyM6c8OVzykRAiBvJhtK/wVFwizvRkJrXh2YK5sSliWM13f13YAt/+k80g=="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.5_1541769165697_0.919979009351394"},"_hasShrinkwrap":false},"24.0.0-alpha.6":{"name":"pretty-format","version":"24.0.0-alpha.6","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"49d08403a941e596eda1279c07a1eaf4d4a73dad","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.6","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-zG2m6YJeuzwBFqb5EIdmwYVf30sap+iMRuYNPytOccEXZMAJbPIFGKVJ/U0WjQegmnQbRo9CI7j6j3HtDaifiA==","shasum":"25ad2fa46b342d6278bf241c5d2114d4376fbac1","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.6.tgz","fileCount":17,"unpackedSize":387166,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nalON\r\n=Kf0G\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIGW8u/wYvh/GeEzZsk5N7hKHfcaeyMzn+Ea8OX7gkT9qAiEAmrWCMY3EdZIWs7u1jjYcW/cCPxChpyHymfwFgWTO5BA="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.6_1541785782719_0.07882660895723093"},"_hasShrinkwrap":false},"24.0.0-alpha.7":{"name":"pretty-format","version":"24.0.0-alpha.7","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"gitHead":"4954f46708415174c48a58f296a605fbe1244a31","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.7","_npmVersion":"5.6.0","_nodeVersion":"8.10.0","_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"dist":{"integrity":"sha512-tYRo6D7Ttgthp5vJHzmeVt0mNpqjjqHlNlPvtT6mN5jn15J80P/BRDd8Gg5ouuxR2iGw7qLFidN8L0vEuUasTA==","shasum":"c3f932635a38569921eac940b2217bb774ef4d18","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.7.tgz","fileCount":5,"unpackedSize":277728,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nOmKB\r\n=swOX\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIAZUU87xARnBnS03Y+xj9qSu43lMnKBh9e/o1B5UAuUFAiAaY173hkDjHw5/Q3LyNT0BVJx38jRN52olor6XxD5IfQ=="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.7_1544544476167_0.4371508942416136"},"_hasShrinkwrap":false},"24.0.0-alpha.8":{"name":"pretty-format","version":"24.0.0-alpha.8","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"^4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"700e0dadb85f5dc8ff5dac6c7e98956690049734","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.8","_npmVersion":"5.6.0","_nodeVersion":"8.10.0","_npmUser":{"name":"mjesun","email":"mjesun@hotmail.com"},"dist":{"integrity":"sha512-NmzgnwRiResqJsEHPXpKQuHHd47aKWe99zRHTsbRhfE5zd0xnyvMglAie2agF01xtJ+t6pLChtkm4cCxCd4RaA==","shasum":"522f73193f1e837850030068ecaecbe0b7f7d06c","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.8.tgz","fileCount":18,"unpackedSize":521842,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nx9wy\r\n=Pvjl\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIHhwV6VXXVibUDrjAs912WtluC70t8GH9L88Ji1PzDk1AiEAiijIxUpndf1ApNJJACrddGJdSsqKUsLvLnga8UxJE4w="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.8_1544730472585_0.11588537364178064"},"_hasShrinkwrap":false},"24.0.0-alpha.9":{"name":"pretty-format","version":"24.0.0-alpha.9","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"c7caa7ba5904d0c61e586694cde5f536639e4afc","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.9","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-FQTU33XZI4pRHb6JlLrgLEHyAA4sVWneyc8IbLq9s+VSpUEg3kEvOl5GutMbsP/lFVxXbWBkyhvGZKl3YWi6yA==","shasum":"d01a940d5c9a8bd38315f2dd3dc971df8547b172","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.9.tgz","fileCount":17,"unpackedSize":392262,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nHqJk\r\n=EjML\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQCwSSFbn7RCS5+uNaslZsMa0h6Yq++ULA9DmgUxUJK2zQIgfpFNNLyvvFXrSvOe6rgGQULmphlpOF4H6n2j8zrDkuc="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.9_1545229558375_0.622054766681222"},"_hasShrinkwrap":false},"24.0.0-alpha.10":{"name":"pretty-format","version":"24.0.0-alpha.10","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"722049ccd66947d48296dcb666bc99fccab86065","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.10","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-yIn+Bzkggxxboxhk655bjfI98x58fNk0NKllCjYVFZ1wmGWZ5G8w0Sfzt1pUKzFA2uFnOEccdX7+AB3IPZ9fzw==","shasum":"9e6b234714171b275148e36ad6524c8b6ab984b5","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.10.tgz","fileCount":17,"unpackedSize":392238,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n\r\nwsFcBAEBCAAQBQJcNimfCRA9TVsSAnZWagAAKY0QAJ54VHFjcYFQF/bfSdnB\npNQrWnn2iYm1sDQ2GjstIqaZKI502wUdfDBBbxJYUv2cDGgYpQBGZV873EsQ\nejks6Oi9vnfWzcA+IFZiLkGf8erA/XmKz1ivSzzqXESiMoRaabpR75ZJb1uG\ng8A0DFG517QvYklJ2aXv1Y50gSpm1MNJA48qi0eGvm0WMJex3oGdcHklMDpv\nrmxgSV4TrwkKxtU/T18OqArnHdQOKKPPhx9ysErS1hRDOiGoQR4J56I5j9+C\nGD2TmUkUyRQ3b1zJ3iMFX6cb632zO9eNO1lFcfaUllAiid7SqcyLIs0FD5d0\nvUkpSa8v50jBX6RRWz8q1eKSGchDCvx/xwZriq7X7yXK3ZLyic1f68l2zlXq\njO9fjkOfr9NZgXRGCgbj1FIiiJTsqBuVdzygrLma/tDePwrSs5XRirr3PA3/\nRT2wR9gOwXr+9vVmi6fR65P02YDJIzEDxHULaA8INIqXaOGkvdyrHv6Y4wH0\nQFpqctNskpKPm6hfSI+HD34sDJByYCzCF4pe7yP+7mptDICPP1zl3G1cK8wF\nMzmS/DC446P6bmWAc43Ru60VK0fUK2U/2WwQzL6ceGzt6Nac6SPQQ1dibot7\nO9bOTWNSio/cV7Z50BtTJxADa1Vcrt7OsckZVXy790j1HeleYLLoqvjzpFeC\ni/k3\r\n=XD2q\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQD3v3usg0BfM0Cf95trDPUSG8X5ObbKR7pt2ggwREQ18QIhAK91F7D42X4VfKlE7vB0sR1ubXVkaeTc0ZVlsBfptfhD"}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.10_1547053470936_0.439009740803185"},"_hasShrinkwrap":false},"24.0.0-alpha.11":{"name":"pretty-format","version":"24.0.0-alpha.11","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"6a066c6afe2ae08669a27d3b703a6cf0d898e7b7","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.11","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-dTLUCLYYV9RkULKbFg2U1WFsKkkarrdFtcvqirjf9EqEEC46rII8v98YlBckZk+XL7USsipKzWULuiySdQlp0A==","shasum":"5127d0bf9f712e3c9f5cc5df5ae4a2fc46dfacaa","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.11.tgz","fileCount":17,"unpackedSize":392022,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nFukj\r\n=Bm8G\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQDICpNB6RgJz9VNL3G2BIb6JXkRdOkgj2LqVBhz5kF8gQIgQPb0DoE7ZdmKaXEGSvPH4u2GmSHju3ALuTAf4GdXdMw="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.11_1547145307057_0.6328115400351251"},"_hasShrinkwrap":false},"24.0.0-alpha.12":{"name":"pretty-format","version":"24.0.0-alpha.12","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"4f2bcb861d1f0fb150c05970362e52a38c31f67e","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.12","_npmVersion":"5.6.0","_nodeVersion":"8.11.3","_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"dist":{"integrity":"sha512-M8gO614z38RgJSbOp6J8havxGPms+wen1oVtK6Es4/GS3coTO4mxY3660/qCaWG5Mj96nl9cgshMMfPqW8dPVg==","shasum":"eb3e3ccadbe7fe823bf5604de9e123abdf9b2d35","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.12.tgz","fileCount":17,"unpackedSize":392022,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nbVYn\r\n=J1sm\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIDmZ5RydDVyPK8MvMKp8tKRreKxkdgDL1oCCpQ1/zRVoAiBb6JN0aOp76Ne4m3jGWTqGID52pTvea8mN+aBL2Uhdxw=="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.12_1547218879190_0.3313568015150097"},"_hasShrinkwrap":false},"24.0.0-alpha.13":{"name":"pretty-format","version":"24.0.0-alpha.13","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"6de22dde9a10f775adc7b6f80080bdd224f6ae31","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@24.0.0-alpha.13","_nodeVersion":"8.11.3","_npmVersion":"lerna/3.10.5/node@v8.11.3+x64 (darwin)","dist":{"integrity":"sha512-4wJ9B0CCOtBlgZ//zI57cbOvaWA1iEfngae4gHRj7ibHrUTF59aFL6GE2QW8ppX5B3wGO/vFS7jR8Wo9gnRYng==","shasum":"f1bcbcbbfafd4cc1d4d871047d56f0fedbd030d6","tarball":"http://localhost:4260/pretty-format/pretty-format-24.0.0-alpha.13.tgz","fileCount":18,"unpackedSize":573400,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nUGj0\r\n=Pmif\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQC16Gukapf0NGdjnsp5fmaLkIiCf30Tkr42jGLQ24Dz9wIgYIUihEj760jJGnhel2bRENjF9THQrflV/1AngB67qLM="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"jean@lauliac.com","name":"jeanlauliac"},{"email":"mjesun@hotmail.com","name":"mjesun"},{"email":"rubennorte@gmail.com","name":"rubennorte"}],"_npmUser":{"name":"rubennorte","email":"rubennorte@gmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_24.0.0-alpha.13_1548256528812_0.6154443589171268"},"_hasShrinkwrap":false},"24.0.0-alpha.15":{"name":"pretty-format","version":"24.0.0-alpha.15","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"gitHead":"28971c5f794330e8acc6861288e6daafcd32238e","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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value.","main":"build/index.js","types":"build/index.d.ts","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^24.2.0-alpha.0","ansi-regex":"^4.0.0","ansi-styles":"^3.2.0"},"devDependencies":{"@types/ansi-regex":"^4.0.0","@types/ansi-styles":"^3.2.1","@types/react":"*","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 6"},"publishConfig":{"access":"public"},"gitHead":"800f2f803d01c8ae194d71b251e4965dd70e5bf2","readme":"# pretty-format\n\n> Stringify any JavaScript value.\n\n- Supports all built-in JavaScript types\n - primitive types: `Boolean`, `null`, `Number`, `String`, `Symbol`, `undefined`\n - other non-collection types: `Date`, `Error`, `Function`, `RegExp`\n - collection types:\n - `arguments`, `Array`, `ArrayBuffer`, `DataView`, `Float32Array`, `Float64Array`, `Int8Array`, `Int16Array`, `Int32Array`, `Uint8Array`, `Uint8ClampedArray`, `Uint16Array`, `Uint32Array`,\n - `Map`, `Set`, `WeakMap`, `WeakSet`\n - `Object`\n- [Blazingly fast](https://gist.github.com/thejameskyle/2b04ffe4941aafa8f970de077843a8fd)\n - similar performance to `JSON.stringify` in v8\n - significantly faster than `util.format` in Node.js\n- Serialize application-specific data types with built-in or user-defined plugins\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Of course, `pretty-format` does not need a plugin to serialize arrays :)\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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any JavaScript value.","main":"build/index.js","types":"build/index.d.ts","browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^25.2.0-alpha.86+cd98198c9","ansi-regex":"^5.0.0","ansi-styles":"^4.0.0","react-is":"^16.12.0"},"devDependencies":{"@types/react":"*","@types/react-is":"^16.7.1","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 8.3"},"publishConfig":{"access":"public"},"gitHead":"cd98198c9397d8b69c55155d7b224d62ef117a90","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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any JavaScript value.","main":"build/index.js","types":"build/index.d.ts","typesVersions":{"<3.8":{"*":["ts3.4/*"]}},"browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^25.2.1-alpha.1+5cc2ccdac","ansi-regex":"^5.0.0","ansi-styles":"^4.0.0","react-is":"^16.12.0"},"devDependencies":{"@types/react":"*","@types/react-is":"^16.7.1","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 8.3"},"publishConfig":{"access":"public"},"gitHead":"5cc2ccdacb1b2433581222252e43cb5a1f6861a9","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@25.2.1-alpha.1","_nodeVersion":"12.14.1","_npmVersion":"lerna/3.20.2/node@v12.14.1+x64 (darwin)","dist":{"integrity":"sha512-G9Qh1p3UW8FifOzD+IdpqS8fCrHcT6vPaGZCCDZh0HCmxRc0N4aFCvkB07mzZ9j/mkcdkvCxfNAcO18mxt6JCQ==","shasum":"7e8b60ad1aaa42e955f851c1ea54e0a5912cb07a","tarball":"http://localhost:4260/pretty-format/pretty-format-25.2.1-alpha.1.tgz","fileCount":53,"unpackedSize":376811,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nwuzV\r\n=3zfR\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIA2hWZEqG8dLFJAoCLL6j1a+/0HuLMV0Eugw4Jsrxz9PAiEAqcOwgs+tEAzRWsUwDdkDfnMZLEYOyj4K3l0RcZfNf5M="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"davidzilburg@gmail.com","name":"davidzilburg"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"rubennorte@gmail.com","name":"rubennorte"},{"email":"scott.hovestadt@gmail.com","name":"scotthovestadt"},{"email":"sbekkhus91@gmail.com","name":"simenb"}],"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_25.2.1-alpha.1_1585209261034_0.08136996983938283"},"_hasShrinkwrap":false},"25.2.1-alpha.2":{"name":"pretty-format","version":"25.2.1-alpha.2","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","types":"build/index.d.ts","typesVersions":{"<3.8":{"build/*":["build/ts3.4/*"]}},"browser":"build-es5/index.js","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^25.2.1-alpha.2+79b7ab67c","ansi-regex":"^5.0.0","ansi-styles":"^4.0.0","react-is":"^16.12.0"},"devDependencies":{"@types/react":"*","@types/react-is":"^16.7.1","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 8.3"},"publishConfig":{"access":"public"},"gitHead":"79b7ab67c63d3708f9689e25fbc0e8b0094bd019","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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= {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@26.0.0-alpha.1","_nodeVersion":"12.16.3","_npmVersion":"lerna/3.20.2/node@v12.16.3+x64 (darwin)","dist":{"integrity":"sha512-cmmphKwFlLnAkF5/qcIfVNxBBAcWqDwrHQkjpCTjzBn150tdXXNmt7DRjg2hPn9sSedURTW/0Hd85AFK6mJiyQ==","shasum":"e9349eca22cde5b973a441a524ab9506f93c5689","tarball":"http://localhost:4260/pretty-format/pretty-format-26.0.0-alpha.1.tgz","fileCount":27,"unpackedSize":66935,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\nCwTT\r\n=Tsvu\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIDyilyev1QDUdzSDzQhjRdeDbkFA6A2MGljlMwY452qkAiA+F/Ut72h5XCusbbNTFtl35s9Ih6CtZft33jUDZqf4Mw=="}]},"maintainers":[{"email":"aaron@abramov.io","name":"aaronabramov"},{"email":"christoph.pojer@gmail.com","name":"cpojer"},{"email":"davidzilburg@gmail.com","name":"davidzilburg"},{"email":"opensource+npm@fb.com","name":"fb"},{"email":"rubennorte@gmail.com","name":"rubennorte"},{"email":"scott.hovestadt@gmail.com","name":"scotthovestadt"},{"email":"sbekkhus91@gmail.com","name":"simenb"}],"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_26.0.0-alpha.1_1588531681337_0.22206005318311317"},"_hasShrinkwrap":false},"26.0.0-alpha.2":{"name":"pretty-format","version":"26.0.0-alpha.2","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"build/index.js","types":"build/index.d.ts","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^26.0.0-alpha.2","ansi-regex":"^5.0.0","ansi-styles":"^4.0.0","react-is":"^16.12.0"},"devDependencies":{"@types/react":"*","@types/react-is":"^16.7.1","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^25.2.6","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 10.14.2"},"publishConfig":{"access":"public"},"gitHead":"68b65afc97688bd5b0b433f8f585da57dcd1d418","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@26.0.0-alpha.2","_nodeVersion":"12.16.3","_npmVersion":"lerna/3.20.2/node@v12.16.3+x64 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any JavaScript value.","main":"build/index.js","types":"build/index.d.ts","author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^26.0.1-alpha.0","ansi-regex":"^5.0.0","ansi-styles":"^4.0.0","react-is":"^16.12.0"},"devDependencies":{"@types/react":"*","@types/react-is":"^16.7.1","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^25.2.6","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":">= 10.14.2"},"publishConfig":{"access":"public"},"gitHead":"fb04716adb223ce2da1e6bb2b4ce7c011bad1807","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst prettyFormat = require('pretty-format'); // CommonJS\n```\n\n```js\nimport prettyFormat from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst prettyFormat = require('pretty-format');\nconst ReactElement = prettyFormat.plugins.ReactElement;\nconst ReactTestComponent = prettyFormat.plugins.ReactTestComponent;\n\nconst React = require('react');\nconst renderer = require('react-test-renderer');\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport prettyFormat from 'pretty-format';\nconst {ReactElement, ReactTestComponent} = prettyFormat.plugins;\n\nimport React from 'react';\nimport renderer from 'react-test-renderer';\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@26.0.1-alpha.0","_nodeVersion":"12.16.3","_npmVersion":"lerna/3.20.2/node@v12.16.3+x64 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require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.0","_nodeVersion":"14.15.0","_npmVersion":"lerna/3.22.1/node@v14.15.0+x64 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require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.3","_nodeVersion":"14.15.3","_npmVersion":"lerna/3.22.1/node@v14.15.3+x64 (darwin)","dist":{"integrity":"sha512-5JppAL3xa3VIsOsaAdqemtAtUFTq4YeooksqZOKZxQwTYXlPF2+t1fo/QFhCjfRucG61YE+9dcBTQ0U6wAG9qw==","shasum":"1dab8c1e36ca9266a8b91a3b2aab0e6c1223bd96","tarball":"http://localhost:4260/pretty-format/pretty-format-27.0.0-next.3.tgz","fileCount":27,"unpackedSize":67296,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nJYAd\r\n=OWXL\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQDZBhYN1Rp820khIu7feZyc1Y7dgUoEpSfVmFMqDLaeOQIgYX6rq+wUim00bURJKAKlqwQNlXbgULiEWztv6erapdU="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"cpojer","email":"christoph.pojer@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_27.0.0-next.3_1613686188495_0.5727726322376101"},"_hasShrinkwrap":false},"27.0.0-next.5":{"name":"pretty-format","version":"27.0.0-next.5","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":"./build/index.js","./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^27.0.0-next.3","ansi-regex":"^5.0.0","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^27.0.0-next.3","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"},"publishConfig":{"access":"public"},"gitHead":"0a2b94282170b6d4cc26c2d2003cc04ffebe5e3f","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.5","_nodeVersion":"14.15.3","_npmVersion":"lerna/4.0.0/node@v14.15.3+x64 (darwin)","dist":{"integrity":"sha512-SWcA9i7ST3JETWEpcxOf+qDQVsd0ScmlNTR2mduK2YFcqwdYnlyrUhmzwExK0dFXE6575Hmmu4no6WazhN+ILw==","shasum":"9d5c606645bee6149354fc4fcefb27899b51aedf","tarball":"http://localhost:4260/pretty-format/pretty-format-27.0.0-next.5.tgz","fileCount":27,"unpackedSize":67408,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\n1WDF\r\n=nqdA\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIFSf8rzCqKnb1fIQdAGUZ/OMhLHyWryDKXdtaax655qjAiBgSo6xxHObO2sHDbwxjfgen0Q978Ta9g65EjZdN8nbmA=="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"cpojer","email":"christoph.pojer@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_27.0.0-next.5_1615813397108_0.859500618184837"},"_hasShrinkwrap":false},"27.0.0-next.6":{"name":"pretty-format","version":"27.0.0-next.6","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":"./build/index.js","./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^27.0.0-next.3","ansi-regex":"^5.0.0","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^27.0.0-next.6","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"},"publishConfig":{"access":"public"},"gitHead":"974d2f22b7deeb4f683fb38dd1ee3a0e984916df","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.6","_nodeVersion":"14.15.3","_npmVersion":"lerna/4.0.0/node@v14.15.3+x64 (darwin)","dist":{"integrity":"sha512-HdKjeRnHKAd+DS3An7N1uMwIu+xRsqYeMJINuWbGMu00Jvz2O+7CqCuIXef/N3ZbTdu36NUoGckN7W5/zTfFmw==","shasum":"939db422c273e8537c9b12d5146ccefdef5cccf5","tarball":"http://localhost:4260/pretty-format/pretty-format-27.0.0-next.6.tgz","fileCount":27,"unpackedSize":67408,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nQ2UZ\r\n=0lzf\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQDxEcnkO0Bp4BDSkFN4Z6ivmXXCJPKsC6Kx/NGXRRrw+QIgVJwIUdnZqHk3ByZf9bEMuwtZB//puUSgS972xUb7txY="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"cpojer","email":"christoph.pojer@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_27.0.0-next.6_1616701197091_0.4323549634272008"},"_hasShrinkwrap":false},"27.0.0-next.7":{"name":"pretty-format","version":"27.0.0-next.7","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":"./build/index.js","./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^27.0.0-next.7","ansi-regex":"^5.0.0","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^27.0.0-next.7","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"},"publishConfig":{"access":"public"},"gitHead":"28c763e6be8f57bda89238b95dc801460c2d6601","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.7","_nodeVersion":"14.15.3","_npmVersion":"lerna/4.0.0/node@v14.15.3+x64 (darwin)","dist":{"integrity":"sha512-EIZkBDWdmTBGTBmvvVBn/CST1fnESlojElgry2GTOBxFs7fbIIeyf5tb46yqIwJjiPg0oRqIExOBGGWgPw+qRA==","shasum":"48fcf4058857114c6326410894ad39ac97e84555","tarball":"http://localhost:4260/pretty-format/pretty-format-27.0.0-next.7.tgz","fileCount":27,"unpackedSize":67408,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nVOa/\r\n=Oh5U\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQDfeqLe98de1tw+NBOYXth1Vjgz5zHlVIutRic9uzOYCgIhANzxFt5JOs5T49EjTt/sTxJnM0nHz+tUKDMX01mob9L0"}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"cpojer","email":"christoph.pojer@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_27.0.0-next.7_1617371273959_0.7513344253300966"},"_hasShrinkwrap":false},"27.0.0-next.8":{"name":"pretty-format","version":"27.0.0-next.8","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":"./build/index.js","./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^27.0.0-next.8","ansi-regex":"^5.0.0","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^27.0.0-next.8","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"},"publishConfig":{"access":"public"},"gitHead":"d7ba5030e274b52f029179dfdb860349a36eea37","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.8","_nodeVersion":"14.15.3","_npmVersion":"lerna/4.0.0/node@v14.15.3+x64 (darwin)","dist":{"integrity":"sha512-Y7Pd+USoRKghYi+dj2RCikTK36AlDO2bMH5sRGMr3fW1l/vVp2Vht2tjVhXvC5T6+yMH2ivtpfI6+99/Igr+6Q==","shasum":"4dc6c34580949180a40c38957ac5e92693f10f2e","tarball":"http://localhost:4260/pretty-format/pretty-format-27.0.0-next.8.tgz","fileCount":27,"unpackedSize":67408,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nCikc\r\n=d54p\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQCTGF1YoPHBFuWc905y8ytC4/iy8HQLFEDEJIo5bG1SQgIhALfXfYJzh4AUqaPtxMf+TDyUjzIKKv2vZU2/OUF3LTIr"}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_27.0.0-next.8_1618267349142_0.02346708839333833"},"_hasShrinkwrap":false},"27.0.0-next.9":{"name":"pretty-format","version":"27.0.0-next.9","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":"./build/index.js","./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^27.0.0-next.8","ansi-regex":"^5.0.0","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^27.0.0-next.9","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"},"publishConfig":{"access":"public"},"gitHead":"d836f33f98845794b4eae8149548a81ddcfc6521","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@27.0.0-next.9","_nodeVersion":"14.16.1","_npmVersion":"lerna/4.0.0/node@v14.16.1+x64 (darwin)","dist":{"integrity":"sha512-BF2889sl/4yxeInR4tYnJQu6IOKNjZdujqcLaMoQUd1G9CykEBrpCuT6a86Q8iKXyaJMq2MMCfTPHe4TjAwbhA==","shasum":"37272be62520236a17e77038d1c9dd15a6e695ad","tarball":"http://localhost:4260/pretty-format/pretty-format-27.0.0-next.9.tgz","fileCount":27,"unpackedSize":67450,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\n9P+v\r\n=CDYs\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQD4cC93vGRj+HgsqtQdqkSnbXCeBnFVZsOSv7+7UPYaEQIgFJKEPVL0m4Nv/UHzo89PSF0dsXtldheI31UlfK37u2o="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_27.0.0-next.9_1620109501875_0.5944508303070835"},"_hasShrinkwrap":false},"27.0.0-next.10":{"name":"pretty-format","version":"27.0.0-next.10","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":"./build/index.js","./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/types":"^27.0.0-next.10","ansi-regex":"^5.0.0","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"4.0.0-rc.9","jest-util":"^27.0.0-next.10","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"},"publishConfig":{"access":"public"},"gitHead":"6f44529270310b7dbdf9a0b72b21b5cd50fda4b1","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :------------------ | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.0","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-/rjXgM4uOoEGOFIXb9LqDasX6SgxDatU93OFwd8/u/+Ypxe5V8jKvTlEwvDiQ4b7qZr97MolX7wVHKax6pUQoQ==","shasum":"1436aa165d4ce8bf90abb42f8d3f77b498a16d58","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.0.tgz","fileCount":16,"unpackedSize":63659,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nnjXr\r\n=j8SS\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQC2rjAMWcQD3UPYzGqrp+uaqbr2NMCPslZIZZ2TE26dOgIgP9hamkN/4mQMoeeIvEKTFUCzxueIxVrUNXnTQcGHd3o="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.0_1644517047209_0.9110405280838838"},"_hasShrinkwrap":false},"28.0.0-alpha.1":{"name":"pretty-format","version":"28.0.0-alpha.1","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.1","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.1","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"d30164dde1847166fa0faec98d20abffd85e6ffd","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.1","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-QhGbrWAhSSEBHqdUj2pAy9MuR4QLBhLfCUENh+bhOWO0tcbqgNSvnbfLUkMroAcFUZIEzBwiOxxngKS2rHvWgA==","shasum":"3a87ad1585b52dd3c314b35badf99e1bdf823bb9","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.1.tgz","fileCount":16,"unpackedSize":63251,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nl8Ec\r\n=o9Xz\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIBC8p1pxhPymqyFymaYozjt8sYFeIewGFM9RkRS1481/AiEAt6Drsn5L14VDmY1ojktjbAs0suGG25xdzBDZmp90lS0="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.1_1644960414110_0.8406425425879609"},"_hasShrinkwrap":false},"28.0.0-alpha.2":{"name":"pretty-format","version":"28.0.0-alpha.2","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.2","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.2","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"694d6bfea56f9cb49d0c7309cdbfff032da198c2","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.2","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-X7v9c9KuJJhH7Ue7a/grXlLzrpUzjdHCgf8lbbg/r+sX6syzUPLTKdiyxQGFhAYttZPRwmzRC/kVY50f97aDmg==","shasum":"e89a8b3d77b6e5bc1cb9a57fcb68089fbc96cee7","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.2.tgz","fileCount":16,"unpackedSize":65283,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.13\r\nComment: https://openpgpjs.org\r\n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\nNarA\r\n=6NeP\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCICwqTj1ggB0djmgR8aY32yZn8Gnf+4xmvUiAe9Og2+TrAiA1bGo2PV55lJ52miG3BaTLJDwbe2R6fBNdhjbK4/Pq2Q=="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.2_1645035120150_0.4279390848744169"},"_hasShrinkwrap":false},"28.0.0-alpha.3":{"name":"pretty-format","version":"28.0.0-alpha.3","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.3","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.3","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"fc30b27bd94bb7ebeaadc72626ebbdba535150d2","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `strong` | spacing to separate items in a list |\n| `spacingOuter` | `strong` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.3","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-NEv1CczT6FETvnXhKZhSmBhqNTFSqzR0wThFQYrsPCo5Nh23MAV6tJcg8e4v3EufEYdNmg054tDrqjBSPtrb5A==","shasum":"3640879f93293f2c36f804ed9a0cf4558b9de72a","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.3.tgz","fileCount":16,"unpackedSize":65283,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\n8uS9/DUaE+33WbOlWx8/rSVsI60R0c5qJfE=\r\n=zA88\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQDdeLv9CpBOJb4wiU9J+3X/ShP+nhhprdxvgyigHcoaUQIgOOxMXLUZnl2+2HbHTDu9/U5Ibji0wSEYtIhVL5/m+hk="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.3_1645112541087_0.8638536537967649"},"_hasShrinkwrap":false},"28.0.0-alpha.4":{"name":"pretty-format","version":"28.0.0-alpha.4","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.3","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.4","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"c13dab19491ba6b57c2d703e7d7c4b20189e1e17","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.4","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-Fef3SvIqeOUBDiZST9Krl8phvyjD4OJsKafX8P7f+KoC8ofwTX5fIx/1dArAaSwR2b/P3tVBzmNowtS7vqdhXg==","shasum":"18037743f425769734e6d6cb81742d1be50cf8cb","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.4.tgz","fileCount":26,"unpackedSize":70679,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\nFqPgCatFsh29FrXJWP16+ZURgr9H+ll7hjo=\r\n=Ua3d\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIFojIviEnTG66LyoKURrF46nlQfwoqlWTzPUEizH+h1pAiEA2qpEon7ND6TTDR29hXvnTnXZUhUe8xBf3V/uQ1v16Ks="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.4_1645532034396_0.6724369004713402"},"_hasShrinkwrap":false},"28.0.0-alpha.5":{"name":"pretty-format","version":"28.0.0-alpha.5","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.3","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.5","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"46fb19b2628bd87676c10730ba19592c30b05478","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? '[' + name + ']'\n : (config.min ? '' : name + ' ') +\n '[' +\n serializeItems(array, config, indentation, depth, refs, printer) +\n ']';\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.5","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-188xlJdjYl6YAeMLBoBaI0WfcN/+dqpsOPM4gVewrm7JJ9gqu2lCbQ8e9GVIbu6vsJCKXJujBfqA2Tpb0GWk0Q==","shasum":"4de87bceb13bcddda77d1ba8b37bd270f3c6f389","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.5.tgz","fileCount":16,"unpackedSize":64632,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\nmoveg2sV5f6/LbGNexW8OGUSQ4fNioRpKCE=\r\n=Jl9d\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQC+xqTboCojbx0+ArJz1lvGuZfAToFQ7B2z8oTnUrqiSQIhAICIEmVfuh5w6G4T5b6s5g79x8cH/I3CWTDlPyr/yhWA"}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.5_1645736237951_0.49014202807759455"},"_hasShrinkwrap":false},"28.0.0-alpha.6":{"name":"pretty-format","version":"28.0.0-alpha.6","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.3","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.6","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"6284ada4adb7008f5f8673b1a7b1c789d2e508fb","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.6","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-ZpWa20EGIu2DWS+jAmELiGAVrfECoNooq/DdeZdvPY8T+UNsqwu/UY4t/SLZ/1wM3p16Hunb1jY/BrTsgGndfA==","shasum":"200d65bb7e118ce3fbee6b8955065837ca0b51c9","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.6.tgz","fileCount":16,"unpackedSize":63893,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\nrPciAUvF5CYUnEUQMmfQm7LR5nWokfGV21A=\r\n=Kcz/\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIA7UUzF1qzeVY8Kbrql0MShYoXd78iWrUd4mDtMmUN3HAiAvf1/6d1B5/f/KobA89NAJmpSAjTJR9P3vnNr7sNVbbg=="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.6_1646123543138_0.36579205309415164"},"_hasShrinkwrap":false},"28.0.0-alpha.7":{"name":"pretty-format","version":"28.0.0-alpha.7","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.3","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.7","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"06f58f8ca70abc9c09d554967935b58ce85c48d6","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@28.0.0-alpha.7","_nodeVersion":"16.14.0","_npmVersion":"lerna/4.0.0/node@v16.14.0+x64 (darwin)","dist":{"integrity":"sha512-al2ExJ2p1yP7UVgwpVd/RJf0sFvBywxkPftrUIwkbgCQTLc7hWJ/BGseoGBpAIskQoagG2ZrZfVgSc05zhJSvg==","shasum":"0a570dd71fc8286669e733e3aaf834482f6889d4","tarball":"http://localhost:4260/pretty-format/pretty-format-28.0.0-alpha.7.tgz","fileCount":16,"unpackedSize":63893,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n\r\nwsFzBAEBCAAGBQJiJIa/ACEJED1NWxICdlZqFiEECWMYAoorWMhJKdjhPU1b\r\nEgJ2VmrHWw//dkZt3WHgfCh3M0YVf60oCK4EcR5xRbg8wK7CGzzCRigTba7h\r\n0bYnUX7xvl+2S27H6mQMHWi1585YW34XlM5khOm0yk8BQlqDR5xlNnvFNqzP\r\nITipzzMW1auvloS7O32y9JmDqQB7BQoGIhp/kEcflVDq/P3EsvIBBfb6RKjj\r\ng+Rl6FYSaF91o6sg+ofKJAp7EgOyo+8tqLX9c6NNt76Wx/fxTbpYETc7lAtT\r\nkEC0+B24lhWQ53f6ftby69ijcqJVNcVKbNzH1QgxocU8xLPZYlbIBYAz7gIj\r\nbCGgb1xuXpd3dU8IzerQsPlQZQ8UZdN6V0OY1quoHy+lUvV5fdkaV5getTNA\r\nAghsBf0SHxg3GQKC85s0RQ02kKT/eGtwzu12KcUA/pm8l102S8DK2JkLivcQ\r\n10rTc8S6ue3JdyYBJX53lZ1/onGmJknR7B5kKLVrbj+p4Q/dlxEty5WPZujK\r\nkLDCMLEK4yeKbaWCsS0LwZKPP9db76gNk1RMRUxSJpeg9C6AVLmR4JyRbo3o\r\nN9FgR1XqcWAZuOPUFpFetaGsU9FbmFEUi70bCVomaK36QB0KYx4J8w8laJ+/\r\nSHOMYB7hnTC92Fo8c9zD98fXlvVRFG8Wt1e1I+au54zgYiniA90lqGggSd2N\r\nxrULAiovDWhzUyr2YZKjpYThCVqcAZxhcec=\r\n=rPPY\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIF2/Vbsq4Sl7PbL+ceOR3fZLGMjPSMEsOInGNtpgLDEzAiEA3+wIa8HeG2mPr7rM5VX8ZQellxjrGwSDD0JX1+o8AbQ="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_28.0.0-alpha.7_1646560959672_0.2511284546495116"},"_hasShrinkwrap":false},"28.0.0-alpha.8":{"name":"pretty-format","version":"28.0.0-alpha.8","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json","./ConvertAnsi":"./build/plugins/ConvertAnsi.js"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^28.0.0-alpha.3","ansi-regex":"^5.0.1","ansi-styles":"^5.0.0","react-is":"^17.0.1"},"devDependencies":{"@types/react":"*","@types/react-is":"^17.0.0","@types/react-test-renderer":"*","immutable":"^4.0.0","jest-util":"^28.0.0-alpha.8","react":"*","react-dom":"*","react-test-renderer":"*"},"engines":{"node":"^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"},"publishConfig":{"access":"public"},"gitHead":"d915e7df92b220dbe6e124585ba6459838a6c41c","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@29.0.0-alpha.0","_nodeVersion":"16.15.1","_npmVersion":"lerna/4.0.0/node@v16.15.1+x64 (darwin)","dist":{"integrity":"sha512-jJty30gRCVJwXpdphPaKXkc9bl87jFxbt0ozgsV7Kp5cV+2YF+5ZfIPne+s0WI80JYXta2qzdQeeoTLrVRoAGg==","shasum":"934f5469a2641c2212034e7e26f43784a8ee3a20","tarball":"http://localhost:4260/pretty-format/pretty-format-29.0.0-alpha.0.tgz","fileCount":16,"unpackedSize":61546,"signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCICCLR0N8CjGxhCgsEpYlIXAZg/IkuGntnXYUGB5PsisCAiEAiiX9LEAi6ByuCrXOwN+lQbRWsbs4akm4b4/I7KYY1gs="}],"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\nKW9a0MHeycEQhch3LN1/9M/dos7LpmUQV+E=\r\n=XnCo\r\n-----END PGP SIGNATURE-----\r\n"},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_29.0.0-alpha.0_1658095626813_0.7693977634747002"},"_hasShrinkwrap":false},"29.0.0-alpha.1":{"name":"pretty-format","version":"29.0.0-alpha.1","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^29.0.0-alpha.0","ansi-styles":"^5.0.0","react-is":"^18.0.0"},"devDependencies":{"@types/react":"^17.0.3","@types/react-is":"^17.0.0","@types/react-test-renderer":"17.0.2","expect":"^29.0.0-alpha.1","immutable":"^4.0.0","jest-util":"^29.0.0-alpha.0","react":"17.0.2","react-dom":"^17.0.1","react-test-renderer":"17.0.2"},"engines":{"node":"^14.15.0 || ^16.10.0 || >=18.0.0"},"publishConfig":{"access":"public"},"gitHead":"10f1e7f52d9f876e6fb7f20c1903fdcddd8db8b1","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@29.0.0-alpha.1","_nodeVersion":"16.15.1","_npmVersion":"lerna/4.0.0/node@v16.15.1+x64 (darwin)","dist":{"integrity":"sha512-KDMbK6D5xr3jmk8DRQzGzKqFt+5D89zIAYlEUuReet9KznB342p/EC/G7+1u2eOBfIpaeiMNqGU5LSgfSAjRmw==","shasum":"0983500df3b2f43432d92609cdb756e2aa16ffbf","tarball":"http://localhost:4260/pretty-format/pretty-format-29.0.0-alpha.1.tgz","fileCount":15,"unpackedSize":58727,"signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIDejR0uooPv/qQJaxsmYJndBGU0IUxF7YmG2dUrNOYV1AiAgZ+iS2fTqBACeRM6nzGqg3e66WKRH2HJWSALU5jTkuQ=="}],"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\noyp2mgjRAYygsdbvje66kMDvp4QVCzpXFrU=\r\n=ujFi\r\n-----END PGP SIGNATURE-----\r\n"},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_29.0.0-alpha.1_1659601408591_0.6820707347770099"},"_hasShrinkwrap":false},"29.0.0-alpha.3":{"name":"pretty-format","version":"29.0.0-alpha.3","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^29.0.0-alpha.3","ansi-styles":"^5.0.0","react-is":"^18.0.0"},"devDependencies":{"@types/react":"^17.0.3","@types/react-is":"^17.0.0","@types/react-test-renderer":"17.0.2","expect":"^29.0.0-alpha.3","immutable":"^4.0.0","jest-util":"^29.0.0-alpha.3","react":"17.0.2","react-dom":"^17.0.1","react-test-renderer":"17.0.2"},"engines":{"node":"^14.15.0 || ^16.10.0 || >=18.0.0"},"publishConfig":{"access":"public"},"gitHead":"09981873c55442e5e494d42012f518b7d3d41fbd","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/facebook/jest/issues"},"homepage":"https://github.com/facebook/jest#readme","_id":"pretty-format@29.0.0-alpha.3","_nodeVersion":"16.15.1","_npmVersion":"lerna/1.10.0/node@v16.15.1+x64 (darwin)","dist":{"integrity":"sha512-Sbr8fLVdpbjQF37YqOiyn0XdpLKkPe3PiMfxAxKRXhiAQUV33IhvnyWrRwdt3VYVguu0UHcloDRaE3C70LJM5w==","shasum":"d09e7d8738f4503f5454d4ac7649cca8717ae7c3","tarball":"http://localhost:4260/pretty-format/pretty-format-29.0.0-alpha.3.tgz","fileCount":15,"unpackedSize":58727,"signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQCpDn7ftSNY21obI7FhViZMIMRQeQ1RweOgFkVj9zg1SgIgSXmrehrB93XRVcbfpx/nFoAcbsycaVVItglvOc/CcKc="}],"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v4.10.10\r\nComment: https://openpgpjs.org\r\n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\r\nLDbl4/4JgZnc3LxOEq9Tz6fuBTTC5F70hU8=\r\n=ggwb\r\n-----END PGP SIGNATURE-----\r\n"},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"scotthovestadt","email":"scott.hovestadt@gmail.com"},{"name":"rubennorte","email":"rubennorte@gmail.com"},{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"fb","email":"opensource+npm@fb.com"},{"name":"aaronabramov","email":"aaron@abramov.io"},{"name":"davidzilburg","email":"davidzilburg@gmail.com"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_29.0.0-alpha.3_1659879696286_0.7638393311736449"},"_hasShrinkwrap":false},"29.0.0-alpha.4":{"name":"pretty-format","version":"29.0.0-alpha.4","repository":{"type":"git","url":"git+https://github.com/facebook/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","default":"./build/index.js"},"./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"^29.0.0-alpha.3","ansi-styles":"^5.0.0","react-is":"^18.0.0"},"devDependencies":{"@types/react":"^17.0.3","@types/react-is":"^17.0.0","@types/react-test-renderer":"17.0.2","expect":"^29.0.0-alpha.4","immutable":"^4.0.0","jest-util":"^29.0.0-alpha.4","react":"17.0.2","react-dom":"^17.0.1","react-test-renderer":"17.0.2"},"engines":{"node":"^14.15.0 || ^16.10.0 || >=18.0.0"},"publishConfig":{"access":"public"},"gitHead":"98a833bd4bc0bdcfcee5d4f04c2833400c4e2933","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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// CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :-------- | :--------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| `undefined`| compare function used when sorting object keys |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :-------- | :------------------------------------------------------ |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function`| compare function used when sorting object keys |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. 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add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :--------------- | :---------- | :-------------------------------------------------------------------------------------- |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function\\|null` | `undefined` | compare function used when sorting object keys, `null` can be used to skip over sorting |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :--------------- | :-------------------------------------------------------------------------------------- |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function\\|null` | compare function used when sorting object keys, `null` can be used to skip over sorting |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/jestjs/jest/issues"},"homepage":"https://github.com/jestjs/jest#readme","_id":"pretty-format@30.0.0-alpha.1","_nodeVersion":"20.9.0","_npmVersion":"lerna/1.13.0/node@v20.9.0+arm64 (darwin)","dist":{"integrity":"sha512-V56m4hqT/PwVCxyuNDUVZlCiYgP5KhN2vRl0DLnILQ7O0BvS/t3wXaZ9UX+TZhYesdq7ROHMiMO9JySieoDBXQ==","shasum":"ce4eb0a89959c3bcfd5d590acf90666ba5a92f31","tarball":"http://localhost:4260/pretty-format/pretty-format-30.0.0-alpha.1.tgz","fileCount":6,"unpackedSize":60189,"signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEQCIHko+iYZZKh9AaLB6LLKflvJCu1suw1WIIzBHIzV//zLAiAEieUtPHU0E/WKhCEJjuzn19EJycYX71cfQfOWR0m9bg=="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"cpojer","email":"christoph.pojer@gmail.com"},{"name":"aaronabramov","email":"aaron@abramov.io"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_30.0.0-alpha.1_1698672788870_0.7112117761424848"},"_hasShrinkwrap":false},"30.0.0-alpha.2":{"name":"pretty-format","version":"30.0.0-alpha.2","repository":{"type":"git","url":"git+https://github.com/jestjs/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","require":"./build/index.js","import":"./build/index.mjs","default":"./build/index.js"},"./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"30.0.0-alpha.2","ansi-styles":"^5.0.0","react-is":"^18.0.0"},"devDependencies":{"@types/react":"^18.2.0","@types/react-is":"^18.0.0","@types/react-test-renderer":"^18.0.1","immutable":"^4.0.0","jest-util":"30.0.0-alpha.2","react":"18.2.0","react-dom":"18.2.0","react-test-renderer":"18.2.0"},"engines":{"node":"^16.10.0 || ^18.12.0 || >=20.0.0"},"publishConfig":{"access":"public"},"gitHead":"c04d13d7abd22e47b0997f6027886aed225c9ce4","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :--------------- | :---------- | :-------------------------------------------------------------------------------------- |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function\\|null` | `undefined` | compare function used when sorting object keys, `null` can be used to skip over sorting |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :--------------- | :-------------------------------------------------------------------------------------- |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function\\|null` | compare function used when sorting object keys, `null` can be used to skip over sorting |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/jestjs/jest/issues"},"homepage":"https://github.com/jestjs/jest#readme","_id":"pretty-format@30.0.0-alpha.2","_nodeVersion":"20.9.0","_npmVersion":"lerna/2.7.0/node@v20.9.0+arm64 (darwin)","dist":{"integrity":"sha512-9preHaHWIBEtQOkuN0vpCgfTo8X3vlWmDdCQHA1hSJ5vKNA1EGFr7iEQZDFLdqYe6DeJChdBqi+A+VFV98QGXQ==","shasum":"f69024bc3cc0398fa4d86a9b44c32028006e94ea","tarball":"http://localhost:4260/pretty-format/pretty-format-30.0.0-alpha.2.tgz","fileCount":6,"unpackedSize":60190,"signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQC6m5A7+RlxrEoVJm0p6UjOJkzHz+qCvWQNfmwMYUt8+gIgBLMNC4Gs26NS5bcJnM5dKnJTDjDzJNSOwHcjkCJl42U="}]},"_npmUser":{"name":"simenb","email":"sbekkhus91@gmail.com"},"directories":{},"maintainers":[{"name":"simenb","email":"sbekkhus91@gmail.com"},{"name":"cpojer","email":"christoph.pojer@gmail.com"},{"name":"aaronabramov","email":"aaron@abramov.io"}],"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/pretty-format_30.0.0-alpha.2_1700126899059_0.350975848984892"},"_hasShrinkwrap":false},"30.0.0-alpha.3":{"name":"pretty-format","version":"30.0.0-alpha.3","repository":{"type":"git","url":"git+https://github.com/jestjs/jest.git","directory":"packages/pretty-format"},"license":"MIT","description":"Stringify any JavaScript value.","main":"./build/index.js","types":"./build/index.d.ts","exports":{".":{"types":"./build/index.d.ts","require":"./build/index.js","import":"./build/index.mjs","default":"./build/index.js"},"./package.json":"./package.json"},"author":{"name":"James Kyle","email":"me@thejameskyle.com"},"dependencies":{"@jest/schemas":"30.0.0-alpha.3","ansi-styles":"^5.0.0","react-is":"^18.0.0"},"devDependencies":{"@types/react":"^18.2.0","@types/react-is":"^18.0.0","@types/react-test-renderer":"^18.0.1","immutable":"^4.0.0","jest-util":"30.0.0-alpha.3","react":"18.2.0","react-dom":"18.2.0","react-test-renderer":"18.2.0"},"engines":{"node":"^16.10.0 || ^18.12.0 || >=20.0.0"},"publishConfig":{"access":"public"},"gitHead":"e267aff33d105399f2134bad7c8f82285104f3da","readme":"# pretty-format\n\nStringify any JavaScript value.\n\n- Serialize built-in JavaScript types.\n- Serialize application-specific data types with built-in or user-defined plugins.\n\n## Installation\n\n```sh\n$ yarn add pretty-format\n```\n\n## Usage\n\n```js\nconst {format: prettyFormat} = require('pretty-format'); // CommonJS\n```\n\n```js\nimport {format as prettyFormat} from 'pretty-format'; // ES2015 modules\n```\n\n```js\nconst val = {object: {}};\nval.circularReference = val;\nval[Symbol('foo')] = 'foo';\nval.map = new Map([['prop', 'value']]);\nval.array = [-0, Infinity, NaN];\n\nconsole.log(prettyFormat(val));\n/*\nObject {\n \"array\": Array [\n -0,\n Infinity,\n NaN,\n ],\n \"circularReference\": [Circular],\n \"map\": Map {\n \"prop\" => \"value\",\n },\n \"object\": Object {},\n Symbol(foo): \"foo\",\n}\n*/\n```\n\n## Usage with options\n\n```js\nfunction onClick() {}\n\nconsole.log(prettyFormat(onClick));\n/*\n[Function onClick]\n*/\n\nconst options = {\n printFunctionName: false,\n};\nconsole.log(prettyFormat(onClick, options));\n/*\n[Function]\n*/\n```\n\n<!-- prettier-ignore -->\n| key | type | default | description |\n| :-------------------- | :--------------- | :---------- | :-------------------------------------------------------------------------------------- |\n| `callToJSON` | `boolean` | `true` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function\\|null` | `undefined` | compare function used when sorting object keys, `null` can be used to skip over sorting |\n| `escapeRegex` | `boolean` | `false` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | `true` | escape special characters in strings |\n| `highlight` | `boolean` | `false` | highlight syntax with colors in terminal (some plugins) |\n| `indent` | `number` | `2` | spaces in each level of indentation |\n| `maxDepth` | `number` | `Infinity` | levels to print in arrays, objects, elements, and so on |\n| `maxWidth` | `number` | `Infinity` | number of elements to print in arrays, sets, and so on |\n| `min` | `boolean` | `false` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | `[]` | plugins to serialize application-specific data types |\n| `printBasicPrototype` | `boolean` | `false` | print the prototype for plain objects and arrays |\n| `printFunctionName` | `boolean` | `true` | include or omit the name of a function |\n| `theme` | `object` | | colors to highlight syntax in terminal |\n\nProperty values of `theme` are from [ansi-styles colors](https://github.com/chalk/ansi-styles#colors)\n\n```js\nconst DEFAULT_THEME = {\n comment: 'gray',\n content: 'reset',\n prop: 'yellow',\n tag: 'cyan',\n value: 'green',\n};\n```\n\n## Usage with plugins\n\nThe `pretty-format` package provides some built-in plugins, including:\n\n- `ReactElement` for elements from `react`\n- `ReactTestComponent` for test objects from `react-test-renderer`\n\n```js\n// CommonJS\nconst React = require('react');\nconst renderer = require('react-test-renderer');\nconst {format: prettyFormat, plugins} = require('pretty-format');\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\n// ES2015 modules and destructuring assignment\nimport React from 'react';\nimport renderer from 'react-test-renderer';\nimport {plugins, format as prettyFormat} from 'pretty-format';\n\nconst {ReactElement, ReactTestComponent} = plugins;\n```\n\n```js\nconst onClick = () => {};\nconst element = React.createElement('button', {onClick}, 'Hello World');\n\nconst formatted1 = prettyFormat(element, {\n plugins: [ReactElement],\n printFunctionName: false,\n});\nconst formatted2 = prettyFormat(renderer.create(element).toJSON(), {\n plugins: [ReactTestComponent],\n printFunctionName: false,\n});\n/*\n<button\n onClick=[Function]\n>\n Hello World\n</button>\n*/\n```\n\n## Usage in Jest\n\nFor snapshot tests, Jest uses `pretty-format` with options that include some of its built-in plugins. For this purpose, plugins are also known as **snapshot serializers**.\n\nTo serialize application-specific data types, you can add modules to `devDependencies` of a project, and then:\n\nIn an **individual** test file, you can add a module as follows. It precedes any modules from Jest configuration.\n\n```js\nimport serializer from 'my-serializer-module';\nexpect.addSnapshotSerializer(serializer);\n\n// tests which have `expect(value).toMatchSnapshot()` assertions\n```\n\nFor **all** test files, you can specify modules in Jest configuration. They precede built-in plugins for React, HTML, and Immutable.js data types. For example, in a `package.json` file:\n\n```json\n{\n \"jest\": {\n \"snapshotSerializers\": [\"my-serializer-module\"]\n }\n}\n```\n\n## Writing plugins\n\nA plugin is a JavaScript object.\n\nIf `options` has a `plugins` array: for the first plugin whose `test(val)` method returns a truthy value, then `prettyFormat(val, options)` returns the result from either:\n\n- `serialize(val, …)` method of the **improved** interface (available in **version 21** or later)\n- `print(val, …)` method of the **original** interface (if plugin does not have `serialize` method)\n\n### test\n\nWrite `test` so it can receive `val` argument of any type. To serialize **objects** which have certain properties, then a guarded expression like `val != null && …` or more concise `val && …` prevents the following errors:\n\n- `TypeError: Cannot read property 'whatever' of null`\n- `TypeError: Cannot read property 'whatever' of undefined`\n\nFor example, `test` method of built-in `ReactElement` plugin:\n\n```js\nconst elementSymbol = Symbol.for('react.element');\nconst test = val => val && val.$$typeof === elementSymbol;\n```\n\nPay attention to efficiency in `test` because `pretty-format` calls it often.\n\n### serialize\n\nThe **improved** interface is available in **version 21** or later.\n\nWrite `serialize` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- unchanging `config` object: derived from `options`\n- current `indentation` string: concatenate to `indent` from `config`\n- current `depth` number: compare to `maxDepth` from `config`\n- current `refs` array: find circular references in objects\n- `printer` callback function: serialize children\n\n### config\n\n<!-- prettier-ignore -->\n| key | type | description |\n| :------------------ | :--------------- | :-------------------------------------------------------------------------------------- |\n| `callToJSON` | `boolean` | call `toJSON` method (if it exists) on objects |\n| `compareKeys` | `function\\|null` | compare function used when sorting object keys, `null` can be used to skip over sorting |\n| `colors` | `Object` | escape codes for colors to highlight syntax |\n| `escapeRegex` | `boolean` | escape special characters in regular expressions |\n| `escapeString` | `boolean` | escape special characters in strings |\n| `indent` | `string` | spaces in each level of indentation |\n| `maxDepth` | `number` | levels to print in arrays, objects, elements, and so on |\n| `min` | `boolean` | minimize added space: no indentation nor line breaks |\n| `plugins` | `array` | plugins to serialize application-specific data types |\n| `printFunctionName` | `boolean` | include or omit the name of a function |\n| `spacingInner` | `string` | spacing to separate items in a list |\n| `spacingOuter` | `string` | spacing to enclose a list of items |\n\nEach property of `colors` in `config` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\nSome properties in `config` are derived from `min` in `options`:\n\n- `spacingInner` and `spacingOuter` are **newline** if `min` is `false`\n- `spacingInner` is **space** and `spacingOuter` is **empty string** if `min` is `true`\n\n### Example of serialize and test\n\nThis plugin is a pattern you can apply to serialize composite data types. Side note: `pretty-format` does not need a plugin to serialize arrays.\n\n```js\n// We reused more code when we factored out a function for child items\n// that is independent of depth, name, and enclosing punctuation (see below).\nconst SEPARATOR = ',';\nfunction serializeItems(items, config, indentation, depth, refs, printer) {\n if (items.length === 0) {\n return '';\n }\n const indentationItems = indentation + config.indent;\n return (\n config.spacingOuter +\n items\n .map(\n item =>\n indentationItems +\n printer(item, config, indentationItems, depth, refs), // callback\n )\n .join(SEPARATOR + config.spacingInner) +\n (config.min ? '' : SEPARATOR) + // following the last item\n config.spacingOuter +\n indentation\n );\n}\n\nconst plugin = {\n test(val) {\n return Array.isArray(val);\n },\n serialize(array, config, indentation, depth, refs, printer) {\n const name = array.constructor.name;\n return ++depth > config.maxDepth\n ? `[${name}]`\n : `${config.min ? '' : `${name} `}[${serializeItems(\n array,\n config,\n indentation,\n depth,\n refs,\n printer,\n )}]`;\n },\n};\n```\n\n```js\nconst val = {\n filter: 'completed',\n items: [\n {\n text: 'Write test',\n completed: true,\n },\n {\n text: 'Write serialize',\n completed: true,\n },\n ],\n};\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n indent: 4,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": Array [\n Object {\n \"completed\": true,\n \"text\": \"Write test\",\n },\n Object {\n \"completed\": true,\n \"text\": \"Write serialize\",\n },\n ],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n maxDepth: 1,\n plugins: [plugin],\n }),\n);\n/*\nObject {\n \"filter\": \"completed\",\n \"items\": [Array],\n}\n*/\n```\n\n```js\nconsole.log(\n prettyFormat(val, {\n min: true,\n plugins: [plugin],\n }),\n);\n/*\n{\"filter\": \"completed\", \"items\": [{\"completed\": true, \"text\": \"Write test\"}, {\"completed\": true, \"text\": \"Write serialize\"}]}\n*/\n```\n\n### print\n\nThe **original** interface is adequate for plugins:\n\n- that **do not** depend on options other than `highlight` or `min`\n- that **do not** depend on `depth` or `refs` in recursive traversal, and\n- if values either\n - do **not** require indentation, or\n - do **not** occur as children of JavaScript data structures (for example, array)\n\nWrite `print` to return a string, given the arguments:\n\n- `val` which “passed the test”\n- current `printer(valChild)` callback function: serialize children\n- current `indenter(lines)` callback function: indent lines at the next level\n- unchanging `config` object: derived from `options`\n- unchanging `colors` object: derived from `options`\n\nThe 3 properties of `config` are `min` in `options` and:\n\n- `spacing` and `edgeSpacing` are **newline** if `min` is `false`\n- `spacing` is **space** and `edgeSpacing` is **empty string** if `min` is `true`\n\nEach property of `colors` corresponds to a property of `theme` in `options`:\n\n- the key is the same (for example, `tag`)\n- the value in `colors` is a object with `open` and `close` properties whose values are escape codes from [ansi-styles](https://github.com/chalk/ansi-styles) for the color value in `theme` (for example, `'cyan'`)\n\n### Example of print and test\n\nThis plugin prints functions with the **number of named arguments** excluding rest argument.\n\n```js\nconst plugin = {\n print(val) {\n return `[Function ${val.name || 'anonymous'} ${val.length}]`;\n },\n test(val) {\n return typeof val === 'function';\n },\n};\n```\n\n```js\nconst val = {\n onClick(event) {},\n render() {},\n};\n\nprettyFormat(val, {\n plugins: [plugin],\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val);\n/*\nObject {\n \"onClick\": [Function onClick],\n \"render\": [Function render],\n}\n*/\n```\n\nThis plugin **ignores** the `printFunctionName` option. That limitation of the original `print` interface is a reason to use the improved `serialize` interface, described above.\n\n```js\nprettyFormat(val, {\n plugins: [pluginOld],\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function onClick 1],\n \"render\": [Function render 0],\n}\n*/\n\nprettyFormat(val, {\n printFunctionName: false,\n});\n/*\nObject {\n \"onClick\": [Function],\n \"render\": [Function],\n}\n*/\n```\n","readmeFilename":"README.md","bugs":{"url":"https://github.com/jestjs/jest/issues"},"homepage":"https://github.com/jestjs/jest#readme","_id":"pretty-format@30.0.0-alpha.3","_nodeVersion":"20.11.1","_npmVersion":"lerna/3.2.1/node@v20.11.1+arm64 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