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denoland-deno/cli/tsc/dts/lib.deno.ns.d.ts
Luca Casonato d42f154312
feat: disposable Deno resources (#20845) 
This commit implements Symbol.dispose and Symbol.asyncDispose for
the relevant resources.

Closes #20839

---------

Signed-off-by: Bartek Iwańczuk <biwanczuk@gmail.com>
Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
2023-11-01 20:26:12 +01:00

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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
/// <reference no-default-lib="true" />
/// <reference lib="esnext" />
/// <reference lib="esnext.disposable" />
/// <reference lib="deno.net" />
/** Deno provides extra properties on `import.meta`. These are included here
* to ensure that these are still available when using the Deno namespace in
* conjunction with other type libs, like `dom`.
*
* @category ES Modules
*/
declare interface ImportMeta {
/** A string representation of the fully qualified module URL. When the
* module is loaded locally, the value will be a file URL (e.g.
* `file:///path/module.ts`).
*
* You can also parse the string as a URL to determine more information about
* how the current module was loaded. For example to determine if a module was
* local or not:
*
* ```ts
* const url = new URL(import.meta.url);
* if (url.protocol === "file:") {
* console.log("this module was loaded locally");
* }
* ```
*/
url: string;
/** A flag that indicates if the current module is the main module that was
* called when starting the program under Deno.
*
* ```ts
* if (import.meta.main) {
* // this was loaded as the main module, maybe do some bootstrapping
* }
* ```
*/
main: boolean;
/** A function that returns resolved specifier as if it would be imported
* using `import(specifier)`.
*
* ```ts
* console.log(import.meta.resolve("./foo.js"));
* // file:///dev/foo.js
* ```
*/
resolve(specifier: string): string;
}
/** Deno supports [User Timing Level 3](https://w3c.github.io/user-timing)
* which is not widely supported yet in other runtimes.
*
* Check out the
* [Performance API](https://developer.mozilla.org/en-US/docs/Web/API/Performance)
* documentation on MDN for further information about how to use the API.
*
* @category Performance
*/
declare interface Performance {
/** Stores a timestamp with the associated name (a "mark"). */
mark(markName: string, options?: PerformanceMarkOptions): PerformanceMark;
/** Stores the `DOMHighResTimeStamp` duration between two marks along with the
* associated name (a "measure"). */
measure(
measureName: string,
options?: PerformanceMeasureOptions,
): PerformanceMeasure;
}
/**
* Options which are used in conjunction with `performance.mark`. Check out the
* MDN
* [`performance.mark()`](https://developer.mozilla.org/en-US/docs/Web/API/Performance/mark#markoptions)
* documentation for more details.
*
* @category Performance
*/
declare interface PerformanceMarkOptions {
/** Metadata to be included in the mark. */
// deno-lint-ignore no-explicit-any
detail?: any;
/** Timestamp to be used as the mark time. */
startTime?: number;
}
/**
* Options which are used in conjunction with `performance.measure`. Check out the
* MDN
* [`performance.mark()`](https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure#measureoptions)
* documentation for more details.
*
* @category Performance
*/
declare interface PerformanceMeasureOptions {
/** Metadata to be included in the measure. */
// deno-lint-ignore no-explicit-any
detail?: any;
/** Timestamp to be used as the start time or string to be used as start
* mark. */
start?: string | number;
/** Duration between the start and end times. */
duration?: number;
/** Timestamp to be used as the end time or string to be used as end mark. */
end?: string | number;
}
/** The global namespace where Deno specific, non-standard APIs are located. */
declare namespace Deno {
/** A set of error constructors that are raised by Deno APIs.
*
* Can be used to provide more specific handling of failures within code
* which is using Deno APIs. For example, handling attempting to open a file
* which does not exist:
*
* ```ts
* try {
* const file = await Deno.open("./some/file.txt");
* } catch (error) {
* if (error instanceof Deno.errors.NotFound) {
* console.error("the file was not found");
* } else {
* // otherwise re-throw
* throw error;
* }
* }
* ```
*
* @category Errors
*/
export namespace errors {
/**
* Raised when the underlying operating system indicates that the file
* was not found.
*
* @category Errors */
export class NotFound extends Error {}
/**
* Raised when the underlying operating system indicates the current user
* which the Deno process is running under does not have the appropriate
* permissions to a file or resource, or the user _did not_ provide required
* `--allow-*` flag.
*
* @category Errors */
export class PermissionDenied extends Error {}
/**
* Raised when the underlying operating system reports that a connection to
* a resource is refused.
*
* @category Errors */
export class ConnectionRefused extends Error {}
/**
* Raised when the underlying operating system reports that a connection has
* been reset. With network servers, it can be a _normal_ occurrence where a
* client will abort a connection instead of properly shutting it down.
*
* @category Errors */
export class ConnectionReset extends Error {}
/**
* Raised when the underlying operating system reports an `ECONNABORTED`
* error.
*
* @category Errors */
export class ConnectionAborted extends Error {}
/**
* Raised when the underlying operating system reports an `ENOTCONN` error.
*
* @category Errors */
export class NotConnected extends Error {}
/**
* Raised when attempting to open a server listener on an address and port
* that already has a listener.
*
* @category Errors */
export class AddrInUse extends Error {}
/**
* Raised when the underlying operating system reports an `EADDRNOTAVAIL`
* error.
*
* @category Errors */
export class AddrNotAvailable extends Error {}
/**
* Raised when trying to write to a resource and a broken pipe error occurs.
* This can happen when trying to write directly to `stdout` or `stderr`
* and the operating system is unable to pipe the output for a reason
* external to the Deno runtime.
*
* @category Errors */
export class BrokenPipe extends Error {}
/**
* Raised when trying to create a resource, like a file, that already
* exits.
*
* @category Errors */
export class AlreadyExists extends Error {}
/**
* Raised when an operation to returns data that is invalid for the
* operation being performed.
*
* @category Errors */
export class InvalidData extends Error {}
/**
* Raised when the underlying operating system reports that an I/O operation
* has timed out (`ETIMEDOUT`).
*
* @category Errors */
export class TimedOut extends Error {}
/**
* Raised when the underlying operating system reports an `EINTR` error. In
* many cases, this underlying IO error will be handled internally within
* Deno, or result in an @{link BadResource} error instead.
*
* @category Errors */
export class Interrupted extends Error {}
/**
* Raised when the underlying operating system would need to block to
* complete but an asynchronous (non-blocking) API is used.
*
* @category Errors */
export class WouldBlock extends Error {}
/**
* Raised when expecting to write to a IO buffer resulted in zero bytes
* being written.
*
* @category Errors */
export class WriteZero extends Error {}
/**
* Raised when attempting to read bytes from a resource, but the EOF was
* unexpectedly encountered.
*
* @category Errors */
export class UnexpectedEof extends Error {}
/**
* The underlying IO resource is invalid or closed, and so the operation
* could not be performed.
*
* @category Errors */
export class BadResource extends Error {}
/**
* Raised in situations where when attempting to load a dynamic import,
* too many redirects were encountered.
*
* @category Errors */
export class Http extends Error {}
/**
* Raised when the underlying IO resource is not available because it is
* being awaited on in another block of code.
*
* @category Errors */
export class Busy extends Error {}
/**
* Raised when the underlying Deno API is asked to perform a function that
* is not currently supported.
*
* @category Errors */
export class NotSupported extends Error {}
/**
* Raised when too many symbolic links were encountered when resolving the
* filename.
*
* @category Errors */
export class FilesystemLoop extends Error {}
/**
* Raised when trying to open, create or write to a directory.
*
* @category Errors */
export class IsADirectory extends Error {}
/**
* Raised when performing a socket operation but the remote host is
* not reachable.
*
* @category Errors */
export class NetworkUnreachable extends Error {}
/**
* Raised when trying to perform an operation on a path that is not a
* directory, when directory is required.
*
* @category Errors */
export class NotADirectory extends Error {}
}
/** The current process ID of this instance of the Deno CLI.
*
* ```ts
* console.log(Deno.pid);
* ```
*
* @category Runtime Environment
*/
export const pid: number;
/**
* The process ID of parent process of this instance of the Deno CLI.
*
* ```ts
* console.log(Deno.ppid);
* ```
*
* @category Runtime Environment
*/
export const ppid: number;
/** @category Runtime Environment */
export interface MemoryUsage {
/** The number of bytes of the current Deno's process resident set size,
* which is the amount of memory occupied in main memory (RAM). */
rss: number;
/** The total size of the heap for V8, in bytes. */
heapTotal: number;
/** The amount of the heap used for V8, in bytes. */
heapUsed: number;
/** Memory, in bytes, associated with JavaScript objects outside of the
* JavaScript isolate. */
external: number;
}
/**
* Returns an object describing the memory usage of the Deno process and the
* V8 subsystem measured in bytes.
*
* @category Runtime Environment
*/
export function memoryUsage(): MemoryUsage;
/**
* Get the `hostname` of the machine the Deno process is running on.
*
* ```ts
* console.log(Deno.hostname());
* ```
*
* Requires `allow-sys` permission.
*
* @tags allow-sys
* @category Runtime Environment
*/
export function hostname(): string;
/**
* Returns an array containing the 1, 5, and 15 minute load averages. The
* load average is a measure of CPU and IO utilization of the last one, five,
* and 15 minute periods expressed as a fractional number. Zero means there
* is no load. On Windows, the three values are always the same and represent
* the current load, not the 1, 5 and 15 minute load averages.
*
* ```ts
* console.log(Deno.loadavg()); // e.g. [ 0.71, 0.44, 0.44 ]
* ```
*
* Requires `allow-sys` permission.
*
* On Windows there is no API available to retrieve this information and this method returns `[ 0, 0, 0 ]`.
*
* @tags allow-sys
* @category Observability
*/
export function loadavg(): number[];
/**
* The information for a network interface returned from a call to
* {@linkcode Deno.networkInterfaces}.
*
* @category Network
*/
export interface NetworkInterfaceInfo {
/** The network interface name. */
name: string;
/** The IP protocol version. */
family: "IPv4" | "IPv6";
/** The IP address bound to the interface. */
address: string;
/** The netmask applied to the interface. */
netmask: string;
/** The IPv6 scope id or `null`. */
scopeid: number | null;
/** The CIDR range. */
cidr: string;
/** The MAC address. */
mac: string;
}
/**
* Returns an array of the network interface information.
*
* ```ts
* console.log(Deno.networkInterfaces());
* ```
*
* Requires `allow-sys` permission.
*
* @tags allow-sys
* @category Network
*/
export function networkInterfaces(): NetworkInterfaceInfo[];
/**
* Displays the total amount of free and used physical and swap memory in the
* system, as well as the buffers and caches used by the kernel.
*
* This is similar to the `free` command in Linux
*
* ```ts
* console.log(Deno.systemMemoryInfo());
* ```
*
* Requires `allow-sys` permission.
*
* @tags allow-sys
* @category Runtime Environment
*/
export function systemMemoryInfo(): SystemMemoryInfo;
/**
* Information returned from a call to {@linkcode Deno.systemMemoryInfo}.
*
* @category Runtime Environment
*/
export interface SystemMemoryInfo {
/** Total installed memory in bytes. */
total: number;
/** Unused memory in bytes. */
free: number;
/** Estimation of how much memory, in bytes, is available for starting new
* applications, without swapping. Unlike the data provided by the cache or
* free fields, this field takes into account page cache and also that not
* all reclaimable memory will be reclaimed due to items being in use.
*/
available: number;
/** Memory used by kernel buffers. */
buffers: number;
/** Memory used by the page cache and slabs. */
cached: number;
/** Total swap memory. */
swapTotal: number;
/** Unused swap memory. */
swapFree: number;
}
/** Reflects the `NO_COLOR` environment variable at program start.
*
* When the value is `true`, the Deno CLI will attempt to not send color codes
* to `stderr` or `stdout` and other command line programs should also attempt
* to respect this value.
*
* See: https://no-color.org/
*
* @category Runtime Environment
*/
export const noColor: boolean;
/**
* Returns the release version of the Operating System.
*
* ```ts
* console.log(Deno.osRelease());
* ```
*
* Requires `allow-sys` permission.
* Under consideration to possibly move to Deno.build or Deno.versions and if
* it should depend sys-info, which may not be desirable.
*
* @tags allow-sys
* @category Runtime Environment
*/
export function osRelease(): string;
/**
* Returns the Operating System uptime in number of seconds.
*
* ```ts
* console.log(Deno.osUptime());
* ```
*
* Requires `allow-sys` permission.
*
* @tags allow-sys
* @category Runtime Environment
*/
export function osUptime(): number;
/**
* Options which define the permissions within a test or worker context.
*
* `"inherit"` ensures that all permissions of the parent process will be
* applied to the test context. `"none"` ensures the test context has no
* permissions. A `PermissionOptionsObject` provides a more specific
* set of permissions to the test context.
*
* @category Permissions */
export type PermissionOptions =
| "inherit"
| "none"
| PermissionOptionsObject;
/**
* A set of options which can define the permissions within a test or worker
* context at a highly specific level.
*
* @category Permissions */
export interface PermissionOptionsObject {
/** Specifies if the `env` permission should be requested or revoked.
* If set to `"inherit"`, the current `env` permission will be inherited.
* If set to `true`, the global `env` permission will be requested.
* If set to `false`, the global `env` permission will be revoked.
*
* @default {false}
*/
env?: "inherit" | boolean | string[];
/** Specifies if the `sys` permission should be requested or revoked.
* If set to `"inherit"`, the current `sys` permission will be inherited.
* If set to `true`, the global `sys` permission will be requested.
* If set to `false`, the global `sys` permission will be revoked.
*
* @default {false}
*/
sys?: "inherit" | boolean | string[];
/** Specifies if the `hrtime` permission should be requested or revoked.
* If set to `"inherit"`, the current `hrtime` permission will be inherited.
* If set to `true`, the global `hrtime` permission will be requested.
* If set to `false`, the global `hrtime` permission will be revoked.
*
* @default {false}
*/
hrtime?: "inherit" | boolean;
/** Specifies if the `net` permission should be requested or revoked.
* if set to `"inherit"`, the current `net` permission will be inherited.
* if set to `true`, the global `net` permission will be requested.
* if set to `false`, the global `net` permission will be revoked.
* if set to `string[]`, the `net` permission will be requested with the
* specified host strings with the format `"<host>[:<port>]`.
*
* @default {false}
*
* Examples:
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test({
* name: "inherit",
* permissions: {
* net: "inherit",
* },
* async fn() {
* const status = await Deno.permissions.query({ name: "net" })
* assertEquals(status.state, "granted");
* },
* });
* ```
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test({
* name: "true",
* permissions: {
* net: true,
* },
* async fn() {
* const status = await Deno.permissions.query({ name: "net" });
* assertEquals(status.state, "granted");
* },
* });
* ```
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test({
* name: "false",
* permissions: {
* net: false,
* },
* async fn() {
* const status = await Deno.permissions.query({ name: "net" });
* assertEquals(status.state, "denied");
* },
* });
* ```
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test({
* name: "localhost:8080",
* permissions: {
* net: ["localhost:8080"],
* },
* async fn() {
* const status = await Deno.permissions.query({ name: "net", host: "localhost:8080" });
* assertEquals(status.state, "granted");
* },
* });
* ```
*/
net?: "inherit" | boolean | string[];
/** Specifies if the `ffi` permission should be requested or revoked.
* If set to `"inherit"`, the current `ffi` permission will be inherited.
* If set to `true`, the global `ffi` permission will be requested.
* If set to `false`, the global `ffi` permission will be revoked.
*
* @default {false}
*/
ffi?: "inherit" | boolean | Array<string | URL>;
/** Specifies if the `read` permission should be requested or revoked.
* If set to `"inherit"`, the current `read` permission will be inherited.
* If set to `true`, the global `read` permission will be requested.
* If set to `false`, the global `read` permission will be revoked.
* If set to `Array<string | URL>`, the `read` permission will be requested with the
* specified file paths.
*
* @default {false}
*/
read?: "inherit" | boolean | Array<string | URL>;
/** Specifies if the `run` permission should be requested or revoked.
* If set to `"inherit"`, the current `run` permission will be inherited.
* If set to `true`, the global `run` permission will be requested.
* If set to `false`, the global `run` permission will be revoked.
*
* @default {false}
*/
run?: "inherit" | boolean | Array<string | URL>;
/** Specifies if the `write` permission should be requested or revoked.
* If set to `"inherit"`, the current `write` permission will be inherited.
* If set to `true`, the global `write` permission will be requested.
* If set to `false`, the global `write` permission will be revoked.
* If set to `Array<string | URL>`, the `write` permission will be requested with the
* specified file paths.
*
* @default {false}
*/
write?: "inherit" | boolean | Array<string | URL>;
}
/**
* Context that is passed to a testing function, which can be used to either
* gain information about the current test, or register additional test
* steps within the current test.
*
* @category Testing */
export interface TestContext {
/** The current test name. */
name: string;
/** The string URL of the current test. */
origin: string;
/** If the current test is a step of another test, the parent test context
* will be set here. */
parent?: TestContext;
/** Run a sub step of the parent test or step. Returns a promise
* that resolves to a boolean signifying if the step completed successfully.
*
* The returned promise never rejects unless the arguments are invalid.
*
* If the test was ignored the promise returns `false`.
*
* ```ts
* Deno.test({
* name: "a parent test",
* async fn(t) {
* console.log("before the step");
* await t.step({
* name: "step 1",
* fn(t) {
* console.log("current step:", t.name);
* }
* });
* console.log("after the step");
* }
* });
* ```
*/
step(definition: TestStepDefinition): Promise<boolean>;
/** Run a sub step of the parent test or step. Returns a promise
* that resolves to a boolean signifying if the step completed successfully.
*
* The returned promise never rejects unless the arguments are invalid.
*
* If the test was ignored the promise returns `false`.
*
* ```ts
* Deno.test(
* "a parent test",
* async (t) => {
* console.log("before the step");
* await t.step(
* "step 1",
* (t) => {
* console.log("current step:", t.name);
* }
* );
* console.log("after the step");
* }
* );
* ```
*/
step(
name: string,
fn: (t: TestContext) => void | Promise<void>,
): Promise<boolean>;
/** Run a sub step of the parent test or step. Returns a promise
* that resolves to a boolean signifying if the step completed successfully.
*
* The returned promise never rejects unless the arguments are invalid.
*
* If the test was ignored the promise returns `false`.
*
* ```ts
* Deno.test(async function aParentTest(t) {
* console.log("before the step");
* await t.step(function step1(t) {
* console.log("current step:", t.name);
* });
* console.log("after the step");
* });
* ```
*/
step(fn: (t: TestContext) => void | Promise<void>): Promise<boolean>;
}
/** @category Testing */
export interface TestStepDefinition {
/** The test function that will be tested when this step is executed. The
* function can take an argument which will provide information about the
* current step's context. */
fn: (t: TestContext) => void | Promise<void>;
/** The name of the step. */
name: string;
/** If truthy the current test step will be ignored.
*
* This is a quick way to skip over a step, but also can be used for
* conditional logic, like determining if an environment feature is present.
*/
ignore?: boolean;
/** Check that the number of async completed operations after the test step
* is the same as number of dispatched operations. This ensures that the
* code tested does not start async operations which it then does
* not await. This helps in preventing logic errors and memory leaks
* in the application code.
*
* Defaults to the parent test or step's value. */
sanitizeOps?: boolean;
/** Ensure the test step does not "leak" resources - like open files or
* network connections - by ensuring the open resources at the start of the
* step match the open resources at the end of the step.
*
* Defaults to the parent test or step's value. */
sanitizeResources?: boolean;
/** Ensure the test step does not prematurely cause the process to exit,
* for example via a call to {@linkcode Deno.exit}.
*
* Defaults to the parent test or step's value. */
sanitizeExit?: boolean;
}
/** @category Testing */
export interface TestDefinition {
fn: (t: TestContext) => void | Promise<void>;
/** The name of the test. */
name: string;
/** If truthy the current test step will be ignored.
*
* It is a quick way to skip over a step, but also can be used for
* conditional logic, like determining if an environment feature is present.
*/
ignore?: boolean;
/** If at least one test has `only` set to `true`, only run tests that have
* `only` set to `true` and fail the test suite. */
only?: boolean;
/** Check that the number of async completed operations after the test step
* is the same as number of dispatched operations. This ensures that the
* code tested does not start async operations which it then does
* not await. This helps in preventing logic errors and memory leaks
* in the application code.
*
* @default {true} */
sanitizeOps?: boolean;
/** Ensure the test step does not "leak" resources - like open files or
* network connections - by ensuring the open resources at the start of the
* test match the open resources at the end of the test.
*
* @default {true} */
sanitizeResources?: boolean;
/** Ensure the test case does not prematurely cause the process to exit,
* for example via a call to {@linkcode Deno.exit}.
*
* @default {true} */
sanitizeExit?: boolean;
/** Specifies the permissions that should be used to run the test.
*
* Set this to "inherit" to keep the calling runtime permissions, set this
* to "none" to revoke all permissions, or set a more specific set of
* permissions using a {@linkcode PermissionOptionsObject}.
*
* @default {"inherit"} */
permissions?: PermissionOptions;
}
export const test: DenoTest;
interface DenoTest {
/** Register a test which will be run when `deno test` is used on the command
* line and the containing module looks like a test module.
*
* `fn` can be async if required.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test({
* name: "example test",
* fn() {
* assertEquals("world", "world");
* },
* });
*
* Deno.test({
* name: "example ignored test",
* ignore: Deno.build.os === "windows",
* fn() {
* // This test is ignored only on Windows machines
* },
* });
*
* Deno.test({
* name: "example async test",
* async fn() {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* }
* });
* ```
*
* @category Testing
*/
(t: TestDefinition): void;
/** Register a test which will be run when `deno test` is used on the command
* line and the containing module looks like a test module.
*
* `fn` can be async if required.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test("My test description", () => {
* assertEquals("hello", "hello");
* });
*
* Deno.test("My async test description", async () => {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* });
* ```
*
* @category Testing
*/
(
name: string,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Register a test which will be run when `deno test` is used on the command
* line and the containing module looks like a test module.
*
* `fn` can be async if required. Declared function must have a name.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test(function myTestName() {
* assertEquals("hello", "hello");
* });
*
* Deno.test(async function myOtherTestName() {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* });
* ```
*
* @category Testing
*/
(fn: (t: TestContext) => void | Promise<void>): void;
/** Register a test which will be run when `deno test` is used on the command
* line and the containing module looks like a test module.
*
* `fn` can be async if required.
*
* ```ts
* import {assert, fail, assertEquals} from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test("My test description", { permissions: { read: true } }, (): void => {
* assertEquals("hello", "hello");
* });
*
* Deno.test("My async test description", { permissions: { read: false } }, async (): Promise<void> => {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* });
* ```
*
* @category Testing
*/
(
name: string,
options: Omit<TestDefinition, "fn" | "name">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Register a test which will be run when `deno test` is used on the command
* line and the containing module looks like a test module.
*
* `fn` can be async if required.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test(
* {
* name: "My test description",
* permissions: { read: true },
* },
* () => {
* assertEquals("hello", "hello");
* },
* );
*
* Deno.test(
* {
* name: "My async test description",
* permissions: { read: false },
* },
* async () => {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* },
* );
* ```
*
* @category Testing
*/
(
options: Omit<TestDefinition, "fn" | "name">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Register a test which will be run when `deno test` is used on the command
* line and the containing module looks like a test module.
*
* `fn` can be async if required. Declared function must have a name.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.test(
* { permissions: { read: true } },
* function myTestName() {
* assertEquals("hello", "hello");
* },
* );
*
* Deno.test(
* { permissions: { read: false } },
* async function myOtherTestName() {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* },
* );
* ```
*
* @category Testing
*/
(
options: Omit<TestDefinition, "fn">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for ignoring a particular test case.
*
* @category Testing
*/
ignore(t: Omit<TestDefinition, "ignore">): void;
/** Shorthand property for ignoring a particular test case.
*
* @category Testing
*/
ignore(
name: string,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for ignoring a particular test case.
*
* @category Testing
*/
ignore(fn: (t: TestContext) => void | Promise<void>): void;
/** Shorthand property for ignoring a particular test case.
*
* @category Testing
*/
ignore(
name: string,
options: Omit<TestDefinition, "fn" | "name" | "ignore">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for ignoring a particular test case.
*
* @category Testing
*/
ignore(
options: Omit<TestDefinition, "fn" | "name" | "ignore">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for ignoring a particular test case.
*
* @category Testing
*/
ignore(
options: Omit<TestDefinition, "fn" | "ignore">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for focusing a particular test case.
*
* @category Testing
*/
only(t: Omit<TestDefinition, "only">): void;
/** Shorthand property for focusing a particular test case.
*
* @category Testing
*/
only(
name: string,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for focusing a particular test case.
*
* @category Testing
*/
only(fn: (t: TestContext) => void | Promise<void>): void;
/** Shorthand property for focusing a particular test case.
*
* @category Testing
*/
only(
name: string,
options: Omit<TestDefinition, "fn" | "name" | "only">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for focusing a particular test case.
*
* @category Testing
*/
only(
options: Omit<TestDefinition, "fn" | "name" | "only">,
fn: (t: TestContext) => void | Promise<void>,
): void;
/** Shorthand property for focusing a particular test case.
*
* @category Testing
*/
only(
options: Omit<TestDefinition, "fn" | "only">,
fn: (t: TestContext) => void | Promise<void>,
): void;
}
/**
* Context that is passed to a benchmarked function. The instance is shared
* between iterations of the benchmark. Its methods can be used for example
* to override of the measured portion of the function.
*
* @category Testing
*/
export interface BenchContext {
/** The current benchmark name. */
name: string;
/** The string URL of the current benchmark. */
origin: string;
/** Restarts the timer for the bench measurement. This should be called
* after doing setup work which should not be measured.
*
* Warning: This method should not be used for benchmarks averaging less
* than 10μs per iteration. In such cases it will be disabled but the call
* will still have noticeable overhead, resulting in a warning.
*
* ```ts
* Deno.bench("foo", async (t) => {
* const data = await Deno.readFile("data.txt");
* t.start();
* // some operation on `data`...
* });
* ```
*/
start(): void;
/** End the timer early for the bench measurement. This should be called
* before doing teardown work which should not be measured.
*
* Warning: This method should not be used for benchmarks averaging less
* than 10μs per iteration. In such cases it will be disabled but the call
* will still have noticeable overhead, resulting in a warning.
*
* ```ts
* Deno.bench("foo", async (t) => {
* const file = await Deno.open("data.txt");
* t.start();
* // some operation on `file`...
* t.end();
* file.close();
* });
* ```
*/
end(): void;
}
/**
* The interface for defining a benchmark test using {@linkcode Deno.bench}.
*
* @category Testing
*/
export interface BenchDefinition {
/** The test function which will be benchmarked. */
fn: (b: BenchContext) => void | Promise<void>;
/** The name of the test, which will be used in displaying the results. */
name: string;
/** If truthy, the benchmark test will be ignored/skipped. */
ignore?: boolean;
/** Group name for the benchmark.
*
* Grouped benchmarks produce a group time summary, where the difference
* in performance between each test of the group is compared. */
group?: string;
/** Benchmark should be used as the baseline for other benchmarks.
*
* If there are multiple baselines in a group, the first one is used as the
* baseline. */
baseline?: boolean;
/** If at least one bench has `only` set to true, only run benches that have
* `only` set to `true` and fail the bench suite. */
only?: boolean;
/** Ensure the bench case does not prematurely cause the process to exit,
* for example via a call to {@linkcode Deno.exit}.
*
* @default {true} */
sanitizeExit?: boolean;
/** Specifies the permissions that should be used to run the bench.
*
* Set this to `"inherit"` to keep the calling thread's permissions.
*
* Set this to `"none"` to revoke all permissions.
*
* @default {"inherit"}
*/
permissions?: PermissionOptions;
}
/**
* Register a benchmark test which will be run when `deno bench` is used on
* the command line and the containing module looks like a bench module.
*
* If the test function (`fn`) returns a promise or is async, the test runner
* will await resolution to consider the test complete.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.bench({
* name: "example test",
* fn() {
* assertEquals("world", "world");
* },
* });
*
* Deno.bench({
* name: "example ignored test",
* ignore: Deno.build.os === "windows",
* fn() {
* // This test is ignored only on Windows machines
* },
* });
*
* Deno.bench({
* name: "example async test",
* async fn() {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* }
* });
* ```
*
* @category Testing
*/
export function bench(b: BenchDefinition): void;
/**
* Register a benchmark test which will be run when `deno bench` is used on
* the command line and the containing module looks like a bench module.
*
* If the test function (`fn`) returns a promise or is async, the test runner
* will await resolution to consider the test complete.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.bench("My test description", () => {
* assertEquals("hello", "hello");
* });
*
* Deno.bench("My async test description", async () => {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* });
* ```
*
* @category Testing
*/
export function bench(
name: string,
fn: (b: BenchContext) => void | Promise<void>,
): void;
/**
* Register a benchmark test which will be run when `deno bench` is used on
* the command line and the containing module looks like a bench module.
*
* If the test function (`fn`) returns a promise or is async, the test runner
* will await resolution to consider the test complete.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.bench(function myTestName() {
* assertEquals("hello", "hello");
* });
*
* Deno.bench(async function myOtherTestName() {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* });
* ```
*
* @category Testing
*/
export function bench(fn: (b: BenchContext) => void | Promise<void>): void;
/**
* Register a benchmark test which will be run when `deno bench` is used on
* the command line and the containing module looks like a bench module.
*
* If the test function (`fn`) returns a promise or is async, the test runner
* will await resolution to consider the test complete.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.bench(
* "My test description",
* { permissions: { read: true } },
* () => {
* assertEquals("hello", "hello");
* }
* );
*
* Deno.bench(
* "My async test description",
* { permissions: { read: false } },
* async () => {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* }
* );
* ```
*
* @category Testing
*/
export function bench(
name: string,
options: Omit<BenchDefinition, "fn" | "name">,
fn: (b: BenchContext) => void | Promise<void>,
): void;
/**
* Register a benchmark test which will be run when `deno bench` is used on
* the command line and the containing module looks like a bench module.
*
* If the test function (`fn`) returns a promise or is async, the test runner
* will await resolution to consider the test complete.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.bench(
* { name: "My test description", permissions: { read: true } },
* () => {
* assertEquals("hello", "hello");
* }
* );
*
* Deno.bench(
* { name: "My async test description", permissions: { read: false } },
* async () => {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* }
* );
* ```
*
* @category Testing
*/
export function bench(
options: Omit<BenchDefinition, "fn">,
fn: (b: BenchContext) => void | Promise<void>,
): void;
/**
* Register a benchmark test which will be run when `deno bench` is used on
* the command line and the containing module looks like a bench module.
*
* If the test function (`fn`) returns a promise or is async, the test runner
* will await resolution to consider the test complete.
*
* ```ts
* import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
*
* Deno.bench(
* { permissions: { read: true } },
* function myTestName() {
* assertEquals("hello", "hello");
* }
* );
*
* Deno.bench(
* { permissions: { read: false } },
* async function myOtherTestName() {
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello_world.txt");
* assertEquals(decoder.decode(data), "Hello world");
* }
* );
* ```
*
* @category Testing
*/
export function bench(
options: Omit<BenchDefinition, "fn" | "name">,
fn: (b: BenchContext) => void | Promise<void>,
): void;
/** Exit the Deno process with optional exit code.
*
* If no exit code is supplied then Deno will exit with return code of `0`.
*
* In worker contexts this is an alias to `self.close();`.
*
* ```ts
* Deno.exit(5);
* ```
*
* @category Runtime Environment
*/
export function exit(code?: number): never;
/** An interface containing methods to interact with the process environment
* variables.
*
* @tags allow-env
* @category Runtime Environment
*/
export interface Env {
/** Retrieve the value of an environment variable.
*
* Returns `undefined` if the supplied environment variable is not defined.
*
* ```ts
* console.log(Deno.env.get("HOME")); // e.g. outputs "/home/alice"
* console.log(Deno.env.get("MADE_UP_VAR")); // outputs "undefined"
* ```
*
* Requires `allow-env` permission.
*
* @tags allow-env
*/
get(key: string): string | undefined;
/** Set the value of an environment variable.
*
* ```ts
* Deno.env.set("SOME_VAR", "Value");
* Deno.env.get("SOME_VAR"); // outputs "Value"
* ```
*
* Requires `allow-env` permission.
*
* @tags allow-env
*/
set(key: string, value: string): void;
/** Delete the value of an environment variable.
*
* ```ts
* Deno.env.set("SOME_VAR", "Value");
* Deno.env.delete("SOME_VAR"); // outputs "undefined"
* ```
*
* Requires `allow-env` permission.
*
* @tags allow-env
*/
delete(key: string): void;
/** Check whether an environment variable is present or not.
*
* ```ts
* Deno.env.set("SOME_VAR", "Value");
* Deno.env.has("SOME_VAR"); // outputs true
* ```
*
* Requires `allow-env` permission.
*
* @tags allow-env
*/
has(key: string): boolean;
/** Returns a snapshot of the environment variables at invocation as a
* simple object of keys and values.
*
* ```ts
* Deno.env.set("TEST_VAR", "A");
* const myEnv = Deno.env.toObject();
* console.log(myEnv.SHELL);
* Deno.env.set("TEST_VAR", "B");
* console.log(myEnv.TEST_VAR); // outputs "A"
* ```
*
* Requires `allow-env` permission.
*
* @tags allow-env
*/
toObject(): { [index: string]: string };
}
/** An interface containing methods to interact with the process environment
* variables.
*
* @tags allow-env
* @category Runtime Environment
*/
export const env: Env;
/**
* Returns the path to the current deno executable.
*
* ```ts
* console.log(Deno.execPath()); // e.g. "/home/alice/.local/bin/deno"
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category Runtime Environment
*/
export function execPath(): string;
/**
* Change the current working directory to the specified path.
*
* ```ts
* Deno.chdir("/home/userA");
* Deno.chdir("../userB");
* Deno.chdir("C:\\Program Files (x86)\\Java");
* ```
*
* Throws {@linkcode Deno.errors.NotFound} if directory not found.
*
* Throws {@linkcode Deno.errors.PermissionDenied} if the user does not have
* operating system file access rights.
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category Runtime Environment
*/
export function chdir(directory: string | URL): void;
/**
* Return a string representing the current working directory.
*
* If the current directory can be reached via multiple paths (due to symbolic
* links), `cwd()` may return any one of them.
*
* ```ts
* const currentWorkingDirectory = Deno.cwd();
* ```
*
* Throws {@linkcode Deno.errors.NotFound} if directory not available.
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category Runtime Environment
*/
export function cwd(): string;
/**
* Creates `newpath` as a hard link to `oldpath`.
*
* ```ts
* await Deno.link("old/name", "new/name");
* ```
*
* Requires `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function link(oldpath: string, newpath: string): Promise<void>;
/**
* Synchronously creates `newpath` as a hard link to `oldpath`.
*
* ```ts
* Deno.linkSync("old/name", "new/name");
* ```
*
* Requires `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function linkSync(oldpath: string, newpath: string): void;
/**
* A enum which defines the seek mode for IO related APIs that support
* seeking.
*
* @category I/O */
export enum SeekMode {
/* Seek from the start of the file/resource. */
Start = 0,
/* Seek from the current position within the file/resource. */
Current = 1,
/* Seek from the end of the current file/resource. */
End = 2,
}
/**
* An abstract interface which when implemented provides an interface to read
* bytes into an array buffer asynchronously.
*
* @category I/O */
export interface Reader {
/** Reads up to `p.byteLength` bytes into `p`. It resolves to the number of
* bytes read (`0` < `n` <= `p.byteLength`) and rejects if any error
* encountered. Even if `read()` resolves to `n` < `p.byteLength`, it may
* use all of `p` as scratch space during the call. If some data is
* available but not `p.byteLength` bytes, `read()` conventionally resolves
* to what is available instead of waiting for more.
*
* When `read()` encounters end-of-file condition, it resolves to EOF
* (`null`).
*
* When `read()` encounters an error, it rejects with an error.
*
* Callers should always process the `n` > `0` bytes returned before
* considering the EOF (`null`). Doing so correctly handles I/O errors that
* happen after reading some bytes and also both of the allowed EOF
* behaviors.
*
* Implementations should not retain a reference to `p`.
*
* Use
* [`itereateReader`](https://deno.land/std/streams/iterate_reader.ts?s=iterateReader)
* from
* [`std/streams/iterate_reader.ts`](https://deno.land/std/streams/iterate_reader.ts)
* to turn a `Reader` into an {@linkcode AsyncIterator}.
*/
read(p: Uint8Array): Promise<number | null>;
}
/**
* An abstract interface which when implemented provides an interface to read
* bytes into an array buffer synchronously.
*
* @category I/O */
export interface ReaderSync {
/** Reads up to `p.byteLength` bytes into `p`. It resolves to the number
* of bytes read (`0` < `n` <= `p.byteLength`) and rejects if any error
* encountered. Even if `readSync()` returns `n` < `p.byteLength`, it may use
* all of `p` as scratch space during the call. If some data is available
* but not `p.byteLength` bytes, `readSync()` conventionally returns what is
* available instead of waiting for more.
*
* When `readSync()` encounters end-of-file condition, it returns EOF
* (`null`).
*
* When `readSync()` encounters an error, it throws with an error.
*
* Callers should always process the `n` > `0` bytes returned before
* considering the EOF (`null`). Doing so correctly handles I/O errors that
* happen after reading some bytes and also both of the allowed EOF
* behaviors.
*
* Implementations should not retain a reference to `p`.
*
* Use
* [`itereateReaderSync`](https://deno.land/std/streams/iterate_reader.ts?s=iterateReaderSync)
* from from
* [`std/streams/iterate_reader.ts`](https://deno.land/std/streams/iterate_reader.ts)
* to turn a `ReaderSync` into an {@linkcode Iterator}.
*/
readSync(p: Uint8Array): number | null;
}
/**
* An abstract interface which when implemented provides an interface to write
* bytes from an array buffer to a file/resource asynchronously.
*
* @category I/O */
export interface Writer {
/** Writes `p.byteLength` bytes from `p` to the underlying data stream. It
* resolves to the number of bytes written from `p` (`0` <= `n` <=
* `p.byteLength`) or reject with the error encountered that caused the
* write to stop early. `write()` must reject with a non-null error if
* would resolve to `n` < `p.byteLength`. `write()` must not modify the
* slice data, even temporarily.
*
* This function is one of the lowest
* level APIs and most users should not work with this directly, but rather use
* [`writeAll()`](https://deno.land/std/streams/write_all.ts?s=writeAll) from
* [`std/streams/write_all.ts`](https://deno.land/std/streams/write_all.ts)
* instead.
*
* Implementations should not retain a reference to `p`.
*/
write(p: Uint8Array): Promise<number>;
}
/**
* An abstract interface which when implemented provides an interface to write
* bytes from an array buffer to a file/resource synchronously.
*
* @category I/O */
export interface WriterSync {
/** Writes `p.byteLength` bytes from `p` to the underlying data
* stream. It returns the number of bytes written from `p` (`0` <= `n`
* <= `p.byteLength`) and any error encountered that caused the write to
* stop early. `writeSync()` must throw a non-null error if it returns `n` <
* `p.byteLength`. `writeSync()` must not modify the slice data, even
* temporarily.
*
* Implementations should not retain a reference to `p`.
*/
writeSync(p: Uint8Array): number;
}
/**
* An abstract interface which when implemented provides an interface to close
* files/resources that were previously opened.
*
* @category I/O */
export interface Closer {
/** Closes the resource, "freeing" the backing file/resource. */
close(): void;
}
/**
* An abstract interface which when implemented provides an interface to seek
* within an open file/resource asynchronously.
*
* @category I/O */
export interface Seeker {
/** Seek sets the offset for the next `read()` or `write()` to offset,
* interpreted according to `whence`: `Start` means relative to the
* start of the file, `Current` means relative to the current offset,
* and `End` means relative to the end. Seek resolves to the new offset
* relative to the start of the file.
*
* Seeking to an offset before the start of the file is an error. Seeking to
* any positive offset is legal, but the behavior of subsequent I/O
* operations on the underlying object is implementation-dependent.
*
* It resolves with the updated offset.
*/
seek(offset: number | bigint, whence: SeekMode): Promise<number>;
}
/**
* An abstract interface which when implemented provides an interface to seek
* within an open file/resource synchronously.
*
* @category I/O */
export interface SeekerSync {
/** Seek sets the offset for the next `readSync()` or `writeSync()` to
* offset, interpreted according to `whence`: `Start` means relative
* to the start of the file, `Current` means relative to the current
* offset, and `End` means relative to the end.
*
* Seeking to an offset before the start of the file is an error. Seeking to
* any positive offset is legal, but the behavior of subsequent I/O
* operations on the underlying object is implementation-dependent.
*
* It returns the updated offset.
*/
seekSync(offset: number | bigint, whence: SeekMode): number;
}
/**
* Copies from `src` to `dst` until either EOF (`null`) is read from `src` or
* an error occurs. It resolves to the number of bytes copied or rejects with
* the first error encountered while copying.
*
* @deprecated Use
* [`copy`](https://deno.land/std/streams/copy.ts?s=copy) from
* [`std/streams/copy.ts`](https://deno.land/std/streams/copy.ts)
* instead. `Deno.copy` will be removed in the future.
*
* @category I/O
*
* @param src The source to copy from
* @param dst The destination to copy to
* @param options Can be used to tune size of the buffer. Default size is 32kB
*/
export function copy(
src: Reader,
dst: Writer,
options?: { bufSize?: number },
): Promise<number>;
/**
* Turns a Reader, `r`, into an async iterator.
*
* @deprecated Use
* [`iterateReader`](https://deno.land/std/streams/iterate_reader.ts?s=iterateReader)
* from
* [`std/streams/iterate_reader.ts`](https://deno.land/std/streams/iterate_reader.ts)
* instead. `Deno.iter` will be removed in the future.
*
* @category I/O
*/
export function iter(
r: Reader,
options?: { bufSize?: number },
): AsyncIterableIterator<Uint8Array>;
/**
* Turns a ReaderSync, `r`, into an iterator.
*
* @deprecated Use
* [`iterateReaderSync`](https://deno.land/std/streams/iterate_reader.ts?s=iterateReaderSync)
* from
* [`std/streams/iterate_reader.ts`](https://deno.land/std/streams/iterate_reader.ts)
* instead. `Deno.iterSync` will be removed in the future.
*
* @category I/O
*/
export function iterSync(
r: ReaderSync,
options?: {
bufSize?: number;
},
): IterableIterator<Uint8Array>;
/** Open a file and resolve to an instance of {@linkcode Deno.FsFile}. The
* file does not need to previously exist if using the `create` or `createNew`
* open options. It is the caller's responsibility to close the file when
* finished with it.
*
* ```ts
* const file = await Deno.open("/foo/bar.txt", { read: true, write: true });
* // Do work with file
* file.close();
* ```
*
* Requires `allow-read` and/or `allow-write` permissions depending on
* options.
*
* @tags allow-read, allow-write
* @category File System
*/
export function open(
path: string | URL,
options?: OpenOptions,
): Promise<FsFile>;
/** Synchronously open a file and return an instance of
* {@linkcode Deno.FsFile}. The file does not need to previously exist if
* using the `create` or `createNew` open options. It is the caller's
* responsibility to close the file when finished with it.
*
* ```ts
* const file = Deno.openSync("/foo/bar.txt", { read: true, write: true });
* // Do work with file
* file.close();
* ```
*
* Requires `allow-read` and/or `allow-write` permissions depending on
* options.
*
* @tags allow-read, allow-write
* @category File System
*/
export function openSync(path: string | URL, options?: OpenOptions): FsFile;
/** Creates a file if none exists or truncates an existing file and resolves to
* an instance of {@linkcode Deno.FsFile}.
*
* ```ts
* const file = await Deno.create("/foo/bar.txt");
* ```
*
* Requires `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function create(path: string | URL): Promise<FsFile>;
/** Creates a file if none exists or truncates an existing file and returns
* an instance of {@linkcode Deno.FsFile}.
*
* ```ts
* const file = Deno.createSync("/foo/bar.txt");
* ```
*
* Requires `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function createSync(path: string | URL): FsFile;
/** Read from a resource ID (`rid`) into an array buffer (`buffer`).
*
* Resolves to either the number of bytes read during the operation or EOF
* (`null`) if there was nothing more to read.
*
* It is possible for a read to successfully return with `0` bytes. This does
* not indicate EOF.
*
* This function is one of the lowest level APIs and most users should not
* work with this directly, but rather use {@linkcode ReadableStream} and
* {@linkcode https://deno.land/std/streams/mod.ts?s=toArrayBuffer|toArrayBuffer}
* instead.
*
* **It is not guaranteed that the full buffer will be read in a single call.**
*
* ```ts
* // if "/foo/bar.txt" contains the text "hello world":
* const file = await Deno.open("/foo/bar.txt");
* const buf = new Uint8Array(100);
* const numberOfBytesRead = await Deno.read(file.rid, buf); // 11 bytes
* const text = new TextDecoder().decode(buf); // "hello world"
* Deno.close(file.rid);
* ```
*
* @category I/O
*/
export function read(rid: number, buffer: Uint8Array): Promise<number | null>;
/** Synchronously read from a resource ID (`rid`) into an array buffer
* (`buffer`).
*
* Returns either the number of bytes read during the operation or EOF
* (`null`) if there was nothing more to read.
*
* It is possible for a read to successfully return with `0` bytes. This does
* not indicate EOF.
*
* This function is one of the lowest level APIs and most users should not
* work with this directly, but rather use {@linkcode ReadableStream} and
* {@linkcode https://deno.land/std/streams/mod.ts?s=toArrayBuffer|toArrayBuffer}
* instead.
*
* **It is not guaranteed that the full buffer will be read in a single
* call.**
*
* ```ts
* // if "/foo/bar.txt" contains the text "hello world":
* const file = Deno.openSync("/foo/bar.txt");
* const buf = new Uint8Array(100);
* const numberOfBytesRead = Deno.readSync(file.rid, buf); // 11 bytes
* const text = new TextDecoder().decode(buf); // "hello world"
* Deno.close(file.rid);
* ```
*
* @category I/O
*/
export function readSync(rid: number, buffer: Uint8Array): number | null;
/** Write to the resource ID (`rid`) the contents of the array buffer (`data`).
*
* Resolves to the number of bytes written. This function is one of the lowest
* level APIs and most users should not work with this directly, but rather
* use {@linkcode WritableStream}, {@linkcode ReadableStream.from} and
* {@linkcode ReadableStream.pipeTo}.
*
* **It is not guaranteed that the full buffer will be written in a single
* call.**
*
* ```ts
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world");
* const file = await Deno.open("/foo/bar.txt", { write: true });
* const bytesWritten = await Deno.write(file.rid, data); // 11
* Deno.close(file.rid);
* ```
*
* @category I/O
*/
export function write(rid: number, data: Uint8Array): Promise<number>;
/** Synchronously write to the resource ID (`rid`) the contents of the array
* buffer (`data`).
*
* Returns the number of bytes written. This function is one of the lowest
* level APIs and most users should not work with this directly, but rather
* use {@linkcode WritableStream}, {@linkcode ReadableStream.from} and
* {@linkcode ReadableStream.pipeTo}.
*
* **It is not guaranteed that the full buffer will be written in a single
* call.**
*
* ```ts
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world");
* const file = Deno.openSync("/foo/bar.txt", { write: true });
* const bytesWritten = Deno.writeSync(file.rid, data); // 11
* Deno.close(file.rid);
* ```
*
* @category I/O
*/
export function writeSync(rid: number, data: Uint8Array): number;
/** Seek a resource ID (`rid`) to the given `offset` under mode given by `whence`.
* The call resolves to the new position within the resource (bytes from the start).
*
* ```ts
* // Given file.rid pointing to file with "Hello world", which is 11 bytes long:
* const file = await Deno.open(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* await Deno.write(file.rid, new TextEncoder().encode("Hello world"));
*
* // advance cursor 6 bytes
* const cursorPosition = await Deno.seek(file.rid, 6, Deno.SeekMode.Start);
* console.log(cursorPosition); // 6
* const buf = new Uint8Array(100);
* await file.read(buf);
* console.log(new TextDecoder().decode(buf)); // "world"
* file.close();
* ```
*
* The seek modes work as follows:
*
* ```ts
* // Given file.rid pointing to file with "Hello world", which is 11 bytes long:
* const file = await Deno.open(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* await Deno.write(file.rid, new TextEncoder().encode("Hello world"));
*
* // Seek 6 bytes from the start of the file
* console.log(await Deno.seek(file.rid, 6, Deno.SeekMode.Start)); // "6"
* // Seek 2 more bytes from the current position
* console.log(await Deno.seek(file.rid, 2, Deno.SeekMode.Current)); // "8"
* // Seek backwards 2 bytes from the end of the file
* console.log(await Deno.seek(file.rid, -2, Deno.SeekMode.End)); // "9" (i.e. 11-2)
* file.close();
* ```
*
* @category I/O
*/
export function seek(
rid: number,
offset: number | bigint,
whence: SeekMode,
): Promise<number>;
/** Synchronously seek a resource ID (`rid`) to the given `offset` under mode
* given by `whence`. The new position within the resource (bytes from the
* start) is returned.
*
* ```ts
* const file = Deno.openSync(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* Deno.writeSync(file.rid, new TextEncoder().encode("Hello world"));
*
* // advance cursor 6 bytes
* const cursorPosition = Deno.seekSync(file.rid, 6, Deno.SeekMode.Start);
* console.log(cursorPosition); // 6
* const buf = new Uint8Array(100);
* file.readSync(buf);
* console.log(new TextDecoder().decode(buf)); // "world"
* file.close();
* ```
*
* The seek modes work as follows:
*
* ```ts
* // Given file.rid pointing to file with "Hello world", which is 11 bytes long:
* const file = Deno.openSync(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* Deno.writeSync(file.rid, new TextEncoder().encode("Hello world"));
*
* // Seek 6 bytes from the start of the file
* console.log(Deno.seekSync(file.rid, 6, Deno.SeekMode.Start)); // "6"
* // Seek 2 more bytes from the current position
* console.log(Deno.seekSync(file.rid, 2, Deno.SeekMode.Current)); // "8"
* // Seek backwards 2 bytes from the end of the file
* console.log(Deno.seekSync(file.rid, -2, Deno.SeekMode.End)); // "9" (i.e. 11-2)
* file.close();
* ```
*
* @category I/O
*/
export function seekSync(
rid: number,
offset: number | bigint,
whence: SeekMode,
): number;
/**
* Flushes any pending data and metadata operations of the given file stream
* to disk.
*
* ```ts
* const file = await Deno.open(
* "my_file.txt",
* { read: true, write: true, create: true },
* );
* await Deno.write(file.rid, new TextEncoder().encode("Hello World"));
* await Deno.ftruncate(file.rid, 1);
* await Deno.fsync(file.rid);
* console.log(new TextDecoder().decode(await Deno.readFile("my_file.txt"))); // H
* ```
*
* @category I/O
*/
export function fsync(rid: number): Promise<void>;
/**
* Synchronously flushes any pending data and metadata operations of the given
* file stream to disk.
*
* ```ts
* const file = Deno.openSync(
* "my_file.txt",
* { read: true, write: true, create: true },
* );
* Deno.writeSync(file.rid, new TextEncoder().encode("Hello World"));
* Deno.ftruncateSync(file.rid, 1);
* Deno.fsyncSync(file.rid);
* console.log(new TextDecoder().decode(Deno.readFileSync("my_file.txt"))); // H
* ```
*
* @category I/O
*/
export function fsyncSync(rid: number): void;
/**
* Flushes any pending data operations of the given file stream to disk.
* ```ts
* const file = await Deno.open(
* "my_file.txt",
* { read: true, write: true, create: true },
* );
* await Deno.write(file.rid, new TextEncoder().encode("Hello World"));
* await Deno.fdatasync(file.rid);
* console.log(new TextDecoder().decode(await Deno.readFile("my_file.txt"))); // Hello World
* ```
*
* @category I/O
*/
export function fdatasync(rid: number): Promise<void>;
/**
* Synchronously flushes any pending data operations of the given file stream
* to disk.
*
* ```ts
* const file = Deno.openSync(
* "my_file.txt",
* { read: true, write: true, create: true },
* );
* Deno.writeSync(file.rid, new TextEncoder().encode("Hello World"));
* Deno.fdatasyncSync(file.rid);
* console.log(new TextDecoder().decode(Deno.readFileSync("my_file.txt"))); // Hello World
* ```
*
* @category I/O
*/
export function fdatasyncSync(rid: number): void;
/** Close the given resource ID (`rid`) which has been previously opened, such
* as via opening or creating a file. Closing a file when you are finished
* with it is important to avoid leaking resources.
*
* ```ts
* const file = await Deno.open("my_file.txt");
* // do work with "file" object
* Deno.close(file.rid);
* ```
*
* @category I/O
*/
export function close(rid: number): void;
/** The Deno abstraction for reading and writing files.
*
* This is the most straight forward way of handling files within Deno and is
* recommended over using the discreet functions within the `Deno` namespace.
*
* ```ts
* const file = await Deno.open("/foo/bar.txt", { read: true });
* const fileInfo = await file.stat();
* if (fileInfo.isFile) {
* const buf = new Uint8Array(100);
* const numberOfBytesRead = await file.read(buf); // 11 bytes
* const text = new TextDecoder().decode(buf); // "hello world"
* }
* file.close();
* ```
*
* @category File System
*/
export class FsFile
implements
Reader,
ReaderSync,
Writer,
WriterSync,
Seeker,
SeekerSync,
Closer,
Disposable {
/** The resource ID associated with the file instance. The resource ID
* should be considered an opaque reference to resource. */
readonly rid: number;
/** A {@linkcode ReadableStream} instance representing to the byte contents
* of the file. This makes it easy to interoperate with other web streams
* based APIs.
*
* ```ts
* const file = await Deno.open("my_file.txt", { read: true });
* const decoder = new TextDecoder();
* for await (const chunk of file.readable) {
* console.log(decoder.decode(chunk));
* }
* ```
*/
readonly readable: ReadableStream<Uint8Array>;
/** A {@linkcode WritableStream} instance to write the contents of the
* file. This makes it easy to interoperate with other web streams based
* APIs.
*
* ```ts
* const items = ["hello", "world"];
* const file = await Deno.open("my_file.txt", { write: true });
* const encoder = new TextEncoder();
* const writer = file.writable.getWriter();
* for (const item of items) {
* await writer.write(encoder.encode(item));
* }
* file.close();
* ```
*/
readonly writable: WritableStream<Uint8Array>;
/** The constructor which takes a resource ID. Generally `FsFile` should
* not be constructed directly. Instead use {@linkcode Deno.open} or
* {@linkcode Deno.openSync} to create a new instance of `FsFile`. */
constructor(rid: number);
/** Write the contents of the array buffer (`p`) to the file.
*
* Resolves to the number of bytes written.
*
* **It is not guaranteed that the full buffer will be written in a single
* call.**
*
* ```ts
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world");
* const file = await Deno.open("/foo/bar.txt", { write: true });
* const bytesWritten = await file.write(data); // 11
* file.close();
* ```
*
* @category I/O
*/
write(p: Uint8Array): Promise<number>;
/** Synchronously write the contents of the array buffer (`p`) to the file.
*
* Returns the number of bytes written.
*
* **It is not guaranteed that the full buffer will be written in a single
* call.**
*
* ```ts
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world");
* const file = Deno.openSync("/foo/bar.txt", { write: true });
* const bytesWritten = file.writeSync(data); // 11
* file.close();
* ```
*/
writeSync(p: Uint8Array): number;
/** Truncates (or extends) the file to reach the specified `len`. If `len`
* is not specified, then the entire file contents are truncated.
*
* ### Truncate the entire file
*
* ```ts
* const file = await Deno.open("my_file.txt", { write: true });
* await file.truncate();
* file.close();
* ```
*
* ### Truncate part of the file
*
* ```ts
* // if "my_file.txt" contains the text "hello world":
* const file = await Deno.open("my_file.txt", { write: true });
* await file.truncate(7);
* const buf = new Uint8Array(100);
* await file.read(buf);
* const text = new TextDecoder().decode(buf); // "hello w"
* file.close();
* ```
*/
truncate(len?: number): Promise<void>;
/** Synchronously truncates (or extends) the file to reach the specified
* `len`. If `len` is not specified, then the entire file contents are
* truncated.
*
* ### Truncate the entire file
*
* ```ts
* const file = Deno.openSync("my_file.txt", { write: true });
* file.truncateSync();
* file.close();
* ```
*
* ### Truncate part of the file
*
* ```ts
* // if "my_file.txt" contains the text "hello world":
* const file = Deno.openSync("my_file.txt", { write: true });
* file.truncateSync(7);
* const buf = new Uint8Array(100);
* file.readSync(buf);
* const text = new TextDecoder().decode(buf); // "hello w"
* file.close();
* ```
*/
truncateSync(len?: number): void;
/** Read the file into an array buffer (`p`).
*
* Resolves to either the number of bytes read during the operation or EOF
* (`null`) if there was nothing more to read.
*
* It is possible for a read to successfully return with `0` bytes. This
* does not indicate EOF.
*
* **It is not guaranteed that the full buffer will be read in a single
* call.**
*
* ```ts
* // if "/foo/bar.txt" contains the text "hello world":
* const file = await Deno.open("/foo/bar.txt");
* const buf = new Uint8Array(100);
* const numberOfBytesRead = await file.read(buf); // 11 bytes
* const text = new TextDecoder().decode(buf); // "hello world"
* file.close();
* ```
*/
read(p: Uint8Array): Promise<number | null>;
/** Synchronously read from the file into an array buffer (`p`).
*
* Returns either the number of bytes read during the operation or EOF
* (`null`) if there was nothing more to read.
*
* It is possible for a read to successfully return with `0` bytes. This
* does not indicate EOF.
*
* **It is not guaranteed that the full buffer will be read in a single
* call.**
*
* ```ts
* // if "/foo/bar.txt" contains the text "hello world":
* const file = Deno.openSync("/foo/bar.txt");
* const buf = new Uint8Array(100);
* const numberOfBytesRead = file.readSync(buf); // 11 bytes
* const text = new TextDecoder().decode(buf); // "hello world"
* file.close();
* ```
*/
readSync(p: Uint8Array): number | null;
/** Seek to the given `offset` under mode given by `whence`. The call
* resolves to the new position within the resource (bytes from the start).
*
* ```ts
* // Given file pointing to file with "Hello world", which is 11 bytes long:
* const file = await Deno.open(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* await file.write(new TextEncoder().encode("Hello world"));
*
* // advance cursor 6 bytes
* const cursorPosition = await file.seek(6, Deno.SeekMode.Start);
* console.log(cursorPosition); // 6
* const buf = new Uint8Array(100);
* await file.read(buf);
* console.log(new TextDecoder().decode(buf)); // "world"
* file.close();
* ```
*
* The seek modes work as follows:
*
* ```ts
* // Given file.rid pointing to file with "Hello world", which is 11 bytes long:
* const file = await Deno.open(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* await file.write(new TextEncoder().encode("Hello world"));
*
* // Seek 6 bytes from the start of the file
* console.log(await file.seek(6, Deno.SeekMode.Start)); // "6"
* // Seek 2 more bytes from the current position
* console.log(await file.seek(2, Deno.SeekMode.Current)); // "8"
* // Seek backwards 2 bytes from the end of the file
* console.log(await file.seek(-2, Deno.SeekMode.End)); // "9" (i.e. 11-2)
* ```
*/
seek(offset: number | bigint, whence: SeekMode): Promise<number>;
/** Synchronously seek to the given `offset` under mode given by `whence`.
* The new position within the resource (bytes from the start) is returned.
*
* ```ts
* const file = Deno.openSync(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* file.writeSync(new TextEncoder().encode("Hello world"));
*
* // advance cursor 6 bytes
* const cursorPosition = file.seekSync(6, Deno.SeekMode.Start);
* console.log(cursorPosition); // 6
* const buf = new Uint8Array(100);
* file.readSync(buf);
* console.log(new TextDecoder().decode(buf)); // "world"
* file.close();
* ```
*
* The seek modes work as follows:
*
* ```ts
* // Given file.rid pointing to file with "Hello world", which is 11 bytes long:
* const file = Deno.openSync(
* "hello.txt",
* { read: true, write: true, truncate: true, create: true },
* );
* file.writeSync(new TextEncoder().encode("Hello world"));
*
* // Seek 6 bytes from the start of the file
* console.log(file.seekSync(6, Deno.SeekMode.Start)); // "6"
* // Seek 2 more bytes from the current position
* console.log(file.seekSync(2, Deno.SeekMode.Current)); // "8"
* // Seek backwards 2 bytes from the end of the file
* console.log(file.seekSync(-2, Deno.SeekMode.End)); // "9" (i.e. 11-2)
* file.close();
* ```
*/
seekSync(offset: number | bigint, whence: SeekMode): number;
/** Resolves to a {@linkcode Deno.FileInfo} for the file.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const file = await Deno.open("hello.txt");
* const fileInfo = await file.stat();
* assert(fileInfo.isFile);
* file.close();
* ```
*/
stat(): Promise<FileInfo>;
/** Synchronously returns a {@linkcode Deno.FileInfo} for the file.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const file = Deno.openSync("hello.txt")
* const fileInfo = file.statSync();
* assert(fileInfo.isFile);
* file.close();
* ```
*/
statSync(): FileInfo;
/** Close the file. Closing a file when you are finished with it is
* important to avoid leaking resources.
*
* ```ts
* const file = await Deno.open("my_file.txt");
* // do work with "file" object
* file.close();
* ```
*/
close(): void;
[Symbol.dispose](): void;
}
/**
* The Deno abstraction for reading and writing files.
*
* @deprecated Use {@linkcode Deno.FsFile} instead. `Deno.File` will be
* removed in the future.
* @category File System
*/
export const File: typeof FsFile;
/** Gets the size of the console as columns/rows.
*
* ```ts
* const { columns, rows } = Deno.consoleSize();
* ```
*
* This returns the size of the console window as reported by the operating
* system. It's not a reflection of how many characters will fit within the
* console window, but can be used as part of that calculation.
*
* @category I/O
*/
export function consoleSize(): {
columns: number;
rows: number;
};
/** @category I/O */
export interface SetRawOptions {
/**
* The `cbreak` option can be used to indicate that characters that
* correspond to a signal should still be generated. When disabling raw
* mode, this option is ignored. This functionality currently only works on
* Linux and Mac OS.
*/
cbreak: boolean;
}
/** A reference to `stdin` which can be used to read directly from `stdin`.
* It implements the Deno specific {@linkcode Reader}, {@linkcode ReaderSync},
* and {@linkcode Closer} interfaces as well as provides a
* {@linkcode ReadableStream} interface.
*
* ### Reading chunks from the readable stream
*
* ```ts
* const decoder = new TextDecoder();
* for await (const chunk of Deno.stdin.readable) {
* const text = decoder.decode(chunk);
* // do something with the text
* }
* ```
*
* @category I/O
*/
export const stdin: Reader & ReaderSync & Closer & {
/** The resource ID assigned to `stdin`. This can be used with the discreet
* I/O functions in the `Deno` namespace. */
readonly rid: number;
/** A readable stream interface to `stdin`. */
readonly readable: ReadableStream<Uint8Array>;
/**
* Set TTY to be under raw mode or not. In raw mode, characters are read and
* returned as is, without being processed. All special processing of
* characters by the terminal is disabled, including echoing input
* characters. Reading from a TTY device in raw mode is faster than reading
* from a TTY device in canonical mode.
*
* ```ts
* Deno.stdin.setRaw(true, { cbreak: true });
* ```
*
* @category I/O
*/
setRaw(mode: boolean, options?: SetRawOptions): void;
};
/** A reference to `stdout` which can be used to write directly to `stdout`.
* It implements the Deno specific {@linkcode Writer}, {@linkcode WriterSync},
* and {@linkcode Closer} interfaces as well as provides a
* {@linkcode WritableStream} interface.
*
* These are low level constructs, and the {@linkcode console} interface is a
* more straight forward way to interact with `stdout` and `stderr`.
*
* @category I/O
*/
export const stdout: Writer & WriterSync & Closer & {
/** The resource ID assigned to `stdout`. This can be used with the discreet
* I/O functions in the `Deno` namespace. */
readonly rid: number;
/** A writable stream interface to `stdout`. */
readonly writable: WritableStream<Uint8Array>;
};
/** A reference to `stderr` which can be used to write directly to `stderr`.
* It implements the Deno specific {@linkcode Writer}, {@linkcode WriterSync},
* and {@linkcode Closer} interfaces as well as provides a
* {@linkcode WritableStream} interface.
*
* These are low level constructs, and the {@linkcode console} interface is a
* more straight forward way to interact with `stdout` and `stderr`.
*
* @category I/O
*/
export const stderr: Writer & WriterSync & Closer & {
/** The resource ID assigned to `stderr`. This can be used with the discreet
* I/O functions in the `Deno` namespace. */
readonly rid: number;
/** A writable stream interface to `stderr`. */
readonly writable: WritableStream<Uint8Array>;
};
/**
* Options which can be set when doing {@linkcode Deno.open} and
* {@linkcode Deno.openSync}.
*
* @category File System */
export interface OpenOptions {
/** Sets the option for read access. This option, when `true`, means that
* the file should be read-able if opened.
*
* @default {true} */
read?: boolean;
/** Sets the option for write access. This option, when `true`, means that
* the file should be write-able if opened. If the file already exists,
* any write calls on it will overwrite its contents, by default without
* truncating it.
*
* @default {false} */
write?: boolean;
/** Sets the option for the append mode. This option, when `true`, means
* that writes will append to a file instead of overwriting previous
* contents.
*
* Note that setting `{ write: true, append: true }` has the same effect as
* setting only `{ append: true }`.
*
* @default {false} */
append?: boolean;
/** Sets the option for truncating a previous file. If a file is
* successfully opened with this option set it will truncate the file to `0`
* size if it already exists. The file must be opened with write access
* for truncate to work.
*
* @default {false} */
truncate?: boolean;
/** Sets the option to allow creating a new file, if one doesn't already
* exist at the specified path. Requires write or append access to be
* used.
*
* @default {false} */
create?: boolean;
/** If set to `true`, no file, directory, or symlink is allowed to exist at
* the target location. Requires write or append access to be used. When
* createNew is set to `true`, create and truncate are ignored.
*
* @default {false} */
createNew?: boolean;
/** Permissions to use if creating the file (defaults to `0o666`, before
* the process's umask).
*
* Ignored on Windows. */
mode?: number;
}
/**
* Options which can be set when using {@linkcode Deno.readFile} or
* {@linkcode Deno.readFileSync}.
*
* @category File System */
export interface ReadFileOptions {
/**
* An abort signal to allow cancellation of the file read operation.
* If the signal becomes aborted the readFile operation will be stopped
* and the promise returned will be rejected with an AbortError.
*/
signal?: AbortSignal;
}
/**
* Check if a given resource id (`rid`) is a TTY (a terminal).
*
* ```ts
* // This example is system and context specific
* const nonTTYRid = Deno.openSync("my_file.txt").rid;
* const ttyRid = Deno.openSync("/dev/tty6").rid;
* console.log(Deno.isatty(nonTTYRid)); // false
* console.log(Deno.isatty(ttyRid)); // true
* Deno.close(nonTTYRid);
* Deno.close(ttyRid);
* ```
*
* @category I/O
*/
export function isatty(rid: number): boolean;
/**
* A variable-sized buffer of bytes with `read()` and `write()` methods.
*
* @deprecated Use [`Buffer`](https://deno.land/std/io/buffer.ts?s=Buffer)
* from [`std/io/buffer.ts`](https://deno.land/std/io/buffer.ts) instead.
* `Deno.Buffer` will be removed in the future.
*
* @category I/O
*/
export class Buffer implements Reader, ReaderSync, Writer, WriterSync {
constructor(ab?: ArrayBuffer);
/** Returns a slice holding the unread portion of the buffer.
*
* The slice is valid for use only until the next buffer modification (that
* is, only until the next call to a method like `read()`, `write()`,
* `reset()`, or `truncate()`). If `options.copy` is false the slice aliases the buffer content at
* least until the next buffer modification, so immediate changes to the
* slice will affect the result of future reads.
* @param options Defaults to `{ copy: true }`
*/
bytes(options?: { copy?: boolean }): Uint8Array;
/** Returns whether the unread portion of the buffer is empty. */
empty(): boolean;
/** A read only number of bytes of the unread portion of the buffer. */
readonly length: number;
/** The read only capacity of the buffer's underlying byte slice, that is,
* the total space allocated for the buffer's data. */
readonly capacity: number;
/** Discards all but the first `n` unread bytes from the buffer but
* continues to use the same allocated storage. It throws if `n` is
* negative or greater than the length of the buffer. */
truncate(n: number): void;
/** Resets the buffer to be empty, but it retains the underlying storage for
* use by future writes. `.reset()` is the same as `.truncate(0)`. */
reset(): void;
/** Reads the next `p.length` bytes from the buffer or until the buffer is
* drained. Returns the number of bytes read. If the buffer has no data to
* return, the return is EOF (`null`). */
readSync(p: Uint8Array): number | null;
/** Reads the next `p.length` bytes from the buffer or until the buffer is
* drained. Resolves to the number of bytes read. If the buffer has no
* data to return, resolves to EOF (`null`).
*
* NOTE: This methods reads bytes synchronously; it's provided for
* compatibility with `Reader` interfaces.
*/
read(p: Uint8Array): Promise<number | null>;
writeSync(p: Uint8Array): number;
/** NOTE: This methods writes bytes synchronously; it's provided for
* compatibility with `Writer` interface. */
write(p: Uint8Array): Promise<number>;
/** Grows the buffer's capacity, if necessary, to guarantee space for
* another `n` bytes. After `.grow(n)`, at least `n` bytes can be written to
* the buffer without another allocation. If `n` is negative, `.grow()` will
* throw. If the buffer can't grow it will throw an error.
*
* Based on Go Lang's
* [Buffer.Grow](https://golang.org/pkg/bytes/#Buffer.Grow). */
grow(n: number): void;
/** Reads data from `r` until EOF (`null`) and appends it to the buffer,
* growing the buffer as needed. It resolves to the number of bytes read.
* If the buffer becomes too large, `.readFrom()` will reject with an error.
*
* Based on Go Lang's
* [Buffer.ReadFrom](https://golang.org/pkg/bytes/#Buffer.ReadFrom). */
readFrom(r: Reader): Promise<number>;
/** Reads data from `r` until EOF (`null`) and appends it to the buffer,
* growing the buffer as needed. It returns the number of bytes read. If the
* buffer becomes too large, `.readFromSync()` will throw an error.
*
* Based on Go Lang's
* [Buffer.ReadFrom](https://golang.org/pkg/bytes/#Buffer.ReadFrom). */
readFromSync(r: ReaderSync): number;
}
/**
* Read Reader `r` until EOF (`null`) and resolve to the content as
* Uint8Array`.
*
* @deprecated Use
* [`readAll`](https://deno.land/std/streams/read_all.ts?s=readAll) from
* [`std/streams/read_all.ts`](https://deno.land/std/streams/read_all.ts)
* instead. `Deno.readAll` will be removed in the future.
*
* @category I/O
*/
export function readAll(r: Reader): Promise<Uint8Array>;
/**
* Synchronously reads Reader `r` until EOF (`null`) and returns the content
* as `Uint8Array`.
*
* @deprecated Use
* [`readAllSync`](https://deno.land/std/streams/read_all.ts?s=readAllSync)
* from
* [`std/streams/read_all.ts`](https://deno.land/std/streams/read_all.ts)
* instead. `Deno.readAllSync` will be removed in the future.
*
* @category I/O
*/
export function readAllSync(r: ReaderSync): Uint8Array;
/**
* Write all the content of the array buffer (`arr`) to the writer (`w`).
*
* @deprecated Use
* [`writeAll`](https://deno.land/std/streams/write_all.ts?s=writeAll) from
* [`std/streams/write_all.ts`](https://deno.land/std/streams/write_all.ts)
* instead. `Deno.writeAll` will be removed in the future.
*
* @category I/O
*/
export function writeAll(w: Writer, arr: Uint8Array): Promise<void>;
/**
* Synchronously write all the content of the array buffer (`arr`) to the
* writer (`w`).
*
* @deprecated Use
* [`writeAllSync`](https://deno.land/std/streams/write_all.ts?s=writeAllSync)
* from
* [`std/streams/write_all.ts`](https://deno.land/std/streams/write_all.ts)
* instead. `Deno.writeAllSync` will be removed in the future.
*
* @category I/O
*/
export function writeAllSync(w: WriterSync, arr: Uint8Array): void;
/**
* Options which can be set when using {@linkcode Deno.mkdir} and
* {@linkcode Deno.mkdirSync}.
*
* @category File System */
export interface MkdirOptions {
/** If set to `true`, means that any intermediate directories will also be
* created (as with the shell command `mkdir -p`).
*
* Intermediate directories are created with the same permissions.
*
* When recursive is set to `true`, succeeds silently (without changing any
* permissions) if a directory already exists at the path, or if the path
* is a symlink to an existing directory.
*
* @default {false} */
recursive?: boolean;
/** Permissions to use when creating the directory (defaults to `0o777`,
* before the process's umask).
*
* Ignored on Windows. */
mode?: number;
}
/** Creates a new directory with the specified path.
*
* ```ts
* await Deno.mkdir("new_dir");
* await Deno.mkdir("nested/directories", { recursive: true });
* await Deno.mkdir("restricted_access_dir", { mode: 0o700 });
* ```
*
* Defaults to throwing error if the directory already exists.
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function mkdir(
path: string | URL,
options?: MkdirOptions,
): Promise<void>;
/** Synchronously creates a new directory with the specified path.
*
* ```ts
* Deno.mkdirSync("new_dir");
* Deno.mkdirSync("nested/directories", { recursive: true });
* Deno.mkdirSync("restricted_access_dir", { mode: 0o700 });
* ```
*
* Defaults to throwing error if the directory already exists.
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function mkdirSync(path: string | URL, options?: MkdirOptions): void;
/**
* Options which can be set when using {@linkcode Deno.makeTempDir},
* {@linkcode Deno.makeTempDirSync}, {@linkcode Deno.makeTempFile}, and
* {@linkcode Deno.makeTempFileSync}.
*
* @category File System */
export interface MakeTempOptions {
/** Directory where the temporary directory should be created (defaults to
* the env variable `TMPDIR`, or the system's default, usually `/tmp`).
*
* Note that if the passed `dir` is relative, the path returned by
* `makeTempFile()` and `makeTempDir()` will also be relative. Be mindful of
* this when changing working directory. */
dir?: string;
/** String that should precede the random portion of the temporary
* directory's name. */
prefix?: string;
/** String that should follow the random portion of the temporary
* directory's name. */
suffix?: string;
}
/** Creates a new temporary directory in the default directory for temporary
* files, unless `dir` is specified. Other optional options include
* prefixing and suffixing the directory name with `prefix` and `suffix`
* respectively.
*
* This call resolves to the full path to the newly created directory.
*
* Multiple programs calling this function simultaneously will create different
* directories. It is the caller's responsibility to remove the directory when
* no longer needed.
*
* ```ts
* const tempDirName0 = await Deno.makeTempDir(); // e.g. /tmp/2894ea76
* const tempDirName1 = await Deno.makeTempDir({ prefix: 'my_temp' }); // e.g. /tmp/my_temp339c944d
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
// TODO(ry) Doesn't check permissions.
export function makeTempDir(options?: MakeTempOptions): Promise<string>;
/** Synchronously creates a new temporary directory in the default directory
* for temporary files, unless `dir` is specified. Other optional options
* include prefixing and suffixing the directory name with `prefix` and
* `suffix` respectively.
*
* The full path to the newly created directory is returned.
*
* Multiple programs calling this function simultaneously will create different
* directories. It is the caller's responsibility to remove the directory when
* no longer needed.
*
* ```ts
* const tempDirName0 = Deno.makeTempDirSync(); // e.g. /tmp/2894ea76
* const tempDirName1 = Deno.makeTempDirSync({ prefix: 'my_temp' }); // e.g. /tmp/my_temp339c944d
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
// TODO(ry) Doesn't check permissions.
export function makeTempDirSync(options?: MakeTempOptions): string;
/** Creates a new temporary file in the default directory for temporary
* files, unless `dir` is specified.
*
* Other options include prefixing and suffixing the directory name with
* `prefix` and `suffix` respectively.
*
* This call resolves to the full path to the newly created file.
*
* Multiple programs calling this function simultaneously will create
* different files. It is the caller's responsibility to remove the file when
* no longer needed.
*
* ```ts
* const tmpFileName0 = await Deno.makeTempFile(); // e.g. /tmp/419e0bf2
* const tmpFileName1 = await Deno.makeTempFile({ prefix: 'my_temp' }); // e.g. /tmp/my_temp754d3098
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function makeTempFile(options?: MakeTempOptions): Promise<string>;
/** Synchronously creates a new temporary file in the default directory for
* temporary files, unless `dir` is specified.
*
* Other options include prefixing and suffixing the directory name with
* `prefix` and `suffix` respectively.
*
* The full path to the newly created file is returned.
*
* Multiple programs calling this function simultaneously will create
* different files. It is the caller's responsibility to remove the file when
* no longer needed.
*
* ```ts
* const tempFileName0 = Deno.makeTempFileSync(); // e.g. /tmp/419e0bf2
* const tempFileName1 = Deno.makeTempFileSync({ prefix: 'my_temp' }); // e.g. /tmp/my_temp754d3098
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function makeTempFileSync(options?: MakeTempOptions): string;
/** Changes the permission of a specific file/directory of specified path.
* Ignores the process's umask.
*
* ```ts
* await Deno.chmod("/path/to/file", 0o666);
* ```
*
* The mode is a sequence of 3 octal numbers. The first/left-most number
* specifies the permissions for the owner. The second number specifies the
* permissions for the group. The last/right-most number specifies the
* permissions for others. For example, with a mode of 0o764, the owner (7)
* can read/write/execute, the group (6) can read/write and everyone else (4)
* can read only.
*
* | Number | Description |
* | ------ | ----------- |
* | 7 | read, write, and execute |
* | 6 | read and write |
* | 5 | read and execute |
* | 4 | read only |
* | 3 | write and execute |
* | 2 | write only |
* | 1 | execute only |
* | 0 | no permission |
*
* NOTE: This API currently throws on Windows
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function chmod(path: string | URL, mode: number): Promise<void>;
/** Synchronously changes the permission of a specific file/directory of
* specified path. Ignores the process's umask.
*
* ```ts
* Deno.chmodSync("/path/to/file", 0o666);
* ```
*
* For a full description, see {@linkcode Deno.chmod}.
*
* NOTE: This API currently throws on Windows
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function chmodSync(path: string | URL, mode: number): void;
/** Change owner of a regular file or directory.
*
* This functionality is not available on Windows.
*
* ```ts
* await Deno.chown("myFile.txt", 1000, 1002);
* ```
*
* Requires `allow-write` permission.
*
* Throws Error (not implemented) if executed on Windows.
*
* @tags allow-write
* @category File System
*
* @param path path to the file
* @param uid user id (UID) of the new owner, or `null` for no change
* @param gid group id (GID) of the new owner, or `null` for no change
*/
export function chown(
path: string | URL,
uid: number | null,
gid: number | null,
): Promise<void>;
/** Synchronously change owner of a regular file or directory.
*
* This functionality is not available on Windows.
*
* ```ts
* Deno.chownSync("myFile.txt", 1000, 1002);
* ```
*
* Requires `allow-write` permission.
*
* Throws Error (not implemented) if executed on Windows.
*
* @tags allow-write
* @category File System
*
* @param path path to the file
* @param uid user id (UID) of the new owner, or `null` for no change
* @param gid group id (GID) of the new owner, or `null` for no change
*/
export function chownSync(
path: string | URL,
uid: number | null,
gid: number | null,
): void;
/**
* Options which can be set when using {@linkcode Deno.remove} and
* {@linkcode Deno.removeSync}.
*
* @category File System */
export interface RemoveOptions {
/** If set to `true`, path will be removed even if it's a non-empty directory.
*
* @default {false} */
recursive?: boolean;
}
/** Removes the named file or directory.
*
* ```ts
* await Deno.remove("/path/to/empty_dir/or/file");
* await Deno.remove("/path/to/populated_dir/or/file", { recursive: true });
* ```
*
* Throws error if permission denied, path not found, or path is a non-empty
* directory and the `recursive` option isn't set to `true`.
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function remove(
path: string | URL,
options?: RemoveOptions,
): Promise<void>;
/** Synchronously removes the named file or directory.
*
* ```ts
* Deno.removeSync("/path/to/empty_dir/or/file");
* Deno.removeSync("/path/to/populated_dir/or/file", { recursive: true });
* ```
*
* Throws error if permission denied, path not found, or path is a non-empty
* directory and the `recursive` option isn't set to `true`.
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function removeSync(path: string | URL, options?: RemoveOptions): void;
/** Synchronously renames (moves) `oldpath` to `newpath`. Paths may be files or
* directories. If `newpath` already exists and is not a directory,
* `renameSync()` replaces it. OS-specific restrictions may apply when
* `oldpath` and `newpath` are in different directories.
*
* ```ts
* Deno.renameSync("old/path", "new/path");
* ```
*
* On Unix-like OSes, this operation does not follow symlinks at either path.
*
* It varies between platforms when the operation throws errors, and if so what
* they are. It's always an error to rename anything to a non-empty directory.
*
* Requires `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function renameSync(
oldpath: string | URL,
newpath: string | URL,
): void;
/** Renames (moves) `oldpath` to `newpath`. Paths may be files or directories.
* If `newpath` already exists and is not a directory, `rename()` replaces it.
* OS-specific restrictions may apply when `oldpath` and `newpath` are in
* different directories.
*
* ```ts
* await Deno.rename("old/path", "new/path");
* ```
*
* On Unix-like OSes, this operation does not follow symlinks at either path.
*
* It varies between platforms when the operation throws errors, and if so
* what they are. It's always an error to rename anything to a non-empty
* directory.
*
* Requires `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function rename(
oldpath: string | URL,
newpath: string | URL,
): Promise<void>;
/** Asynchronously reads and returns the entire contents of a file as an UTF-8
* decoded string. Reading a directory throws an error.
*
* ```ts
* const data = await Deno.readTextFile("hello.txt");
* console.log(data);
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readTextFile(
path: string | URL,
options?: ReadFileOptions,
): Promise<string>;
/** Synchronously reads and returns the entire contents of a file as an UTF-8
* decoded string. Reading a directory throws an error.
*
* ```ts
* const data = Deno.readTextFileSync("hello.txt");
* console.log(data);
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readTextFileSync(path: string | URL): string;
/** Reads and resolves to the entire contents of a file as an array of bytes.
* `TextDecoder` can be used to transform the bytes to string if required.
* Reading a directory returns an empty data array.
*
* ```ts
* const decoder = new TextDecoder("utf-8");
* const data = await Deno.readFile("hello.txt");
* console.log(decoder.decode(data));
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readFile(
path: string | URL,
options?: ReadFileOptions,
): Promise<Uint8Array>;
/** Synchronously reads and returns the entire contents of a file as an array
* of bytes. `TextDecoder` can be used to transform the bytes to string if
* required. Reading a directory returns an empty data array.
*
* ```ts
* const decoder = new TextDecoder("utf-8");
* const data = Deno.readFileSync("hello.txt");
* console.log(decoder.decode(data));
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readFileSync(path: string | URL): Uint8Array;
/** Provides information about a file and is returned by
* {@linkcode Deno.stat}, {@linkcode Deno.lstat}, {@linkcode Deno.statSync},
* and {@linkcode Deno.lstatSync} or from calling `stat()` and `statSync()`
* on an {@linkcode Deno.FsFile} instance.
*
* @category File System
*/
export interface FileInfo {
/** True if this is info for a regular file. Mutually exclusive to
* `FileInfo.isDirectory` and `FileInfo.isSymlink`. */
isFile: boolean;
/** True if this is info for a regular directory. Mutually exclusive to
* `FileInfo.isFile` and `FileInfo.isSymlink`. */
isDirectory: boolean;
/** True if this is info for a symlink. Mutually exclusive to
* `FileInfo.isFile` and `FileInfo.isDirectory`. */
isSymlink: boolean;
/** The size of the file, in bytes. */
size: number;
/** The last modification time of the file. This corresponds to the `mtime`
* field from `stat` on Linux/Mac OS and `ftLastWriteTime` on Windows. This
* may not be available on all platforms. */
mtime: Date | null;
/** The last access time of the file. This corresponds to the `atime`
* field from `stat` on Unix and `ftLastAccessTime` on Windows. This may not
* be available on all platforms. */
atime: Date | null;
/** The creation time of the file. This corresponds to the `birthtime`
* field from `stat` on Mac/BSD and `ftCreationTime` on Windows. This may
* not be available on all platforms. */
birthtime: Date | null;
/** ID of the device containing the file. */
dev: number;
/** Inode number.
*
* _Linux/Mac OS only._ */
ino: number | null;
/** **UNSTABLE**: Match behavior with Go on Windows for `mode`.
*
* The underlying raw `st_mode` bits that contain the standard Unix
* permissions for this file/directory. */
mode: number | null;
/** Number of hard links pointing to this file.
*
* _Linux/Mac OS only._ */
nlink: number | null;
/** User ID of the owner of this file.
*
* _Linux/Mac OS only._ */
uid: number | null;
/** Group ID of the owner of this file.
*
* _Linux/Mac OS only._ */
gid: number | null;
/** Device ID of this file.
*
* _Linux/Mac OS only._ */
rdev: number | null;
/** Blocksize for filesystem I/O.
*
* _Linux/Mac OS only._ */
blksize: number | null;
/** Number of blocks allocated to the file, in 512-byte units.
*
* _Linux/Mac OS only._ */
blocks: number | null;
/** True if this is info for a block device.
*
* _Linux/Mac OS only._ */
isBlockDevice: boolean | null;
/** True if this is info for a char device.
*
* _Linux/Mac OS only._ */
isCharDevice: boolean | null;
/** True if this is info for a fifo.
*
* _Linux/Mac OS only._ */
isFifo: boolean | null;
/** True if this is info for a socket.
*
* _Linux/Mac OS only._ */
isSocket: boolean | null;
}
/** Resolves to the absolute normalized path, with symbolic links resolved.
*
* ```ts
* // e.g. given /home/alice/file.txt and current directory /home/alice
* await Deno.symlink("file.txt", "symlink_file.txt");
* const realPath = await Deno.realPath("./file.txt");
* const realSymLinkPath = await Deno.realPath("./symlink_file.txt");
* console.log(realPath); // outputs "/home/alice/file.txt"
* console.log(realSymLinkPath); // outputs "/home/alice/file.txt"
* ```
*
* Requires `allow-read` permission for the target path.
*
* Also requires `allow-read` permission for the `CWD` if the target path is
* relative.
*
* @tags allow-read
* @category File System
*/
export function realPath(path: string | URL): Promise<string>;
/** Synchronously returns absolute normalized path, with symbolic links
* resolved.
*
* ```ts
* // e.g. given /home/alice/file.txt and current directory /home/alice
* Deno.symlinkSync("file.txt", "symlink_file.txt");
* const realPath = Deno.realPathSync("./file.txt");
* const realSymLinkPath = Deno.realPathSync("./symlink_file.txt");
* console.log(realPath); // outputs "/home/alice/file.txt"
* console.log(realSymLinkPath); // outputs "/home/alice/file.txt"
* ```
*
* Requires `allow-read` permission for the target path.
*
* Also requires `allow-read` permission for the `CWD` if the target path is
* relative.
*
* @tags allow-read
* @category File System
*/
export function realPathSync(path: string | URL): string;
/**
* Information about a directory entry returned from {@linkcode Deno.readDir}
* and {@linkcode Deno.readDirSync}.
*
* @category File System */
export interface DirEntry {
/** The file name of the entry. It is just the entity name and does not
* include the full path. */
name: string;
/** True if this is info for a regular file. Mutually exclusive to
* `DirEntry.isDirectory` and `DirEntry.isSymlink`. */
isFile: boolean;
/** True if this is info for a regular directory. Mutually exclusive to
* `DirEntry.isFile` and `DirEntry.isSymlink`. */
isDirectory: boolean;
/** True if this is info for a symlink. Mutually exclusive to
* `DirEntry.isFile` and `DirEntry.isDirectory`. */
isSymlink: boolean;
}
/** Reads the directory given by `path` and returns an async iterable of
* {@linkcode Deno.DirEntry}.
*
* ```ts
* for await (const dirEntry of Deno.readDir("/")) {
* console.log(dirEntry.name);
* }
* ```
*
* Throws error if `path` is not a directory.
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readDir(path: string | URL): AsyncIterable<DirEntry>;
/** Synchronously reads the directory given by `path` and returns an iterable
* of `Deno.DirEntry`.
*
* ```ts
* for (const dirEntry of Deno.readDirSync("/")) {
* console.log(dirEntry.name);
* }
* ```
*
* Throws error if `path` is not a directory.
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readDirSync(path: string | URL): Iterable<DirEntry>;
/** Copies the contents and permissions of one file to another specified path,
* by default creating a new file if needed, else overwriting. Fails if target
* path is a directory or is unwritable.
*
* ```ts
* await Deno.copyFile("from.txt", "to.txt");
* ```
*
* Requires `allow-read` permission on `fromPath`.
*
* Requires `allow-write` permission on `toPath`.
*
* @tags allow-read, allow-write
* @category File System
*/
export function copyFile(
fromPath: string | URL,
toPath: string | URL,
): Promise<void>;
/** Synchronously copies the contents and permissions of one file to another
* specified path, by default creating a new file if needed, else overwriting.
* Fails if target path is a directory or is unwritable.
*
* ```ts
* Deno.copyFileSync("from.txt", "to.txt");
* ```
*
* Requires `allow-read` permission on `fromPath`.
*
* Requires `allow-write` permission on `toPath`.
*
* @tags allow-read, allow-write
* @category File System
*/
export function copyFileSync(
fromPath: string | URL,
toPath: string | URL,
): void;
/** Resolves to the full path destination of the named symbolic link.
*
* ```ts
* await Deno.symlink("./test.txt", "./test_link.txt");
* const target = await Deno.readLink("./test_link.txt"); // full path of ./test.txt
* ```
*
* Throws TypeError if called with a hard link.
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readLink(path: string | URL): Promise<string>;
/** Synchronously returns the full path destination of the named symbolic
* link.
*
* ```ts
* Deno.symlinkSync("./test.txt", "./test_link.txt");
* const target = Deno.readLinkSync("./test_link.txt"); // full path of ./test.txt
* ```
*
* Throws TypeError if called with a hard link.
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function readLinkSync(path: string | URL): string;
/** Resolves to a {@linkcode Deno.FileInfo} for the specified `path`. If
* `path` is a symlink, information for the symlink will be returned instead
* of what it points to.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
* const fileInfo = await Deno.lstat("hello.txt");
* assert(fileInfo.isFile);
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function lstat(path: string | URL): Promise<FileInfo>;
/** Synchronously returns a {@linkcode Deno.FileInfo} for the specified
* `path`. If `path` is a symlink, information for the symlink will be
* returned instead of what it points to.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
* const fileInfo = Deno.lstatSync("hello.txt");
* assert(fileInfo.isFile);
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function lstatSync(path: string | URL): FileInfo;
/** Resolves to a {@linkcode Deno.FileInfo} for the specified `path`. Will
* always follow symlinks.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
* const fileInfo = await Deno.stat("hello.txt");
* assert(fileInfo.isFile);
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function stat(path: string | URL): Promise<FileInfo>;
/** Synchronously returns a {@linkcode Deno.FileInfo} for the specified
* `path`. Will always follow symlinks.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
* const fileInfo = Deno.statSync("hello.txt");
* assert(fileInfo.isFile);
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function statSync(path: string | URL): FileInfo;
/** Options for writing to a file.
*
* @category File System
*/
export interface WriteFileOptions {
/** If set to `true`, will append to a file instead of overwriting previous
* contents.
*
* @default {false} */
append?: boolean;
/** Sets the option to allow creating a new file, if one doesn't already
* exist at the specified path.
*
* @default {true} */
create?: boolean;
/** If set to `true`, no file, directory, or symlink is allowed to exist at
* the target location. When createNew is set to `true`, `create` is ignored.
*
* @default {false} */
createNew?: boolean;
/** Permissions always applied to file. */
mode?: number;
/** An abort signal to allow cancellation of the file write operation.
*
* If the signal becomes aborted the write file operation will be stopped
* and the promise returned will be rejected with an {@linkcode AbortError}.
*/
signal?: AbortSignal;
}
/** Write `data` to the given `path`, by default creating a new file if
* needed, else overwriting.
*
* ```ts
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world\n");
* await Deno.writeFile("hello1.txt", data); // overwrite "hello1.txt" or create it
* await Deno.writeFile("hello2.txt", data, { create: false }); // only works if "hello2.txt" exists
* await Deno.writeFile("hello3.txt", data, { mode: 0o777 }); // set permissions on new file
* await Deno.writeFile("hello4.txt", data, { append: true }); // add data to the end of the file
* ```
*
* Requires `allow-write` permission, and `allow-read` if `options.create` is
* `false`.
*
* @tags allow-read, allow-write
* @category File System
*/
export function writeFile(
path: string | URL,
data: Uint8Array | ReadableStream<Uint8Array>,
options?: WriteFileOptions,
): Promise<void>;
/** Synchronously write `data` to the given `path`, by default creating a new
* file if needed, else overwriting.
*
* ```ts
* const encoder = new TextEncoder();
* const data = encoder.encode("Hello world\n");
* Deno.writeFileSync("hello1.txt", data); // overwrite "hello1.txt" or create it
* Deno.writeFileSync("hello2.txt", data, { create: false }); // only works if "hello2.txt" exists
* Deno.writeFileSync("hello3.txt", data, { mode: 0o777 }); // set permissions on new file
* Deno.writeFileSync("hello4.txt", data, { append: true }); // add data to the end of the file
* ```
*
* Requires `allow-write` permission, and `allow-read` if `options.create` is
* `false`.
*
* @tags allow-read, allow-write
* @category File System
*/
export function writeFileSync(
path: string | URL,
data: Uint8Array,
options?: WriteFileOptions,
): void;
/** Write string `data` to the given `path`, by default creating a new file if
* needed, else overwriting.
*
* ```ts
* await Deno.writeTextFile("hello1.txt", "Hello world\n"); // overwrite "hello1.txt" or create it
* ```
*
* Requires `allow-write` permission, and `allow-read` if `options.create` is
* `false`.
*
* @tags allow-read, allow-write
* @category File System
*/
export function writeTextFile(
path: string | URL,
data: string | ReadableStream<string>,
options?: WriteFileOptions,
): Promise<void>;
/** Synchronously write string `data` to the given `path`, by default creating
* a new file if needed, else overwriting.
*
* ```ts
* Deno.writeTextFileSync("hello1.txt", "Hello world\n"); // overwrite "hello1.txt" or create it
* ```
*
* Requires `allow-write` permission, and `allow-read` if `options.create` is
* `false`.
*
* @tags allow-read, allow-write
* @category File System
*/
export function writeTextFileSync(
path: string | URL,
data: string,
options?: WriteFileOptions,
): void;
/** Truncates (or extends) the specified file, to reach the specified `len`.
* If `len` is not specified then the entire file contents are truncated.
*
* ### Truncate the entire file
* ```ts
* await Deno.truncate("my_file.txt");
* ```
*
* ### Truncate part of the file
*
* ```ts
* const file = await Deno.makeTempFile();
* await Deno.writeFile(file, new TextEncoder().encode("Hello World"));
* await Deno.truncate(file, 7);
* const data = await Deno.readFile(file);
* console.log(new TextDecoder().decode(data)); // "Hello W"
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function truncate(name: string, len?: number): Promise<void>;
/** Synchronously truncates (or extends) the specified file, to reach the
* specified `len`. If `len` is not specified then the entire file contents
* are truncated.
*
* ### Truncate the entire file
*
* ```ts
* Deno.truncateSync("my_file.txt");
* ```
*
* ### Truncate part of the file
*
* ```ts
* const file = Deno.makeTempFileSync();
* Deno.writeFileSync(file, new TextEncoder().encode("Hello World"));
* Deno.truncateSync(file, 7);
* const data = Deno.readFileSync(file);
* console.log(new TextDecoder().decode(data));
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function truncateSync(name: string, len?: number): void;
/** @category Observability
*
* @deprecated This API has been deprecated in Deno v1.37.1.
*/
export interface OpMetrics {
opsDispatched: number;
opsDispatchedSync: number;
opsDispatchedAsync: number;
opsDispatchedAsyncUnref: number;
opsCompleted: number;
opsCompletedSync: number;
opsCompletedAsync: number;
opsCompletedAsyncUnref: number;
bytesSentControl: number;
bytesSentData: number;
bytesReceived: number;
}
/** @category Observability
*
* @deprecated This API has been deprecated in Deno v1.37.1.
*/
export interface Metrics extends OpMetrics {
ops: Record<string, OpMetrics>;
}
/** Receive metrics from the privileged side of Deno. This is primarily used
* in the development of Deno. _Ops_, also called _bindings_, are the
* go-between between Deno JavaScript sandbox and the rest of Deno.
*
* ```shell
* > console.table(Deno.metrics())
* ┌─────────────────────────┬────────┐
* │ (index) │ Values │
* ├─────────────────────────┼────────┤
* │ opsDispatched │ 3 │
* │ opsDispatchedSync │ 2 │
* │ opsDispatchedAsync │ 1 │
* │ opsDispatchedAsyncUnref │ 0 │
* │ opsCompleted │ 3 │
* │ opsCompletedSync │ 2 │
* │ opsCompletedAsync │ 1 │
* │ opsCompletedAsyncUnref │ 0 │
* │ bytesSentControl │ 73 │
* │ bytesSentData │ 0 │
* │ bytesReceived │ 375 │
* └─────────────────────────┴────────┘
* ```
*
* @category Observability
*
* @deprecated This API has been deprecated in Deno v1.37.1.
*/
export function metrics(): Metrics;
/**
* A map of open resources that Deno is tracking. The key is the resource ID
* (_rid_) and the value is its representation.
*
* @category Observability */
interface ResourceMap {
[rid: number]: unknown;
}
/** Returns a map of open resource IDs (_rid_) along with their string
* representations. This is an internal API and as such resource
* representation has `unknown` type; that means it can change any time and
* should not be depended upon.
*
* ```ts
* console.log(Deno.resources());
* // { 0: "stdin", 1: "stdout", 2: "stderr" }
* Deno.openSync('../test.file');
* console.log(Deno.resources());
* // { 0: "stdin", 1: "stdout", 2: "stderr", 3: "fsFile" }
* ```
*
* @category Observability
*/
export function resources(): ResourceMap;
/**
* Additional information for FsEvent objects with the "other" kind.
*
* - `"rescan"`: rescan notices indicate either a lapse in the events or a
* change in the filesystem such that events received so far can no longer
* be relied on to represent the state of the filesystem now. An
* application that simply reacts to file changes may not care about this.
* An application that keeps an in-memory representation of the filesystem
* will need to care, and will need to refresh that representation directly
* from the filesystem.
*
* @category File System
*/
export type FsEventFlag = "rescan";
/**
* Represents a unique file system event yielded by a
* {@linkcode Deno.FsWatcher}.
*
* @category File System */
export interface FsEvent {
/** The kind/type of the file system event. */
kind: "any" | "access" | "create" | "modify" | "remove" | "other";
/** An array of paths that are associated with the file system event. */
paths: string[];
/** Any additional flags associated with the event. */
flag?: FsEventFlag;
}
/**
* Returned by {@linkcode Deno.watchFs}. It is an async iterator yielding up
* system events. To stop watching the file system by calling `.close()`
* method.
*
* @category File System
*/
export interface FsWatcher extends AsyncIterable<FsEvent>, Disposable {
/** The resource id. */
readonly rid: number;
/** Stops watching the file system and closes the watcher resource. */
close(): void;
/**
* Stops watching the file system and closes the watcher resource.
*
* @deprecated Will be removed in the future.
*/
return?(value?: any): Promise<IteratorResult<FsEvent>>;
[Symbol.asyncIterator](): AsyncIterableIterator<FsEvent>;
}
/** Watch for file system events against one or more `paths`, which can be
* files or directories. These paths must exist already. One user action (e.g.
* `touch test.file`) can generate multiple file system events. Likewise,
* one user action can result in multiple file paths in one event (e.g. `mv
* old_name.txt new_name.txt`).
*
* The recursive option is `true` by default and, for directories, will watch
* the specified directory and all sub directories.
*
* Note that the exact ordering of the events can vary between operating
* systems.
*
* ```ts
* const watcher = Deno.watchFs("/");
* for await (const event of watcher) {
* console.log(">>>> event", event);
* // { kind: "create", paths: [ "/foo.txt" ] }
* }
* ```
*
* Call `watcher.close()` to stop watching.
*
* ```ts
* const watcher = Deno.watchFs("/");
*
* setTimeout(() => {
* watcher.close();
* }, 5000);
*
* for await (const event of watcher) {
* console.log(">>>> event", event);
* }
* ```
*
* Requires `allow-read` permission.
*
* @tags allow-read
* @category File System
*/
export function watchFs(
paths: string | string[],
options?: { recursive: boolean },
): FsWatcher;
/**
* @deprecated Use {@linkcode Deno.Command} instead.
*
* Options which can be used with {@linkcode Deno.run}.
*
* @category Sub Process */
export interface RunOptions {
/** Arguments to pass.
*
* _Note_: the first element needs to be a path to the executable that is
* being run. */
cmd: readonly string[] | [string | URL, ...string[]];
/** The current working directory that should be used when running the
* sub-process. */
cwd?: string;
/** Any environment variables to be set when running the sub-process. */
env?: Record<string, string>;
/** By default subprocess inherits `stdout` of parent process. To change
* this this option can be set to a resource ID (_rid_) of an open file,
* `"inherit"`, `"piped"`, or `"null"`:
*
* - _number_: the resource ID of an open file/resource. This allows you to
* write to a file.
* - `"inherit"`: The default if unspecified. The subprocess inherits from the
* parent.
* - `"piped"`: A new pipe should be arranged to connect the parent and child
* sub-process.
* - `"null"`: This stream will be ignored. This is the equivalent of attaching
* the stream to `/dev/null`.
*/
stdout?: "inherit" | "piped" | "null" | number;
/** By default subprocess inherits `stderr` of parent process. To change
* this this option can be set to a resource ID (_rid_) of an open file,
* `"inherit"`, `"piped"`, or `"null"`:
*
* - _number_: the resource ID of an open file/resource. This allows you to
* write to a file.
* - `"inherit"`: The default if unspecified. The subprocess inherits from the
* parent.
* - `"piped"`: A new pipe should be arranged to connect the parent and child
* sub-process.
* - `"null"`: This stream will be ignored. This is the equivalent of attaching
* the stream to `/dev/null`.
*/
stderr?: "inherit" | "piped" | "null" | number;
/** By default subprocess inherits `stdin` of parent process. To change
* this this option can be set to a resource ID (_rid_) of an open file,
* `"inherit"`, `"piped"`, or `"null"`:
*
* - _number_: the resource ID of an open file/resource. This allows you to
* read from a file.
* - `"inherit"`: The default if unspecified. The subprocess inherits from the
* parent.
* - `"piped"`: A new pipe should be arranged to connect the parent and child
* sub-process.
* - `"null"`: This stream will be ignored. This is the equivalent of attaching
* the stream to `/dev/null`.
*/
stdin?: "inherit" | "piped" | "null" | number;
}
/**
* @deprecated Use {@linkcode Deno.Command} instead.
*
* The status resolved from the `.status()` method of a
* {@linkcode Deno.Process} instance.
*
* If `success` is `true`, then `code` will be `0`, but if `success` is
* `false`, the sub-process exit code will be set in `code`.
*
* @category Sub Process */
export type ProcessStatus =
| {
success: true;
code: 0;
signal?: undefined;
}
| {
success: false;
code: number;
signal?: number;
};
/**
* * @deprecated Use {@linkcode Deno.Command} instead.
*
* Represents an instance of a sub process that is returned from
* {@linkcode Deno.run} which can be used to manage the sub-process.
*
* @category Sub Process */
export class Process<T extends RunOptions = RunOptions> {
/** The resource ID of the sub-process. */
readonly rid: number;
/** The operating system's process ID for the sub-process. */
readonly pid: number;
/** A reference to the sub-processes `stdin`, which allows interacting with
* the sub-process at a low level. */
readonly stdin: T["stdin"] extends "piped" ? Writer & Closer & {
writable: WritableStream<Uint8Array>;
}
: (Writer & Closer & { writable: WritableStream<Uint8Array> }) | null;
/** A reference to the sub-processes `stdout`, which allows interacting with
* the sub-process at a low level. */
readonly stdout: T["stdout"] extends "piped" ? Reader & Closer & {
readable: ReadableStream<Uint8Array>;
}
: (Reader & Closer & { readable: ReadableStream<Uint8Array> }) | null;
/** A reference to the sub-processes `stderr`, which allows interacting with
* the sub-process at a low level. */
readonly stderr: T["stderr"] extends "piped" ? Reader & Closer & {
readable: ReadableStream<Uint8Array>;
}
: (Reader & Closer & { readable: ReadableStream<Uint8Array> }) | null;
/** Wait for the process to exit and return its exit status.
*
* Calling this function multiple times will return the same status.
*
* The `stdin` reference to the process will be closed before waiting to
* avoid a deadlock.
*
* If `stdout` and/or `stderr` were set to `"piped"`, they must be closed
* manually before the process can exit.
*
* To run process to completion and collect output from both `stdout` and
* `stderr` use:
*
* ```ts
* const p = Deno.run({ cmd: [ "echo", "hello world" ], stderr: 'piped', stdout: 'piped' });
* const [status, stdout, stderr] = await Promise.all([
* p.status(),
* p.output(),
* p.stderrOutput()
* ]);
* p.close();
* ```
*/
status(): Promise<ProcessStatus>;
/** Buffer the stdout until EOF and return it as `Uint8Array`.
*
* You must set `stdout` to `"piped"` when creating the process.
*
* This calls `close()` on stdout after its done. */
output(): Promise<Uint8Array>;
/** Buffer the stderr until EOF and return it as `Uint8Array`.
*
* You must set `stderr` to `"piped"` when creating the process.
*
* This calls `close()` on stderr after its done. */
stderrOutput(): Promise<Uint8Array>;
/** Clean up resources associated with the sub-process instance. */
close(): void;
/** Send a signal to process.
* Default signal is `"SIGTERM"`.
*
* ```ts
* const p = Deno.run({ cmd: [ "sleep", "20" ]});
* p.kill("SIGTERM");
* p.close();
* ```
*/
kill(signo?: Signal): void;
}
/** Operating signals which can be listened for or sent to sub-processes. What
* signals and what their standard behaviors are OS dependent.
*
* @category Runtime Environment */
export type Signal =
| "SIGABRT"
| "SIGALRM"
| "SIGBREAK"
| "SIGBUS"
| "SIGCHLD"
| "SIGCONT"
| "SIGEMT"
| "SIGFPE"
| "SIGHUP"
| "SIGILL"
| "SIGINFO"
| "SIGINT"
| "SIGIO"
| "SIGKILL"
| "SIGPIPE"
| "SIGPROF"
| "SIGPWR"
| "SIGQUIT"
| "SIGSEGV"
| "SIGSTKFLT"
| "SIGSTOP"
| "SIGSYS"
| "SIGTERM"
| "SIGTRAP"
| "SIGTSTP"
| "SIGTTIN"
| "SIGTTOU"
| "SIGURG"
| "SIGUSR1"
| "SIGUSR2"
| "SIGVTALRM"
| "SIGWINCH"
| "SIGXCPU"
| "SIGXFSZ";
/** Registers the given function as a listener of the given signal event.
*
* ```ts
* Deno.addSignalListener(
* "SIGTERM",
* () => {
* console.log("SIGTERM!")
* }
* );
* ```
*
* _Note_: On Windows only `"SIGINT"` (CTRL+C) and `"SIGBREAK"` (CTRL+Break)
* are supported.
*
* @category Runtime Environment
*/
export function addSignalListener(signal: Signal, handler: () => void): void;
/** Removes the given signal listener that has been registered with
* {@linkcode Deno.addSignalListener}.
*
* ```ts
* const listener = () => {
* console.log("SIGTERM!")
* };
* Deno.addSignalListener("SIGTERM", listener);
* Deno.removeSignalListener("SIGTERM", listener);
* ```
*
* _Note_: On Windows only `"SIGINT"` (CTRL+C) and `"SIGBREAK"` (CTRL+Break)
* are supported.
*
* @category Runtime Environment
*/
export function removeSignalListener(
signal: Signal,
handler: () => void,
): void;
/**
* @deprecated Use {@linkcode Deno.Command} instead.
*
* Spawns new subprocess. RunOptions must contain at a minimum the `opt.cmd`,
* an array of program arguments, the first of which is the binary.
*
* ```ts
* const p = Deno.run({
* cmd: ["curl", "https://example.com"],
* });
* const status = await p.status();
* ```
*
* Subprocess uses same working directory as parent process unless `opt.cwd`
* is specified.
*
* Environmental variables from parent process can be cleared using `opt.clearEnv`.
* Doesn't guarantee that only `opt.env` variables are present,
* as the OS may set environmental variables for processes.
*
* Environmental variables for subprocess can be specified using `opt.env`
* mapping.
*
* `opt.uid` sets the child process’s user ID. This translates to a setuid call
* in the child process. Failure in the setuid call will cause the spawn to fail.
*
* `opt.gid` is similar to `opt.uid`, but sets the group ID of the child process.
* This has the same semantics as the uid field.
*
* By default subprocess inherits stdio of parent process. To change
* this this, `opt.stdin`, `opt.stdout`, and `opt.stderr` can be set
* independently to a resource ID (_rid_) of an open file, `"inherit"`,
* `"piped"`, or `"null"`:
*
* - _number_: the resource ID of an open file/resource. This allows you to
* read or write to a file.
* - `"inherit"`: The default if unspecified. The subprocess inherits from the
* parent.
* - `"piped"`: A new pipe should be arranged to connect the parent and child
* sub-process.
* - `"null"`: This stream will be ignored. This is the equivalent of attaching
* the stream to `/dev/null`.
*
* Details of the spawned process are returned as an instance of
* {@linkcode Deno.Process}.
*
* Requires `allow-run` permission.
*
* @tags allow-run
* @category Sub Process
*/
export function run<T extends RunOptions = RunOptions>(opt: T): Process<T>;
/** Create a child process.
*
* If any stdio options are not set to `"piped"`, accessing the corresponding
* field on the `Command` or its `CommandOutput` will throw a `TypeError`.
*
* If `stdin` is set to `"piped"`, the `stdin` {@linkcode WritableStream}
* needs to be closed manually.
*
* @example Spawn a subprocess and pipe the output to a file
*
* ```ts
* const command = new Deno.Command(Deno.execPath(), {
* args: [
* "eval",
* "console.log('Hello World')",
* ],
* stdin: "piped",
* stdout: "piped",
* });
* const child = command.spawn();
*
* // open a file and pipe the subprocess output to it.
* child.stdout.pipeTo(
* Deno.openSync("output", { write: true, create: true }).writable,
* );
*
* // manually close stdin
* child.stdin.close();
* const status = await child.status;
* ```
*
* @example Spawn a subprocess and collect its output
*
* ```ts
* const command = new Deno.Command(Deno.execPath(), {
* args: [
* "eval",
* "console.log('hello'); console.error('world')",
* ],
* });
* const { code, stdout, stderr } = await command.output();
* console.assert(code === 0);
* console.assert("hello\n" === new TextDecoder().decode(stdout));
* console.assert("world\n" === new TextDecoder().decode(stderr));
* ```
*
* @example Spawn a subprocess and collect its output synchronously
*
* ```ts
* const command = new Deno.Command(Deno.execPath(), {
* args: [
* "eval",
* "console.log('hello'); console.error('world')",
* ],
* });
* const { code, stdout, stderr } = command.outputSync();
* console.assert(code === 0);
* console.assert("hello\n" === new TextDecoder().decode(stdout));
* console.assert("world\n" === new TextDecoder().decode(stderr));
* ```
*
* @tags allow-run
* @category Sub Process
*/
export class Command {
constructor(command: string | URL, options?: CommandOptions);
/**
* Executes the {@linkcode Deno.Command}, waiting for it to finish and
* collecting all of its output.
* If `spawn()` was called, calling this function will collect the remaining
* output.
*
* Will throw an error if `stdin: "piped"` is set.
*
* If options `stdout` or `stderr` are not set to `"piped"`, accessing the
* corresponding field on {@linkcode Deno.CommandOutput} will throw a `TypeError`.
*/
output(): Promise<CommandOutput>;
/**
* Synchronously executes the {@linkcode Deno.Command}, waiting for it to
* finish and collecting all of its output.
*
* Will throw an error if `stdin: "piped"` is set.
*
* If options `stdout` or `stderr` are not set to `"piped"`, accessing the
* corresponding field on {@linkcode Deno.CommandOutput} will throw a `TypeError`.
*/
outputSync(): CommandOutput;
/**
* Spawns a streamable subprocess, allowing to use the other methods.
*/
spawn(): ChildProcess;
}
/**
* The interface for handling a child process returned from
* {@linkcode Deno.Command.spawn}.
*
* @category Sub Process
*/
export class ChildProcess implements Disposable {
get stdin(): WritableStream<Uint8Array>;
get stdout(): ReadableStream<Uint8Array>;
get stderr(): ReadableStream<Uint8Array>;
readonly pid: number;
/** Get the status of the child. */
readonly status: Promise<CommandStatus>;
/** Waits for the child to exit completely, returning all its output and
* status. */
output(): Promise<CommandOutput>;
/** Kills the process with given {@linkcode Deno.Signal}.
*
* @param [signo="SIGTERM"]
*/
kill(signo?: Signal): void;
/** Ensure that the status of the child process prevents the Deno process
* from exiting. */
ref(): void;
/** Ensure that the status of the child process does not block the Deno
* process from exiting. */
unref(): void;
[Symbol.dispose](): void;
}
/**
* Options which can be set when calling {@linkcode Deno.Command}.
*
* @category Sub Process
*/
export interface CommandOptions {
/** Arguments to pass to the process. */
args?: string[];
/**
* The working directory of the process.
*
* If not specified, the `cwd` of the parent process is used.
*/
cwd?: string | URL;
/**
* Clear environmental variables from parent process.
*
* Doesn't guarantee that only `env` variables are present, as the OS may
* set environmental variables for processes.
*
* @default {false}
*/
clearEnv?: boolean;
/** Environmental variables to pass to the subprocess. */
env?: Record<string, string>;
/**
* Sets the child process’s user ID. This translates to a setuid call in the
* child process. Failure in the set uid call will cause the spawn to fail.
*/
uid?: number;
/** Similar to `uid`, but sets the group ID of the child process. */
gid?: number;
/**
* An {@linkcode AbortSignal} that allows closing the process using the
* corresponding {@linkcode AbortController} by sending the process a
* SIGTERM signal.
*
* Not supported in {@linkcode Deno.Command.outputSync}.
*/
signal?: AbortSignal;
/** How `stdin` of the spawned process should be handled.
*
* Defaults to `"inherit"` for `output` & `outputSync`,
* and `"inherit"` for `spawn`. */
stdin?: "piped" | "inherit" | "null";
/** How `stdout` of the spawned process should be handled.
*
* Defaults to `"piped"` for `output` & `outputSync`,
* and `"inherit"` for `spawn`. */
stdout?: "piped" | "inherit" | "null";
/** How `stderr` of the spawned process should be handled.
*
* Defaults to `"piped"` for `output` & `outputSync`,
* and `"inherit"` for `spawn`. */
stderr?: "piped" | "inherit" | "null";
/** Skips quoting and escaping of the arguments on windows. This option
* is ignored on non-windows platforms.
*
* @default {false} */
windowsRawArguments?: boolean;
}
/**
* @category Sub Process
*/
export interface CommandStatus {
/** If the child process exits with a 0 status code, `success` will be set
* to `true`, otherwise `false`. */
success: boolean;
/** The exit code of the child process. */
code: number;
/** The signal associated with the child process. */
signal: Signal | null;
}
/**
* The interface returned from calling {@linkcode Deno.Command.output} or
* {@linkcode Deno.Command.outputSync} which represents the result of spawning the
* child process.
*
* @category Sub Process
*/
export interface CommandOutput extends CommandStatus {
/** The buffered output from the child process' `stdout`. */
readonly stdout: Uint8Array;
/** The buffered output from the child process' `stderr`. */
readonly stderr: Uint8Array;
}
/** Option which can be specified when performing {@linkcode Deno.inspect}.
*
* @category Console and Debugging */
export interface InspectOptions {
/** Stylize output with ANSI colors.
*
* @default {false} */
colors?: boolean;
/** Try to fit more than one entry of a collection on the same line.
*
* @default {true} */
compact?: boolean;
/** Traversal depth for nested objects.
*
* @default {4} */
depth?: number;
/** The maximum length for an inspection to take up a single line.
*
* @default {80} */
breakLength?: number;
/** Whether or not to escape sequences.
*
* @default {true} */
escapeSequences?: boolean;
/** The maximum number of iterable entries to print.
*
* @default {100} */
iterableLimit?: number;
/** Show a Proxy's target and handler.
*
* @default {false} */
showProxy?: boolean;
/** Sort Object, Set and Map entries by key.
*
* @default {false} */
sorted?: boolean;
/** Add a trailing comma for multiline collections.
*
* @default {false} */
trailingComma?: boolean;
/** Evaluate the result of calling getters.
*
* @default {false} */
getters?: boolean;
/** Show an object's non-enumerable properties.
*
* @default {false} */
showHidden?: boolean;
/** The maximum length of a string before it is truncated with an
* ellipsis. */
strAbbreviateSize?: number;
}
/** Converts the input into a string that has the same format as printed by
* `console.log()`.
*
* ```ts
* const obj = {
* a: 10,
* b: "hello",
* };
* const objAsString = Deno.inspect(obj); // { a: 10, b: "hello" }
* console.log(obj); // prints same value as objAsString, e.g. { a: 10, b: "hello" }
* ```
*
* A custom inspect functions can be registered on objects, via the symbol
* `Symbol.for("Deno.customInspect")`, to control and customize the output
* of `inspect()` or when using `console` logging:
*
* ```ts
* class A {
* x = 10;
* y = "hello";
* [Symbol.for("Deno.customInspect")]() {
* return `x=${this.x}, y=${this.y}`;
* }
* }
*
* const inStringFormat = Deno.inspect(new A()); // "x=10, y=hello"
* console.log(inStringFormat); // prints "x=10, y=hello"
* ```
*
* A depth can be specified by using the `depth` option:
*
* ```ts
* Deno.inspect({a: {b: {c: {d: 'hello'}}}}, {depth: 2}); // { a: { b: [Object] } }
* ```
*
* @category Console and Debugging
*/
export function inspect(value: unknown, options?: InspectOptions): string;
/** The name of a privileged feature which needs permission.
*
* @category Permissions
*/
export type PermissionName =
| "run"
| "read"
| "write"
| "net"
| "env"
| "sys"
| "ffi"
| "hrtime";
/** The current status of the permission:
*
* - `"granted"` - the permission has been granted.
* - `"denied"` - the permission has been explicitly denied.
* - `"prompt"` - the permission has not explicitly granted nor denied.
*
* @category Permissions
*/
export type PermissionState =
| "granted"
| "denied"
| "prompt";
/** The permission descriptor for the `allow-run` and `deny-run` permissions, which controls
* access to what sub-processes can be executed by Deno. The option `command`
* allows scoping the permission to a specific executable.
*
* **Warning, in practice, `allow-run` is effectively the same as `allow-all`
* in the sense that malicious code could execute any arbitrary code on the
* host.**
*
* @category Permissions */
export interface RunPermissionDescriptor {
name: "run";
/** An `allow-run` or `deny-run` permission can be scoped to a specific executable,
* which would be relative to the start-up CWD of the Deno CLI. */
command?: string | URL;
}
/** The permission descriptor for the `allow-read` and `deny-read` permissions, which controls
* access to reading resources from the local host. The option `path` allows
* scoping the permission to a specific path (and if the path is a directory
* any sub paths).
*
* Permission granted under `allow-read` only allows runtime code to attempt
* to read, the underlying operating system may apply additional permissions.
*
* @category Permissions */
export interface ReadPermissionDescriptor {
name: "read";
/** An `allow-read` or `deny-read` permission can be scoped to a specific path (and if
* the path is a directory, any sub paths). */
path?: string | URL;
}
/** The permission descriptor for the `allow-write` and `deny-write` permissions, which
* controls access to writing to resources from the local host. The option
* `path` allow scoping the permission to a specific path (and if the path is
* a directory any sub paths).
*
* Permission granted under `allow-write` only allows runtime code to attempt
* to write, the underlying operating system may apply additional permissions.
*
* @category Permissions */
export interface WritePermissionDescriptor {
name: "write";
/** An `allow-write` or `deny-write` permission can be scoped to a specific path (and if
* the path is a directory, any sub paths). */
path?: string | URL;
}
/** The permission descriptor for the `allow-net` and `deny-net` permissions, which controls
* access to opening network ports and connecting to remote hosts via the
* network. The option `host` allows scoping the permission for outbound
* connection to a specific host and port.
*
* @category Permissions */
export interface NetPermissionDescriptor {
name: "net";
/** Optional host string of the form `"<hostname>[:<port>]"`. Examples:
*
* "github.com"
* "deno.land:8080"
*/
host?: string;
}
/** The permission descriptor for the `allow-env` and `deny-env` permissions, which controls
* access to being able to read and write to the process environment variables
* as well as access other information about the environment. The option
* `variable` allows scoping the permission to a specific environment
* variable.
*
* @category Permissions */
export interface EnvPermissionDescriptor {
name: "env";
/** Optional environment variable name (e.g. `PATH`). */
variable?: string;
}
/** The permission descriptor for the `allow-sys` and `deny-sys` permissions, which controls
* access to sensitive host system information, which malicious code might
* attempt to exploit. The option `kind` allows scoping the permission to a
* specific piece of information.
*
* @category Permissions */
export interface SysPermissionDescriptor {
name: "sys";
/** The specific information to scope the permission to. */
kind?:
| "loadavg"
| "hostname"
| "systemMemoryInfo"
| "networkInterfaces"
| "osRelease"
| "osUptime"
| "uid"
| "gid";
}
/** The permission descriptor for the `allow-ffi` and `deny-ffi` permissions, which controls
* access to loading _foreign_ code and interfacing with it via the
* [Foreign Function Interface API](https://deno.land/manual/runtime/ffi_api)
* available in Deno. The option `path` allows scoping the permission to a
* specific path on the host.
*
* @category Permissions */
export interface FfiPermissionDescriptor {
name: "ffi";
/** Optional path on the local host to scope the permission to. */
path?: string | URL;
}
/** The permission descriptor for the `allow-hrtime` and `deny-hrtime` permissions, which
* controls if the runtime code has access to high resolution time. High
* resolution time is considered sensitive information, because it can be used
* by malicious code to gain information about the host that it might not
* otherwise have access to.
*
* @category Permissions */
export interface HrtimePermissionDescriptor {
name: "hrtime";
}
/** Permission descriptors which define a permission and can be queried,
* requested, or revoked.
*
* View the specifics of the individual descriptors for more information about
* each permission kind.
*
* @category Permissions
*/
export type PermissionDescriptor =
| RunPermissionDescriptor
| ReadPermissionDescriptor
| WritePermissionDescriptor
| NetPermissionDescriptor
| EnvPermissionDescriptor
| SysPermissionDescriptor
| FfiPermissionDescriptor
| HrtimePermissionDescriptor;
/** The interface which defines what event types are supported by
* {@linkcode PermissionStatus} instances.
*
* @category Permissions */
export interface PermissionStatusEventMap {
"change": Event;
}
/** An {@linkcode EventTarget} returned from the {@linkcode Deno.permissions}
* API which can provide updates to any state changes of the permission.
*
* @category Permissions */
export class PermissionStatus extends EventTarget {
// deno-lint-ignore no-explicit-any
onchange: ((this: PermissionStatus, ev: Event) => any) | null;
readonly state: PermissionState;
/**
* Describes if permission is only granted partially, eg. an access
* might be granted to "/foo" directory, but denied for "/foo/bar".
* In such case this field will be set to `true` when querying for
* read permissions of "/foo" directory.
*/
readonly partial: boolean;
addEventListener<K extends keyof PermissionStatusEventMap>(
type: K,
listener: (
this: PermissionStatus,
ev: PermissionStatusEventMap[K],
) => any,
options?: boolean | AddEventListenerOptions,
): void;
addEventListener(
type: string,
listener: EventListenerOrEventListenerObject,
options?: boolean | AddEventListenerOptions,
): void;
removeEventListener<K extends keyof PermissionStatusEventMap>(
type: K,
listener: (
this: PermissionStatus,
ev: PermissionStatusEventMap[K],
) => any,
options?: boolean | EventListenerOptions,
): void;
removeEventListener(
type: string,
listener: EventListenerOrEventListenerObject,
options?: boolean | EventListenerOptions,
): void;
}
/**
* Deno's permission management API.
*
* The class which provides the interface for the {@linkcode Deno.permissions}
* global instance and is based on the web platform
* [Permissions API](https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API),
* though some proposed parts of the API which are useful in a server side
* runtime context were removed or abandoned in the web platform specification
* which is why it was chosen to locate it in the {@linkcode Deno} namespace
* instead.
*
* By default, if the `stdin`/`stdout` is TTY for the Deno CLI (meaning it can
* send and receive text), then the CLI will prompt the user to grant
* permission when an un-granted permission is requested. This behavior can
* be changed by using the `--no-prompt` command at startup. When prompting
* the CLI will request the narrowest permission possible, potentially making
* it annoying to the user. The permissions APIs allow the code author to
* request a wider set of permissions at one time in order to provide a better
* user experience.
*
* @category Permissions */
export class Permissions {
/** Resolves to the current status of a permission.
*
* Note, if the permission is already granted, `request()` will not prompt
* the user again, therefore `query()` is only necessary if you are going
* to react differently existing permissions without wanting to modify them
* or prompt the user to modify them.
*
* ```ts
* const status = await Deno.permissions.query({ name: "read", path: "/etc" });
* console.log(status.state);
* ```
*/
query(desc: PermissionDescriptor): Promise<PermissionStatus>;
/** Returns the current status of a permission.
*
* Note, if the permission is already granted, `request()` will not prompt
* the user again, therefore `querySync()` is only necessary if you are going
* to react differently existing permissions without wanting to modify them
* or prompt the user to modify them.
*
* ```ts
* const status = Deno.permissions.querySync({ name: "read", path: "/etc" });
* console.log(status.state);
* ```
*/
querySync(desc: PermissionDescriptor): PermissionStatus;
/** Revokes a permission, and resolves to the state of the permission.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const status = await Deno.permissions.revoke({ name: "run" });
* assert(status.state !== "granted")
* ```
*/
revoke(desc: PermissionDescriptor): Promise<PermissionStatus>;
/** Revokes a permission, and returns the state of the permission.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const status = Deno.permissions.revokeSync({ name: "run" });
* assert(status.state !== "granted")
* ```
*/
revokeSync(desc: PermissionDescriptor): PermissionStatus;
/** Requests the permission, and resolves to the state of the permission.
*
* If the permission is already granted, the user will not be prompted to
* grant the permission again.
*
* ```ts
* const status = await Deno.permissions.request({ name: "env" });
* if (status.state === "granted") {
* console.log("'env' permission is granted.");
* } else {
* console.log("'env' permission is denied.");
* }
* ```
*/
request(desc: PermissionDescriptor): Promise<PermissionStatus>;
/** Requests the permission, and returns the state of the permission.
*
* If the permission is already granted, the user will not be prompted to
* grant the permission again.
*
* ```ts
* const status = Deno.permissions.requestSync({ name: "env" });
* if (status.state === "granted") {
* console.log("'env' permission is granted.");
* } else {
* console.log("'env' permission is denied.");
* }
* ```
*/
requestSync(desc: PermissionDescriptor): PermissionStatus;
}
/** Deno's permission management API.
*
* It is a singleton instance of the {@linkcode Permissions} object and is
* based on the web platform
* [Permissions API](https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API),
* though some proposed parts of the API which are useful in a server side
* runtime context were removed or abandoned in the web platform specification
* which is why it was chosen to locate it in the {@linkcode Deno} namespace
* instead.
*
* By default, if the `stdin`/`stdout` is TTY for the Deno CLI (meaning it can
* send and receive text), then the CLI will prompt the user to grant
* permission when an un-granted permission is requested. This behavior can
* be changed by using the `--no-prompt` command at startup. When prompting
* the CLI will request the narrowest permission possible, potentially making
* it annoying to the user. The permissions APIs allow the code author to
* request a wider set of permissions at one time in order to provide a better
* user experience.
*
* Requesting already granted permissions will not prompt the user and will
* return that the permission was granted.
*
* ### Querying
*
* ```ts
* const status = await Deno.permissions.query({ name: "read", path: "/etc" });
* console.log(status.state);
* ```
*
* ```ts
* const status = Deno.permissions.querySync({ name: "read", path: "/etc" });
* console.log(status.state);
* ```
*
* ### Revoking
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const status = await Deno.permissions.revoke({ name: "run" });
* assert(status.state !== "granted")
* ```
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const status = Deno.permissions.revokeSync({ name: "run" });
* assert(status.state !== "granted")
* ```
*
* ### Requesting
*
* ```ts
* const status = await Deno.permissions.request({ name: "env" });
* if (status.state === "granted") {
* console.log("'env' permission is granted.");
* } else {
* console.log("'env' permission is denied.");
* }
* ```
*
* ```ts
* const status = Deno.permissions.requestSync({ name: "env" });
* if (status.state === "granted") {
* console.log("'env' permission is granted.");
* } else {
* console.log("'env' permission is denied.");
* }
* ```
*
* @category Permissions
*/
export const permissions: Permissions;
/** Information related to the build of the current Deno runtime.
*
* Users are discouraged from code branching based on this information, as
* assumptions about what is available in what build environment might change
* over time. Developers should specifically sniff out the features they
* intend to use.
*
* The intended use for the information is for logging and debugging purposes.
*
* @category Runtime Environment
*/
export const build: {
/** The [LLVM](https://llvm.org/) target triple, which is the combination
* of `${arch}-${vendor}-${os}` and represent the specific build target that
* the current runtime was built for. */
target: string;
/** Instruction set architecture that the Deno CLI was built for. */
arch: "x86_64" | "aarch64";
/** The operating system that the Deno CLI was built for. `"darwin"` is
* also known as OSX or MacOS. */
os:
| "darwin"
| "linux"
| "windows"
| "freebsd"
| "netbsd"
| "aix"
| "solaris"
| "illumos";
/** The computer vendor that the Deno CLI was built for. */
vendor: string;
/** Optional environment flags that were set for this build of Deno CLI. */
env?: string;
};
/** Version information related to the current Deno CLI runtime environment.
*
* Users are discouraged from code branching based on this information, as
* assumptions about what is available in what build environment might change
* over time. Developers should specifically sniff out the features they
* intend to use.
*
* The intended use for the information is for logging and debugging purposes.
*
* @category Runtime Environment
*/
export const version: {
/** Deno CLI's version. For example: `"1.26.0"`. */
deno: string;
/** The V8 version used by Deno. For example: `"10.7.100.0"`.
*
* V8 is the underlying JavaScript runtime platform that Deno is built on
* top of. */
v8: string;
/** The TypeScript version used by Deno. For example: `"4.8.3"`.
*
* A version of the TypeScript type checker and language server is built-in
* to the Deno CLI. */
typescript: string;
};
/** Returns the script arguments to the program.
*
* Give the following command line invocation of Deno:
*
* ```sh
* deno run --allow-read https://deno.land/std/examples/cat.ts /etc/passwd
* ```
*
* Then `Deno.args` will contain:
*
* ```ts
* [ "/etc/passwd" ]
* ```
*
* If you are looking for a structured way to parse arguments, there is the
* [`std/flags`](https://deno.land/std/flags) module as part of the Deno
* standard library.
*
* @category Runtime Environment
*/
export const args: string[];
/**
* A symbol which can be used as a key for a custom method which will be
* called when `Deno.inspect()` is called, or when the object is logged to
* the console.
*
* @deprecated This symbol is deprecated since 1.9. Use
* `Symbol.for("Deno.customInspect")` instead.
*
* @category Console and Debugging
*/
export const customInspect: unique symbol;
/** The URL of the entrypoint module entered from the command-line. It
* requires read permission to the CWD.
*
* Also see {@linkcode ImportMeta} for other related information.
*
* @tags allow-read
* @category Runtime Environment
*/
export const mainModule: string;
/** Options that can be used with {@linkcode symlink} and
* {@linkcode symlinkSync}.
*
* @category File System */
export interface SymlinkOptions {
/** If the symbolic link should be either a file or directory. This option
* only applies to Windows and is ignored on other operating systems. */
type: "file" | "dir";
}
/**
* Creates `newpath` as a symbolic link to `oldpath`.
*
* The `options.type` parameter can be set to `"file"` or `"dir"`. This
* argument is only available on Windows and ignored on other platforms.
*
* ```ts
* await Deno.symlink("old/name", "new/name");
* ```
*
* Requires full `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function symlink(
oldpath: string | URL,
newpath: string | URL,
options?: SymlinkOptions,
): Promise<void>;
/**
* Creates `newpath` as a symbolic link to `oldpath`.
*
* The `options.type` parameter can be set to `"file"` or `"dir"`. This
* argument is only available on Windows and ignored on other platforms.
*
* ```ts
* Deno.symlinkSync("old/name", "new/name");
* ```
*
* Requires full `allow-read` and `allow-write` permissions.
*
* @tags allow-read, allow-write
* @category File System
*/
export function symlinkSync(
oldpath: string | URL,
newpath: string | URL,
options?: SymlinkOptions,
): void;
/**
* Truncates or extends the specified file stream, to reach the specified
* `len`.
*
* If `len` is not specified then the entire file contents are truncated as if
* `len` was set to `0`.
*
* If the file previously was larger than this new length, the extra data is
* lost.
*
* If the file previously was shorter, it is extended, and the extended part
* reads as null bytes ('\0').
*
* ### Truncate the entire file
*
* ```ts
* const file = await Deno.open(
* "my_file.txt",
* { read: true, write: true, create: true }
* );
* await Deno.ftruncate(file.rid);
* ```
*
* ### Truncate part of the file
*
* ```ts
* const file = await Deno.open(
* "my_file.txt",
* { read: true, write: true, create: true }
* );
* await Deno.write(file.rid, new TextEncoder().encode("Hello World"));
* await Deno.ftruncate(file.rid, 7);
* const data = new Uint8Array(32);
* await Deno.read(file.rid, data);
* console.log(new TextDecoder().decode(data)); // Hello W
* ```
*
* @category File System
*/
export function ftruncate(rid: number, len?: number): Promise<void>;
/**
* Synchronously truncates or extends the specified file stream, to reach the
* specified `len`.
*
* If `len` is not specified then the entire file contents are truncated as if
* `len` was set to `0`.
*
* If the file previously was larger than this new length, the extra data is
* lost.
*
* If the file previously was shorter, it is extended, and the extended part
* reads as null bytes ('\0').
*
* ### Truncate the entire file
*
* ```ts
* const file = Deno.openSync(
* "my_file.txt",
* { read: true, write: true, truncate: true, create: true }
* );
* Deno.ftruncateSync(file.rid);
* ```
*
* ### Truncate part of the file
*
* ```ts
* const file = Deno.openSync(
* "my_file.txt",
* { read: true, write: true, create: true }
* );
* Deno.writeSync(file.rid, new TextEncoder().encode("Hello World"));
* Deno.ftruncateSync(file.rid, 7);
* Deno.seekSync(file.rid, 0, Deno.SeekMode.Start);
* const data = new Uint8Array(32);
* Deno.readSync(file.rid, data);
* console.log(new TextDecoder().decode(data)); // Hello W
* ```
*
* @category File System
*/
export function ftruncateSync(rid: number, len?: number): void;
/**
* Synchronously changes the access (`atime`) and modification (`mtime`) times
* of a file stream resource referenced by `rid`. Given times are either in
* seconds (UNIX epoch time) or as `Date` objects.
*
* ```ts
* const file = Deno.openSync("file.txt", { create: true, write: true });
* Deno.futimeSync(file.rid, 1556495550, new Date());
* ```
*
* @category File System
*/
export function futimeSync(
rid: number,
atime: number | Date,
mtime: number | Date,
): void;
/**
* Changes the access (`atime`) and modification (`mtime`) times of a file
* stream resource referenced by `rid`. Given times are either in seconds
* (UNIX epoch time) or as `Date` objects.
*
* ```ts
* const file = await Deno.open("file.txt", { create: true, write: true });
* await Deno.futime(file.rid, 1556495550, new Date());
* ```
*
* @category File System
*/
export function futime(
rid: number,
atime: number | Date,
mtime: number | Date,
): Promise<void>;
/**
* Returns a `Deno.FileInfo` for the given file stream.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const file = await Deno.open("file.txt", { read: true });
* const fileInfo = await Deno.fstat(file.rid);
* assert(fileInfo.isFile);
* ```
*
* @category File System
*/
export function fstat(rid: number): Promise<FileInfo>;
/**
* Synchronously returns a {@linkcode Deno.FileInfo} for the given file
* stream.
*
* ```ts
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* const file = Deno.openSync("file.txt", { read: true });
* const fileInfo = Deno.fstatSync(file.rid);
* assert(fileInfo.isFile);
* ```
*
* @category File System
*/
export function fstatSync(rid: number): FileInfo;
/**
* Synchronously changes the access (`atime`) and modification (`mtime`) times
* of a file system object referenced by `path`. Given times are either in
* seconds (UNIX epoch time) or as `Date` objects.
*
* ```ts
* Deno.utimeSync("myfile.txt", 1556495550, new Date());
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function utimeSync(
path: string | URL,
atime: number | Date,
mtime: number | Date,
): void;
/**
* Changes the access (`atime`) and modification (`mtime`) times of a file
* system object referenced by `path`. Given times are either in seconds
* (UNIX epoch time) or as `Date` objects.
*
* ```ts
* await Deno.utime("myfile.txt", 1556495550, new Date());
* ```
*
* Requires `allow-write` permission.
*
* @tags allow-write
* @category File System
*/
export function utime(
path: string | URL,
atime: number | Date,
mtime: number | Date,
): Promise<void>;
/** The event yielded from an {@linkcode HttpConn} which represents an HTTP
* request from a remote client.
*
* @category HTTP Server */
export interface RequestEvent {
/** The request from the client in the form of the web platform
* {@linkcode Request}. */
readonly request: Request;
/** The method to be used to respond to the event. The response needs to
* either be an instance of {@linkcode Response} or a promise that resolves
* with an instance of `Response`.
*
* When the response is successfully processed then the promise returned
* will be resolved. If there are any issues with sending the response,
* the promise will be rejected. */
respondWith(r: Response | PromiseLike<Response>): Promise<void>;
}
/** The async iterable that is returned from {@linkcode Deno.serveHttp} which
* yields up {@linkcode RequestEvent} events, representing individual
* requests on the HTTP server connection.
*
* @category HTTP Server */
export interface HttpConn extends AsyncIterable<RequestEvent>, Disposable {
/** The resource ID associated with this connection. Generally users do not
* need to be aware of this identifier. */
readonly rid: number;
/** An alternative to the async iterable interface which provides promises
* which resolve with either a {@linkcode RequestEvent} when there is
* another request or `null` when the client has closed the connection. */
nextRequest(): Promise<RequestEvent | null>;
/** Initiate a server side closure of the connection, indicating to the
* client that you refuse to accept any more requests on this connection.
*
* Typically the client closes the connection, which will result in the
* async iterable terminating or the `nextRequest()` method returning
* `null`. */
close(): void;
}
/**
* Provides an interface to handle HTTP request and responses over TCP or TLS
* connections. The method returns an {@linkcode HttpConn} which yields up
* {@linkcode RequestEvent} events, which utilize the web platform standard
* {@linkcode Request} and {@linkcode Response} objects to handle the request.
*
* ```ts
* const conn = Deno.listen({ port: 80 });
* const httpConn = Deno.serveHttp(await conn.accept());
* const e = await httpConn.nextRequest();
* if (e) {
* e.respondWith(new Response("Hello World"));
* }
* ```
*
* Alternatively, you can also use the async iterator approach:
*
* ```ts
* async function handleHttp(conn: Deno.Conn) {
* for await (const e of Deno.serveHttp(conn)) {
* e.respondWith(new Response("Hello World"));
* }
* }
*
* for await (const conn of Deno.listen({ port: 80 })) {
* handleHttp(conn);
* }
* ```
*
* If `httpConn.nextRequest()` encounters an error or returns `null` then the
* underlying {@linkcode HttpConn} resource is closed automatically.
*
* Also see the experimental Flash HTTP server {@linkcode Deno.serve} which
* provides a ground up rewrite of handling of HTTP requests and responses
* within the Deno CLI.
*
* Note that this function *consumes* the given connection passed to it, thus
* the original connection will be unusable after calling this. Additionally,
* you need to ensure that the connection is not being used elsewhere when
* calling this function in order for the connection to be consumed properly.
*
* For instance, if there is a `Promise` that is waiting for read operation on
* the connection to complete, it is considered that the connection is being
* used elsewhere. In such a case, this function will fail.
*
* @category HTTP Server
*/
export function serveHttp(conn: Conn): HttpConn;
/** The object that is returned from a {@linkcode Deno.upgradeWebSocket}
* request.
*
* @category Web Sockets */
export interface WebSocketUpgrade {
/** The response object that represents the HTTP response to the client,
* which should be used to the {@linkcode RequestEvent} `.respondWith()` for
* the upgrade to be successful. */
response: Response;
/** The {@linkcode WebSocket} interface to communicate to the client via a
* web socket. */
socket: WebSocket;
}
/** Options which can be set when performing a
* {@linkcode Deno.upgradeWebSocket} upgrade of a {@linkcode Request}
*
* @category Web Sockets */
export interface UpgradeWebSocketOptions {
/** Sets the `.protocol` property on the client side web socket to the
* value provided here, which should be one of the strings specified in the
* `protocols` parameter when requesting the web socket. This is intended
* for clients and servers to specify sub-protocols to use to communicate to
* each other. */
protocol?: string;
/** If the client does not respond to this frame with a
* `pong` within the timeout specified, the connection is deemed
* unhealthy and is closed. The `close` and `error` event will be emitted.
*
* The default is 120 seconds. Set to `0` to disable timeouts. */
idleTimeout?: number;
}
/**
* Upgrade an incoming HTTP request to a WebSocket.
*
* Given a {@linkcode Request}, returns a pair of {@linkcode WebSocket} and
* {@linkcode Response} instances. The original request must be responded to
* with the returned response for the websocket upgrade to be successful.
*
* ```ts
* const conn = Deno.listen({ port: 80 });
* const httpConn = Deno.serveHttp(await conn.accept());
* const e = await httpConn.nextRequest();
* if (e) {
* const { socket, response } = Deno.upgradeWebSocket(e.request);
* socket.onopen = () => {
* socket.send("Hello World!");
* };
* socket.onmessage = (e) => {
* console.log(e.data);
* socket.close();
* };
* socket.onclose = () => console.log("WebSocket has been closed.");
* socket.onerror = (e) => console.error("WebSocket error:", e);
* e.respondWith(response);
* }
* ```
*
* If the request body is disturbed (read from) before the upgrade is
* completed, upgrading fails.
*
* This operation does not yet consume the request or open the websocket. This
* only happens once the returned response has been passed to `respondWith()`.
*
* @category Web Sockets
*/
export function upgradeWebSocket(
request: Request,
options?: UpgradeWebSocketOptions,
): WebSocketUpgrade;
/** Send a signal to process under given `pid`. The value and meaning of the
* `signal` to the process is operating system and process dependant.
* {@linkcode Signal} provides the most common signals. Default signal
* is `"SIGTERM"`.
*
* The term `kill` is adopted from the UNIX-like command line command `kill`
* which also signals processes.
*
* If `pid` is negative, the signal will be sent to the process group
* identified by `pid`. An error will be thrown if a negative `pid` is used on
* Windows.
*
* ```ts
* const p = Deno.run({
* cmd: ["sleep", "10000"]
* });
*
* Deno.kill(p.pid, "SIGINT");
* ```
*
* Requires `allow-run` permission.
*
* @tags allow-run
* @category Sub Process
*/
export function kill(pid: number, signo?: Signal): void;
/** The type of the resource record to resolve via DNS using
* {@linkcode Deno.resolveDns}.
*
* Only the listed types are supported currently.
*
* @category Network
*/
export type RecordType =
| "A"
| "AAAA"
| "ANAME"
| "CAA"
| "CNAME"
| "MX"
| "NAPTR"
| "NS"
| "PTR"
| "SOA"
| "SRV"
| "TXT";
/**
* Options which can be set when using {@linkcode Deno.resolveDns}.
*
* @category Network */
export interface ResolveDnsOptions {
/** The name server to be used for lookups.
*
* If not specified, defaults to the system configuration. For example
* `/etc/resolv.conf` on Unix-like systems. */
nameServer?: {
/** The IP address of the name server. */
ipAddr: string;
/** The port number the query will be sent to.
*
* @default {53} */
port?: number;
};
/**
* An abort signal to allow cancellation of the DNS resolution operation.
* If the signal becomes aborted the resolveDns operation will be stopped
* and the promise returned will be rejected with an AbortError.
*/
signal?: AbortSignal;
}
/** If {@linkcode Deno.resolveDns} is called with `"CAA"` record type
* specified, it will resolve with an array of objects with this interface.
*
* @category Network
*/
export interface CAARecord {
/** If `true`, indicates that the corresponding property tag **must** be
* understood if the semantics of the CAA record are to be correctly
* interpreted by an issuer.
*
* Issuers **must not** issue certificates for a domain if the relevant CAA
* Resource Record set contains unknown property tags that have `critical`
* set. */
critical: boolean;
/** An string that represents the identifier of the property represented by
* the record. */
tag: string;
/** The value associated with the tag. */
value: string;
}
/** If {@linkcode Deno.resolveDns} is called with `"MX"` record type
* specified, it will return an array of objects with this interface.
*
* @category Network */
export interface MXRecord {
/** A priority value, which is a relative value compared to the other
* preferences of MX records for the domain. */
preference: number;
/** The server that mail should be delivered to. */
exchange: string;
}
/** If {@linkcode Deno.resolveDns} is called with `"NAPTR"` record type
* specified, it will return an array of objects with this interface.
*
* @category Network */
export interface NAPTRRecord {
order: number;
preference: number;
flags: string;
services: string;
regexp: string;
replacement: string;
}
/** If {@linkcode Deno.resolveDns} is called with `"SOA"` record type
* specified, it will return an array of objects with this interface.
*
* @category Network */
export interface SOARecord {
mname: string;
rname: string;
serial: number;
refresh: number;
retry: number;
expire: number;
minimum: number;
}
/** If {@linkcode Deno.resolveDns} is called with `"SRV"` record type
* specified, it will return an array of objects with this interface.
*
* @category Network
*/
export interface SRVRecord {
priority: number;
weight: number;
port: number;
target: string;
}
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "A" | "AAAA" | "ANAME" | "CNAME" | "NS" | "PTR",
options?: ResolveDnsOptions,
): Promise<string[]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "CAA",
options?: ResolveDnsOptions,
): Promise<CAARecord[]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "MX",
options?: ResolveDnsOptions,
): Promise<MXRecord[]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "NAPTR",
options?: ResolveDnsOptions,
): Promise<NAPTRRecord[]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "SOA",
options?: ResolveDnsOptions,
): Promise<SOARecord[]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "SRV",
options?: ResolveDnsOptions,
): Promise<SRVRecord[]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: "TXT",
options?: ResolveDnsOptions,
): Promise<string[][]>;
/**
* Performs DNS resolution against the given query, returning resolved
* records.
*
* Fails in the cases such as:
*
* - the query is in invalid format.
* - the options have an invalid parameter. For example `nameServer.port` is
* beyond the range of 16-bit unsigned integer.
* - the request timed out.
*
* ```ts
* const a = await Deno.resolveDns("example.com", "A");
*
* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
* nameServer: { ipAddr: "8.8.8.8", port: 53 },
* });
* ```
*
* Requires `allow-net` permission.
*
* @tags allow-net
* @category Network
*/
export function resolveDns(
query: string,
recordType: RecordType,
options?: ResolveDnsOptions,
): Promise<
| string[]
| CAARecord[]
| MXRecord[]
| NAPTRRecord[]
| SOARecord[]
| SRVRecord[]
| string[][]
>;
/**
* Make the timer of the given `id` block the event loop from finishing.
*
* @category Timers
*/
export function refTimer(id: number): void;
/**
* Make the timer of the given `id` not block the event loop from finishing.
*
* @category Timers
*/
export function unrefTimer(id: number): void;
/**
* Returns the user id of the process on POSIX platforms. Returns null on Windows.
*
* ```ts
* console.log(Deno.uid());
* ```
*
* Requires `allow-sys` permission.
*
* @tags allow-sys
* @category Runtime Environment
*/
export function uid(): number | null;
/**
* Returns the group id of the process on POSIX platforms. Returns null on windows.
*
* ```ts
* console.log(Deno.gid());
* ```
*
* Requires `allow-sys` permission.
*
* @tags allow-sys
* @category Runtime Environment
*/
export function gid(): number | null;
/** Information for a HTTP request.
*
* @category HTTP Server
*/
export interface ServeHandlerInfo {
/** The remote address of the connection. */
remoteAddr: Deno.NetAddr;
}
/** A handler for HTTP requests. Consumes a request and returns a response.
*
* If a handler throws, the server calling the handler will assume the impact
* of the error is isolated to the individual request. It will catch the error
* and if necessary will close the underlying connection.
*
* @category HTTP Server
*/
export type ServeHandler = (
request: Request,
info: ServeHandlerInfo,
) => Response | Promise<Response>;
/** Options which can be set when calling {@linkcode Deno.serve}.
*
* @category HTTP Server
*/
export interface ServeOptions {
/** The port to listen on.
*
* @default {8000} */
port?: number;
/** A literal IP address or host name that can be resolved to an IP address.
*
* __Note about `0.0.0.0`__ While listening `0.0.0.0` works on all platforms,
* the browsers on Windows don't work with the address `0.0.0.0`.
* You should show the message like `server running on localhost:8080` instead of
* `server running on 0.0.0.0:8080` if your program supports Windows.
*
* @default {"0.0.0.0"} */
hostname?: string;
/** An {@linkcode AbortSignal} to close the server and all connections. */
signal?: AbortSignal;
/** Sets `SO_REUSEPORT` on POSIX systems. */
reusePort?: boolean;
/** The handler to invoke when route handlers throw an error. */
onError?: (error: unknown) => Response | Promise<Response>;
/** The callback which is called when the server starts listening. */
onListen?: (params: { hostname: string; port: number }) => void;
}
/** Additional options which are used when opening a TLS (HTTPS) server.
*
* @category HTTP Server
*/
export interface ServeTlsOptions extends ServeOptions {
/** Server private key in PEM format */
cert: string;
/** Cert chain in PEM format */
key: string;
}
/**
* @category HTTP Server
*/
export interface ServeInit {
/** The handler to invoke to process each incoming request. */
handler: ServeHandler;
}
/** An instance of the server created using `Deno.serve()` API.
*
* @category HTTP Server
*/
export interface HttpServer extends AsyncDisposable {
/** A promise that resolves once server finishes - eg. when aborted using
* the signal passed to {@linkcode ServeOptions.signal}.
*/
finished: Promise<void>;
/**
* Make the server block the event loop from finishing.
*
* Note: the server blocks the event loop from finishing by default.
* This method is only meaningful after `.unref()` is called.
*/
ref(): void;
/** Make the server not block the event loop from finishing. */
unref(): void;
}
/**
* @category HTTP Server
* @deprecated Use {@linkcode HttpServer} instead.
*/
export type Server = HttpServer;
/** Serves HTTP requests with the given handler.
*
* The below example serves with the port `8000` on hostname `"127.0.0.1"`.
*
* ```ts
* Deno.serve((_req) => new Response("Hello, world"));
* ```
*
* @category HTTP Server
*/
export function serve(handler: ServeHandler): HttpServer;
/** Serves HTTP requests with the given option bag and handler.
*
* You can specify an object with a port and hostname option, which is the
* address to listen on. The default is port `8000` on hostname `"127.0.0.1"`.
*
* You can change the address to listen on using the `hostname` and `port`
* options. The below example serves on port `3000` and hostname `"0.0.0.0"`.
*
* ```ts
* Deno.serve(
* { port: 3000, hostname: "0.0.0.0" },
* (_req) => new Response("Hello, world")
* );
* ```
*
* You can stop the server with an {@linkcode AbortSignal}. The abort signal
* needs to be passed as the `signal` option in the options bag. The server
* aborts when the abort signal is aborted. To wait for the server to close,
* await the promise returned from the `Deno.serve` API.
*
* ```ts
* const ac = new AbortController();
*
* const server = Deno.serve(
* { signal: ac.signal },
* (_req) => new Response("Hello, world")
* );
* server.finished.then(() => console.log("Server closed"));
*
* console.log("Closing server...");
* ac.abort();
* ```
*
* By default `Deno.serve` prints the message
* `Listening on http://<hostname>:<port>/` on listening. If you like to
* change this behavior, you can specify a custom `onListen` callback.
*
* ```ts
* Deno.serve({
* onListen({ port, hostname }) {
* console.log(`Server started at http://${hostname}:${port}`);
* // ... more info specific to your server ..
* },
* }, (_req) => new Response("Hello, world"));
* ```
*
* To enable TLS you must specify the `key` and `cert` options.
*
* ```ts
* const cert = "-----BEGIN CERTIFICATE-----\n...\n-----END CERTIFICATE-----\n";
* const key = "-----BEGIN PRIVATE KEY-----\n...\n-----END PRIVATE KEY-----\n";
* Deno.serve({ cert, key }, (_req) => new Response("Hello, world"));
* ```
*
* @category HTTP Server
*/
export function serve(
options: ServeOptions | ServeTlsOptions,
handler: ServeHandler,
): HttpServer;
/** Serves HTTP requests with the given option bag.
*
* You can specify an object with a port and hostname option, which is the
* address to listen on. The default is port `8000` on hostname `"127.0.0.1"`.
*
* ```ts
* const ac = new AbortController();
*
* const server = Deno.serve({
* port: 3000,
* hostname: "0.0.0.0",
* handler: (_req) => new Response("Hello, world"),
* signal: ac.signal,
* onListen({ port, hostname }) {
* console.log(`Server started at http://${hostname}:${port}`);
* },
* });
* server.finished.then(() => console.log("Server closed"));
*
* console.log("Closing server...");
* ac.abort();
* ```
*
* @category HTTP Server
*/
export function serve(
options: ServeInit & (ServeOptions | ServeTlsOptions),
): HttpServer;
}
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