fix: inspecting prototypes of built-ins with custom inspect implementations should not throw (#11308)

cli/tests/unit/blob_test.ts

@@ -1,5 +1,10 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals, unitTest } from "./test_util.ts";
+import {
+  assert,
+  assertEquals,
+  assertStringIncludes,
+  unitTest,
+} from "./test_util.ts";
 import { concat } from "../../../test_util/std/bytes/mod.ts";
 
 unitTest(function blobString(): void {
@@ -104,3 +109,12 @@ unitTest(function blobConstructorNameIsBlob(): void {
   const blob = new Blob();
   assertEquals(blob.constructor.name, "Blob");
 });
+
+unitTest(function blobCustomInspectFunction(): void {
+  const blob = new Blob();
+  assertEquals(
+    Deno.inspect(blob),
+    `Blob { size: 0, type: "" }`,
+  );
+  assertStringIncludes(Deno.inspect(Blob.prototype), "Blob");
+});

cli/tests/unit/dom_exception_test.ts

@@ -0,0 +1,10 @@
+import { assertEquals, assertStringIncludes, unitTest } from "./test_util.ts";
+
+unitTest(function customInspectFunction(): void {
+  const blob = new DOMException("test");
+  assertEquals(
+    Deno.inspect(blob),
+    `DOMException: test`,
+  );
+  assertStringIncludes(Deno.inspect(DOMException.prototype), "DOMException");
+});

cli/tests/unit/performance_test.ts

@@ -2,6 +2,7 @@
 import {
   assert,
   assertEquals,
+  assertStringIncludes,
   assertThrows,
   deferred,
   unitTest,
@@ -81,6 +82,32 @@ unitTest(function performanceMeasure() {
   });
 });
 
+unitTest(function performanceCustomInspectFunction(): void {
+  assertStringIncludes(Deno.inspect(performance), "Performance");
+  assertStringIncludes(
+    Deno.inspect(Performance.prototype),
+    "Performance",
+  );
+});
+
+unitTest(function performanceMarkCustomInspectFunction(): void {
+  const mark1 = performance.mark("mark1");
+  assertStringIncludes(Deno.inspect(mark1), "PerformanceMark");
+  assertStringIncludes(
+    Deno.inspect(PerformanceMark.prototype),
+    "PerformanceMark",
+  );
+});
+
+unitTest(function performanceMeasureCustomInspectFunction(): void {
+  const measure1 = performance.measure("measure1");
+  assertStringIncludes(Deno.inspect(measure1), "PerformanceMeasure");
+  assertStringIncludes(
+    Deno.inspect(PerformanceMeasure.prototype),
+    "PerformanceMeasure",
+  );
+});
+
 unitTest(function performanceIllegalConstructor() {
   assertThrows(() => new Performance(), TypeError, "Illegal constructor");
   assertEquals(Performance.length, 0);

cli/tests/unit/request_test.ts

@@ -1,5 +1,5 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
-import { assertEquals, unitTest } from "./test_util.ts";
+import { assertEquals, assertStringIncludes, unitTest } from "./test_util.ts";
 
 unitTest(async function fromInit(): Promise<void> {
   const req = new Request("http://foo/", {
@@ -66,4 +66,5 @@ unitTest(function customInspectFunction(): void {
   url: "https://example.com/"
 }`,
   );
+  assertStringIncludes(Deno.inspect(Request.prototype), "Request");
 });

cli/tests/unit/response_test.ts

@@ -1,5 +1,10 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals, unitTest } from "./test_util.ts";
+import {
+  assert,
+  assertEquals,
+  assertStringIncludes,
+  unitTest,
+} from "./test_util.ts";
 
 unitTest(async function responseText() {
   const response = new Response("hello world");
@@ -67,4 +72,5 @@ unitTest(function customInspectFunction(): void {
   url: ""
 }`,
   );
+  assertStringIncludes(Deno.inspect(Response.prototype), "Response");
 });

extensions/console/02_console.js

@@ -87,6 +87,10 @@
     MathFloor,
     Number,
     NumberPrototypeToString,
+    Proxy,
+    ReflectGet,
+    ReflectGetOwnPropertyDescriptor,
+    ReflectGetPrototypeOf,
     WeakMap,
     WeakSet,
   } = window.__bootstrap.primordials;
@@ -1953,6 +1957,58 @@
     });
   }
 
+  /** Creates a proxy that represents a subset of the properties
+   * of the original object optionally without evaluating the properties
+   * in order to get the values. */
+  function createFilteredInspectProxy({ object, keys, evaluate }) {
+    return new Proxy({}, {
+      get(_target, key) {
+        if (key === SymbolToStringTag) {
+          return object.constructor?.name;
+        } else if (ArrayPrototypeIncludes(keys, key)) {
+          return ReflectGet(object, key);
+        } else {
+          return undefined;
+        }
+      },
+      getOwnPropertyDescriptor(_target, key) {
+        if (!ArrayPrototypeIncludes(keys, key)) {
+          return undefined;
+        } else if (evaluate) {
+          return getEvaluatedDescriptor(object, key);
+        } else {
+          return getDescendantPropertyDescriptor(object, key) ??
+            getEvaluatedDescriptor(object, key);
+        }
+      },
+      has(_target, key) {
+        return ArrayPrototypeIncludes(keys, key);
+      },
+      ownKeys() {
+        return keys;
+      },
+    });
+
+    function getDescendantPropertyDescriptor(object, key) {
+      let propertyDescriptor = ReflectGetOwnPropertyDescriptor(object, key);
+      if (!propertyDescriptor) {
+        const prototype = ReflectGetPrototypeOf(object);
+        if (prototype) {
+          propertyDescriptor = getDescendantPropertyDescriptor(prototype, key);
+        }
+      }
+      return propertyDescriptor;
+    }
+
+    function getEvaluatedDescriptor(object, key) {
+      return {
+        configurable: true,
+        enumerable: true,
+        value: object[key],
+      };
+    }
+  }
+
   // A helper function that will bind our own console implementation
   // with default implementation of Console from V8. This will cause
   // console messages to be piped to inspector console.
@@ -1997,5 +2053,6 @@
     customInspect,
     inspect,
     wrapConsole,
+    createFilteredInspectProxy,
   };
 })(this);

extensions/console/internal.d.ts

@@ -0,0 +1,16 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
+/// <reference no-default-lib="true" />
+/// <reference lib="esnext" />
+
+declare namespace globalThis {
+  declare namespace __bootstrap {
+    declare namespace console {
+      declare function createFilteredInspectProxy<TObject>(params: {
+        object: TObject;
+        keys: (keyof TObject)[];
+        evaluate: boolean;
+      }): Record<string, unknown>;
+    }
+  }
+}

extensions/fetch/23_request.js

@@ -12,6 +12,7 @@
 
 ((window) => {
   const webidl = window.__bootstrap.webidl;
+  const consoleInternal = window.__bootstrap.console;
   const { HTTP_TOKEN_CODE_POINT_RE, byteUpperCase } = window.__bootstrap.infra;
   const { URL } = window.__bootstrap.url;
   const { guardFromHeaders } = window.__bootstrap.headers;
@@ -393,14 +394,17 @@
     }
 
     [SymbolFor("Deno.customInspect")](inspect) {
-      const inner = {
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        bodyUsed: this.bodyUsed,
+        object: this,
-        headers: this.headers,
+        evaluate: this instanceof Request,
-        method: this.method,
+        keys: [
-        redirect: this.redirect,
+          "bodyUsed",
-        url: this.url,
+          "headers",
-      };
+          "method",
-      return `Request ${inspect(inner)}`;
+          "redirect",
+          "url",
+        ],
+      }));
     }
   }
 

extensions/fetch/23_response.js

@@ -13,6 +13,7 @@
 
 ((window) => {
   const webidl = window.__bootstrap.webidl;
+  const consoleInternal = window.__bootstrap.console;
   const { HTTP_TAB_OR_SPACE, regexMatcher } = window.__bootstrap.infra;
   const { extractBody, mixinBody } = window.__bootstrap.fetchBody;
   const { getLocationHref } = window.__bootstrap.location;
@@ -377,17 +378,20 @@
     }
 
     [SymbolFor("Deno.customInspect")](inspect) {
-      const inner = {
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        body: this.body,
+        object: this,
-        bodyUsed: this.bodyUsed,
+        evaluate: this instanceof Response,
-        headers: this.headers,
+        keys: [
-        ok: this.ok,
+          "body",
-        redirected: this.redirected,
+          "bodyUsed",
-        status: this.status,
+          "headers",
-        statusText: this.statusText,
+          "ok",
-        url: this.url,
+          "redirected",
-      };
+          "status",
-      return `Response ${inspect(inner)}`;
+          "statusText",
+          "url",
+        ],
+      }));
     }
   }
 

extensions/timers/02_performance.js

@@ -16,6 +16,7 @@
   } = window.__bootstrap.primordials;
 
   const { webidl, structuredClone } = window.__bootstrap;
+  const consoleInternal = window.__bootstrap.console;
   const { opNow } = window.__bootstrap.timers;
   const { DOMException } = window.__bootstrap.domException;
 
@@ -175,7 +176,16 @@
     }
 
     [customInspect](inspect) {
-      return `${this.constructor.name} ${inspect(this.toJSON())}`;
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof PerformanceEntry,
+        keys: [
+          "name",
+          "entryType",
+          "startTime",
+          "duration",
+        ],
+      }));
     }
   }
   webidl.configurePrototype(PerformanceEntry);
@@ -235,7 +245,17 @@
     }
 
     [customInspect](inspect) {
-      return `${this.constructor.name} ${inspect(this.toJSON())}`;
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof PerformanceMark,
+        keys: [
+          "name",
+          "entryType",
+          "startTime",
+          "duration",
+          "detail",
+        ],
+      }));
     }
   }
   webidl.configurePrototype(PerformanceMark);
@@ -283,7 +303,17 @@
     }
 
     [customInspect](inspect) {
-      return `${this.constructor.name} ${inspect(this.toJSON())}`;
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof PerformanceMeasure,
+        keys: [
+          "name",
+          "entryType",
+          "startTime",
+          "duration",
+          "detail",
+        ],
+      }));
     }
   }
   webidl.configurePrototype(PerformanceMeasure);
@@ -516,7 +546,11 @@
     }
 
     [customInspect](inspect) {
-      return `${this.constructor.name} ${inspect(this.toJSON())}`;
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof Performance,
+        keys: [],
+      }));
     }
 
     get [SymbolToStringTag]() {

extensions/web/01_dom_exception.js

@@ -17,6 +17,7 @@
     ObjectSetPrototypeOf,
   } = window.__bootstrap.primordials;
   const webidl = window.__bootstrap.webidl;
+  const consoleInternal = window.__bootstrap.console;
 
   // Defined in WebIDL 4.3.
   // https://heycam.github.io/webidl/#idl-DOMException
@@ -109,8 +110,20 @@
       return "DOMException";
     }
 
-    [Symbol.for("Deno.customInspect")]() {
+    [Symbol.for("Deno.customInspect")](inspect) {
+      if (this instanceof DOMException) {
         return `DOMException: ${this.#message}`;
+      } else {
+        return inspect(consoleInternal.createFilteredInspectProxy({
+          object: this,
+          evaluate: false,
+          keys: [
+            "message",
+            "name",
+            "code",
+          ],
+        }));
+      }
     }
   }
 

extensions/web/02_event.js

@@ -9,6 +9,7 @@
 ((window) => {
   const webidl = window.__bootstrap.webidl;
   const { DOMException } = window.__bootstrap.domException;
+  const consoleInternal = window.__bootstrap.console;
   const {
     ArrayPrototypeFilter,
     ArrayPrototypeIncludes,
@@ -28,10 +29,7 @@
     ObjectCreate,
     ObjectDefineProperty,
     ObjectGetOwnPropertyDescriptor,
-    Proxy,
     ReflectDefineProperty,
-    ReflectGet,
-    ReflectGetOwnPropertyDescriptor,
     Symbol,
     SymbolFor,
     SymbolToStringTag,
@@ -175,7 +173,11 @@
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
-      return inspect(buildFilteredPropertyInspectObject(this, EVENT_PROPS));
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof Event,
+        keys: EVENT_PROPS,
+      }));
     }
 
     get type() {
@@ -397,43 +399,6 @@
     }
   }
 
-  function buildFilteredPropertyInspectObject(object, keys) {
-    // forward the subset of properties from `object` without evaluating
-    // as evaluation could lead to an error, which is better handled
-    // in the inspect code
-    return new Proxy({}, {
-      get(_target, key) {
-        if (key === SymbolToStringTag) {
-          return object.constructor?.name;
-        } else if (ArrayPrototypeIncludes(keys, key)) {
-          return ReflectGet(object, key);
-        } else {
-          return undefined;
-        }
-      },
-      getOwnPropertyDescriptor(_target, key) {
-        if (!ArrayPrototypeIncludes(keys, key)) {
-          return undefined;
-        }
-
-        return ReflectGetOwnPropertyDescriptor(object, key) ??
-          (object.prototype &&
-            ReflectGetOwnPropertyDescriptor(object.prototype, key)) ??
-          {
-            configurable: true,
-            enumerable: true,
-            value: object[key],
-          };
-      },
-      has(_target, key) {
-        return ArrayPrototypeIncludes(keys, key);
-      },
-      ownKeys() {
-        return keys;
-      },
-    });
-  }
-
   function defineEnumerableProps(
     Ctor,
     props,
@@ -1097,14 +1062,18 @@
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
-      return inspect(buildFilteredPropertyInspectObject(this, [
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof ErrorEvent,
+        keys: [
           ...EVENT_PROPS,
           "message",
           "filename",
           "lineno",
           "colno",
           "error",
-      ]));
+        ],
+      }));
     }
   }
 
@@ -1151,12 +1120,16 @@
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
-      return inspect(buildFilteredPropertyInspectObject(this, [
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof CloseEvent,
+        keys: [
           ...EVENT_PROPS,
           "wasClean",
           "code",
           "reason",
-      ]));
+        ],
+      }));
     }
   }
 
@@ -1179,12 +1152,16 @@
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
-      return inspect(buildFilteredPropertyInspectObject(this, [
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof MessageEvent,
+        keys: [
           ...EVENT_PROPS,
           "data",
           "origin",
           "lastEventId",
-      ]));
+        ],
+      }));
     }
   }
 
@@ -1209,10 +1186,14 @@
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
-      return inspect(buildFilteredPropertyInspectObject(this, [
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof CustomEvent,
+        keys: [
           ...EVENT_PROPS,
           "detail",
-      ]));
+        ],
+      }));
     }
   }
 
@@ -1232,12 +1213,16 @@
     }
 
     [SymbolFor("Deno.privateCustomInspect")](inspect) {
-      return inspect(buildFilteredPropertyInspectObject(this, [
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof ProgressEvent,
+        keys: [
           ...EVENT_PROPS,
           "lengthComputable",
           "loaded",
           "total",
-      ]));
+        ],
+      }));
     }
   }
 

extensions/web/06_streams.js

@@ -36,6 +36,7 @@
     WeakMapPrototypeHas,
     WeakMapPrototypeSet,
   } = globalThis.__bootstrap.primordials;
+  const consoleInternal = window.__bootstrap.console;
   const { DOMException } = window.__bootstrap.domException;
 
   class AssertionError extends Error {
@@ -3018,9 +3019,14 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        inspect({ highWaterMark: this.highWaterMark, size: this.size })
+        object: this,
-      }`;
+        evaluate: this instanceof ByteLengthQueuingStrategy,
+        keys: [
+          "highWaterMark",
+          "size",
+        ],
+      }));
     }
 
     get [Symbol.toStringTag]() {
@@ -3069,9 +3075,14 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        inspect({ highWaterMark: this.highWaterMark, size: this.size })
+        object: this,
-      }`;
+        evaluate: this instanceof CountQueuingStrategy,
+        keys: [
+          "highWaterMark",
+          "size",
+        ],
+      }));
     }
 
     get [Symbol.toStringTag]() {
@@ -3561,9 +3572,11 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        inspect({ desiredSize: this.desiredSize })
+        object: this,
-      }`;
+        evaluate: this instanceof ReadableByteStreamController,
+        keys: ["desiredSize"],
+      }));
     }
 
     get [Symbol.toStringTag]() {
@@ -3684,9 +3697,11 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        inspect({ desiredSize: this.desiredSize })
+        object: this,
-      }`;
+        evaluate: this instanceof ReadableStreamDefaultController,
+        keys: ["desiredSize"],
+      }));
     }
 
     get [Symbol.toStringTag]() {
@@ -3905,9 +3920,11 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        inspect({ desiredSize: this.desiredSize })
+        object: this,
-      }`;
+        evaluate: this instanceof TransformStreamDefaultController,
+        keys: ["desiredSize"],
+      }));
     }
 
     get [Symbol.toStringTag]() {
@@ -4182,13 +4199,15 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${
+      return inspect(consoleInternal.createFilteredInspectProxy({
-        inspect({
+        object: this,
-          closed: this.closed,
+        evaluate: this instanceof WritableStreamDefaultWriter,
-          desiredSize: this.desiredSize,
+        keys: [
-          ready: this.ready,
+          "closed",
-        })
+          "desiredSize",
-      }`;
+          "ready",
+        ],
+      }));
     }
 
     get [Symbol.toStringTag]() {
@@ -4240,7 +4259,11 @@
     }
 
     [Symbol.for("Deno.customInspect")](inspect) {
-      return `${this.constructor.name} ${inspect({})}`;
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof WritableStreamDefaultController,
+        keys: [],
+      }));
     }
 
     get [Symbol.toStringTag]() {

extensions/web/09_file.js

@@ -34,6 +34,7 @@
     TypeError,
     Uint8Array,
   } = window.__bootstrap.primordials;
+  const consoleInternal = window.__bootstrap.console;
 
   // TODO(lucacasonato): this needs to not be hardcoded and instead depend on
   // host os.
@@ -362,7 +363,14 @@
     }
 
     [SymbolFor("Deno.customInspect")](inspect) {
-      return `Blob ${inspect({ size: this.size, type: this.#type })}`;
+      return inspect(consoleInternal.createFilteredInspectProxy({
+        object: this,
+        evaluate: this instanceof Blob,
+        keys: [
+          "size",
+          "type",
+        ],
+      }));
     }
   }