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How to use ReadableStreamReaderGenericCancel method in wpt

Best JavaScript code snippet using wpt

readable_stream_byob_reader.ts

Source:readable_stream_byob_reader.ts

...47    }48    if (this.ownerReadableStream === void 0) {49      return Promise.reject(new TypeError());50    }51    return ReadableStreamReaderGenericCancel(this, reason);52  }53  read<T extends ArrayBufferView>(54    view: T55  ): Promise<ReadableStreamReadResult<T>> {56    if (!IsReadableStreamBYOBReader(this)) {57      return Promise.reject(new TypeError());58    }59    if (this.ownerReadableStream === void 0) {60      return Promise.reject(new TypeError());61    }62    if (typeof view !== "object") {63      return Promise.reject(new TypeError());64    }65    if (!isArrayBufferView(view)) {...

readable_stream_async_iterator.ts

Source:readable_stream_async_iterator.ts

1// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.2import * as sym from "./symbols.ts";3import {4  isReadableStreamAsyncIterator,5  ReadableStreamAsyncIterator,6  readableStreamCreateReadResult,7  readableStreamReaderGenericCancel,8  readableStreamReaderGenericRelease,9  readableStreamDefaultReaderRead,10} from "./internals.ts";11import { assert } from "../../util.ts";12// eslint-disable-next-line @typescript-eslint/no-explicit-any13const AsyncIteratorPrototype: AsyncIterableIterator<any> = Object.getPrototypeOf(14  Object.getPrototypeOf(async function* () {}).prototype15);16export const ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIterator = Object.setPrototypeOf(17  {18    next(19      this: ReadableStreamAsyncIterator20      // eslint-disable-next-line @typescript-eslint/no-explicit-any21    ): Promise<ReadableStreamReadResult<any>> {22      if (!isReadableStreamAsyncIterator(this)) {23        return Promise.reject(24          new TypeError("invalid ReadableStreamAsyncIterator.")25        );26      }27      const reader = this[sym.asyncIteratorReader];28      if (!reader[sym.ownerReadableStream]) {29        return Promise.reject(30          new TypeError("reader owner ReadableStream is undefined.")31        );32      }33      return readableStreamDefaultReaderRead(reader).then((result) => {34        assert(typeof result === "object");35        const { done } = result;36        assert(typeof done === "boolean");37        if (done) {38          readableStreamReaderGenericRelease(reader);39        }40        const { value } = result;41        return readableStreamCreateReadResult(value, done, true);42      });43    },44    return(45      this: ReadableStreamAsyncIterator,46      // eslint-disable-next-line @typescript-eslint/no-explicit-any47      value?: any | PromiseLike<any>48      // eslint-disable-next-line @typescript-eslint/no-explicit-any49    ): Promise<ReadableStreamReadResult<any>> {50      if (!isReadableStreamAsyncIterator(this)) {51        return Promise.reject(52          new TypeError("invalid ReadableStreamAsyncIterator.")53        );54      }55      const reader = this[sym.asyncIteratorReader];56      if (!reader[sym.ownerReadableStream]) {57        return Promise.reject(58          new TypeError("reader owner ReadableStream is undefined.")59        );60      }61      if (reader[sym.readRequests].length) {62        return Promise.reject(63          new TypeError("reader has outstanding read requests.")64        );65      }66      if (!this[sym.preventCancel]) {67        const result = readableStreamReaderGenericCancel(reader, value);68        readableStreamReaderGenericRelease(reader);69        return result.then(() =>70          readableStreamCreateReadResult(value, true, true)71        );72      }73      readableStreamReaderGenericRelease(reader);74      return Promise.resolve(readableStreamCreateReadResult(value, true, true));75    },76  },77  AsyncIteratorPrototype...

readable_stream_default_reader.ts

Source:readable_stream_default_reader.ts

1// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.2import {3  Deferred,4  isReadableStream,5  isReadableStreamDefaultReader,6  isReadableStreamLocked,7  readableStreamDefaultReaderRead,8  readableStreamReaderGenericCancel,9  readableStreamReaderGenericInitialize,10  readableStreamReaderGenericRelease,11  setFunctionName,12} from "./internals.ts";13import { ReadableStreamImpl } from "./readable_stream.ts";14import * as sym from "./symbols.ts";15import { customInspect } from "../console.ts";16// eslint-disable-next-line @typescript-eslint/no-explicit-any17export class ReadableStreamDefaultReaderImpl<R = any>18  implements ReadableStreamDefaultReader<R> {19  [sym.closedPromise]: Deferred<void>;20  [sym.forAuthorCode]: boolean;21  [sym.ownerReadableStream]: ReadableStreamImpl<R>;22  [sym.readRequests]: Array<Deferred<ReadableStreamReadResult<R>>>;23  constructor(stream: ReadableStream<R>) {24    if (!isReadableStream(stream)) {25      throw new TypeError("stream is not a ReadableStream.");26    }27    if (isReadableStreamLocked(stream)) {28      throw new TypeError("stream is locked.");29    }30    readableStreamReaderGenericInitialize(this, stream);31    this[sym.readRequests] = [];32  }33  get closed(): Promise<void> {34    if (!isReadableStreamDefaultReader(this)) {35      return Promise.reject(36        new TypeError("Invalid ReadableStreamDefaultReader.")37      );38    }39    return (40      this[sym.closedPromise].promise ??41      Promise.reject(new TypeError("Invalid reader."))42    );43  }44  // eslint-disable-next-line @typescript-eslint/no-explicit-any45  cancel(reason?: any): Promise<void> {46    if (!isReadableStreamDefaultReader(this)) {47      return Promise.reject(48        new TypeError("Invalid ReadableStreamDefaultReader.")49      );50    }51    if (!this[sym.ownerReadableStream]) {52      return Promise.reject(new TypeError("Invalid reader."));53    }54    return readableStreamReaderGenericCancel(this, reason);55  }56  read(): Promise<ReadableStreamReadResult<R>> {57    if (!isReadableStreamDefaultReader(this)) {58      return Promise.reject(59        new TypeError("Invalid ReadableStreamDefaultReader.")60      );61    }62    if (!this[sym.ownerReadableStream]) {63      return Promise.reject(new TypeError("Invalid reader."));64    }65    return readableStreamDefaultReaderRead(this);66  }67  releaseLock(): void {68    if (!isReadableStreamDefaultReader(this)) {69      throw new TypeError("Invalid ReadableStreamDefaultReader.");70    }71    if (this[sym.ownerReadableStream] === undefined) {72      return;73    }74    if (this[sym.readRequests].length) {75      throw new TypeError("Cannot release lock with pending read requests.");76    }77    readableStreamReaderGenericRelease(this);78  }79  [customInspect](): string {80    return `${this.constructor.name} { closed: Promise }`;81  }82}...

Using AI Code Generation

1const rs = new ReadableStream({2  start(c) {3    c.enqueue(1);4    c.enqueue(2);5    c.enqueue(3);6  }7});8const reader = rs.getReader();9const read1 = reader.read();10const read2 = reader.read();11const read3 = reader.read();12const controller = reader._ownerReadableStreamController;13ReadableStreamReaderGenericCancel(reader, 'a');14ReadableStreamCancel(rs, 'b');15ReadableStreamDefaultControllerError(controller, 'c');16ReadableStreamDefaultControllerClose(controller);17read1.then(result => {18  assert_equals(result.value, 1);19  assert_equals(result.done, false);20}, e => {21  assert_unreached(e);22});23read2.then(result => {24  assert_equals(result.value, 2);25  assert_equals(result.done, false);26}, e => {27  assert_unreached(e);28});29read3.then(result => {30  assert_equals(result.value, 3);31  assert_equals(result.done, false);32}, e => {33  assert_unreached(e);34});35done();36function ReadableStreamGenericCancel(stream, reason) {37  stream._state = 'closed';38}39function ReadableStreamCancel(stream, reason) {40  ReadableStreamGenericCancel(stream, reason);41}42function ReadableStreamReaderGenericCancel(reader, reason) {43  ReadableStreamGenericCancel(reader._ownerReadableStream, reason);44}45function ReadableStreamDefaultControllerError(controller, e) {46  controller._errorSteps(e);47}48function ReadableStreamDefaultControllerClose(controller) {49  controller._closeSteps();50}

Using AI Code Generation

1var rs = new ReadableStream({2    pull: function(controller) {3        controller.enqueue(new Uint8Array([1,2,3]));4    }5});6var reader = rs.getReader({mode: 'byob'});7var controller = new AbortController();8var signal = controller.signal;9var promise = reader.read(new Uint8Array(3), {signal: signal});10promise.then(function(result) {11    assert_equals(result.value, undefined, 'value');12    assert_true(result.done, 'done');13}, function(error) {14    assert_unreached('should not reject');15});16controller.abort();17promise.then(function(result) {18    assert_unreached('should not resolve');19}, function(error) {20    assert_equals(error.name, 'AbortError', 'error name');21    assert_equals(error.message, 'The operation was aborted', 'error message');22});23done();

Using AI Code Generation

1var rs = new ReadableStream({2  start(controller) {3    controller.enqueue('a');4    controller.enqueue('b');5    controller.enqueue('c');6  }7});8var reader = rs.getReader();9reader.read().then(result => {10  console.log(result.value);11  return reader.cancel('reason');12}).then(() => {13  console.log('the stream has been canceled');14}).catch(e => {15  console.log('something went wrong: ' + e);16});

Using AI Code Generation

1var rs = new ReadableStream({2    start(c) {3        c.enqueue("a");4        c.close();5    }6});7var reader = rs.getReader();8var pull = reader.read();9pull.then(function(result) {10    console.log("result is: " + result);11    var cancel = reader.cancel();12    cancel.then(function(result) {13        console.log("cancel result is: " + result);14    });15});16var rs = new ReadableStream({17    start(c) {18        c.error("error");19    }20});21var reader = rs.getReader();22var cancel = reader.cancel();23cancel.then(function(result) {24    console.log("cancel result is: " + result);25});26@domenic: I'm not sure what the correct fix is here. The spec says: If the stream is already errored or closed, return a promise rejected with a TypeError. But I don't think we can change the spec to say: If the stream is already errored, return a promise rejected with a TypeError. because that would break the following code: var rs = new ReadableStream({ start(c) { c.error("error"); } }); var reader = rs.getReader(); var cancel = reader.cancel(); cancel

Using AI Code Generation

1const { ReadableStream, ReadableStreamReader } = require('stream/web');2const { WritableStream } = require('stream/web');3const { ReadableStreamGenericReader, ReadableStreamReaderGenericCancel } = require('stream/web');4const { ReadableStreamDefaultReader } = require('stream/web');5const { ReadableStreamBYOBReader } = require('stream/web');6const { ReadableStreamDefaultController } = require('stream/web');7const { ReadableByteStreamController } = require('stream/web');8const { ReadableStreamBYOBRequest } = require('stream/web');9const { CountQueuingStrategy } = require('stream/web');10const { ByteLengthQueuingStrategy } = require('stream/web');11const { WritableStreamDefaultWriter } = require('stream/web');12const { WritableStreamDefaultController } = require('stream/web');13const { TransformStream } = require('stream/web');14const { TransformStreamDefaultController } = require('stream/web');15const { ByteLengthQueuingStrategy } = require('stream/web');16const { WritableStreamDefaultWriter } = require('stream/web');17const { WritableStreamDefaultController } = require('stream/web');18const { TransformStream } = require('stream/web');19const { TransformStreamDefaultController } = require('stream/web');20const { ByteLengthQueuingStrategy } = require('stream/web');21const { WritableStreamDefaultWriter } = require('stream/web');22const { WritableStreamDefaultController } = require('stream/web');23const { TransformStream } = require('stream/web');24const { TransformStreamDefaultController } = require('stream/web');25const { ByteLengthQueuingStrategy } = require('stream/web');26const { WritableStreamDefaultWriter } = require('stream/web');27const { WritableStreamDefaultController } = require('stream/web');28const { TransformStream } = require('stream/web');29const { TransformStreamDefaultController } = require('stream/web');30const { ByteLengthQueuingStrategy } = require('stream/web');31const { WritableStreamDefaultWriter } = require('stream/web');32const { WritableStreamDefaultController } = require('stream/web');33const { TransformStream } = require('stream/web');34const { TransformStreamDefaultController } = require('stream/web');35const { ByteLengthQueuingStrategy } = require('stream/web');36const { WritableStreamDefaultWriter } = require('stream/web');37const { WritableStreamDefaultController

Using AI Code Generation

1const rs = new ReadableStream({2  start(controller) {3    controller.enqueue('a');4    controller.enqueue('b');5    controller.enqueue('c');6    controller.close();7  },8});9const reader = rs.getReader();10const readAll = async reader => {11  let result = await reader.read();12  const chunks = [];13  while (!result.done) {14    chunks.push(result.value);15    result = await reader.read();16  }17  return chunks;18};19readAll(reader).then(chunks => {20  assert_array_equals(chunks, ['a', 'b', 'c'], 'The data read should be the same as the data enqueued');21  console.log('The data read should be the same as the data enqueued');22}).catch(e => {23  t.error(e, 'Unexpected error');24  t.done();25});26const reader2 = rs.getReader();27const readAndCancel = async reader => {28  const result1 = await reader.read();29  assert_equals(result1.value, 'a', 'chunk read should be "a"');30  console.log('chunk read should be "a"');31  const result2 = await reader.cancel();32  assert_equals(result2, undefined, 'cancel() should fulfill with undefined');33  console.log('cancel() should fulfill with undefined');34};35readAndCancel(reader2).catch(e => {36  t.error(e, 'Unexpected error');37  t.done();38});39const reader3 = rs.getReader();40const readAndCancelWithReason = async reader => {41  const result1 = await reader.read();42  assert_equals(result1.value, 'a', 'chunk read should be "a"');43  console.log('chunk read should be "a"');44  const result2 = await reader.cancel('test reason');45  assert_equals(result2, undefined, 'cancel() should fulfill with undefined');46  console.log('cancel() should fulfill with undefined');47};48readAndCancelWithReason(reader3).catch(e => {49  t.error(e, 'Unexpected error');50  t.done();51});

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