Best JavaScript code snippet using wpt
writable-stream.js
Source:writable-stream.js  
...309  const state = stream._state;310  if (state === 'writable' || state === 'closing') {311    defaultWriterClosedPromiseReject(writer, releasedError);312  } else {313    defaultWriterClosedPromiseResetToRejected(writer, releasedError);314  }315  writer._closedPromise.catch(() => {});316  if (state === 'writable' &&317      WritableStreamDefaultControllerGetBackpressure(stream._writableStreamController) === true) {318    defaultWriterReadyPromiseReject(writer, releasedError);319  } else {320    defaultWriterReadyPromiseResetToRejected(writer, releasedError);321  }322  writer._readyPromise.catch(() => {});323  stream._writer = undefined;324  writer._ownerWritableStream = undefined;325}326function WritableStreamDefaultWriterWrite(writer, chunk) {327  const stream = writer._ownerWritableStream;328  assert(stream !== undefined);329  const state = stream._state;330  if (state === 'closed' || state === 'errored') {331    return Promise.reject(new TypeError(332      `The stream (in ${state} state) is not in the writable state and cannot be written to`));333  }334  assert(state === 'writable');335  const promise = WritableStreamAddWriteRequest(stream);336  WritableStreamDefaultControllerWrite(stream._writableStreamController, chunk);337  return promise;338}339class WritableStreamDefaultController {340  constructor(stream, underlyingSink, size, highWaterMark) {341    if (IsWritableStream(stream) === false) {342      throw new TypeError('WritableStreamDefaultController can only be constructed with a WritableStream instance');343    }344    if (stream._writableStreamController !== undefined) {345      throw new TypeError(346        'WritableStreamDefaultController instances can only be created by the WritableStream constructor');347    }348    this._controlledWritableStream = stream;349    this._underlyingSink = underlyingSink;350    this._queue = [];351    this._started = false;352    this._writing = false;353    const normalizedStrategy = ValidateAndNormalizeQueuingStrategy(size, highWaterMark);354    this._strategySize = normalizedStrategy.size;355    this._strategyHWM = normalizedStrategy.highWaterMark;356    const backpressure = WritableStreamDefaultControllerGetBackpressure(this);357    if (backpressure === true) {358      WritableStreamUpdateBackpressure(stream, backpressure);359    }360    const controller = this;361    const startResult = InvokeOrNoop(underlyingSink, 'start', [this]);362    Promise.resolve(startResult).then(363      () => {364        controller._started = true;365        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);366      },367      r => {368        WritableStreamDefaultControllerErrorIfNeeded(controller, r);369      }370    )371    .catch(rethrowAssertionErrorRejection);372  }373  error(e) {374    if (IsWritableStreamDefaultController(this) === false) {375      throw new TypeError(376        'WritableStreamDefaultController.prototype.error can only be used on a WritableStreamDefaultController');377    }378    const state = this._controlledWritableStream._state;379    if (state === 'closed' || state === 'errored') {380      throw new TypeError(`The stream is ${state} and so cannot be errored`);381    }382    WritableStreamDefaultControllerError(this, e);383  }384}385// Abstract operations implementing interface required by the WritableStream.386function WritableStreamDefaultControllerAbort(controller, reason) {387  controller._queue = [];388  const sinkAbortPromise = PromiseInvokeOrFallbackOrNoop(controller._underlyingSink, 'abort', [reason],389                                                         'close', [controller]);390  return sinkAbortPromise.then(() => undefined);391}392function WritableStreamDefaultControllerClose(controller) {393  EnqueueValueWithSize(controller._queue, 'close', 0);394  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);395}396function WritableStreamDefaultControllerGetDesiredSize(controller) {397  const queueSize = GetTotalQueueSize(controller._queue);398  return controller._strategyHWM - queueSize;399}400function WritableStreamDefaultControllerWrite(controller, chunk) {401  const stream = controller._controlledWritableStream;402  assert(stream._state === 'writable');403  let chunkSize = 1;404  if (controller._strategySize !== undefined) {405    try {406      chunkSize = controller._strategySize(chunk);407    } catch (chunkSizeE) {408      // TODO: Should we notify the sink of this error?409      WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);410      return;411    }412  }413  const writeRecord = { chunk };414  const lastBackpressure = WritableStreamDefaultControllerGetBackpressure(controller);415  try {416    EnqueueValueWithSize(controller._queue, writeRecord, chunkSize);417  } catch (enqueueE) {418    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);419    return;420  }421  if (stream._state === 'writable') {422    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);423    if (lastBackpressure !== backpressure) {424      WritableStreamUpdateBackpressure(stream, backpressure);425    }426  }427  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);428}429// Abstract operations for the WritableStreamDefaultController.430function IsWritableStreamDefaultController(x) {431  if (!typeIsObject(x)) {432    return false;433  }434  if (!Object.prototype.hasOwnProperty.call(x, '_underlyingSink')) {435    return false;436  }437  return true;438}439function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {440  if (controller._controlledWritableStream._state === 'closed' ||441      controller._controlledWritableStream._state === 'errored') {442    return;443  }444  if (controller._started === false) {445    return;446  }447  if (controller._writing === true) {448    return;449  }450  if (controller._queue.length === 0) {451    return;452  }453  const writeRecord = PeekQueueValue(controller._queue);454  if (writeRecord === 'close') {455    WritableStreamDefaultControllerProcessClose(controller);456  } else {457    WritableStreamDefaultControllerProcessWrite(controller, writeRecord.chunk);458  }459}460function WritableStreamDefaultControllerErrorIfNeeded(controller, e) {461  if (controller._controlledWritableStream._state === 'writable' ||462      controller._controlledWritableStream._state === 'closing') {463    WritableStreamDefaultControllerError(controller, e);464  }465}466function WritableStreamDefaultControllerProcessClose(controller) {467  const stream = controller._controlledWritableStream;468  assert(stream._state === 'closing', 'can\'t process final write record unless already closed');469  DequeueValue(controller._queue);470  assert(controller._queue.length === 0, 'queue must be empty once the final write record is dequeued');471  const sinkClosePromise = PromiseInvokeOrNoop(controller._underlyingSink, 'close', [controller]);472  sinkClosePromise.then(473    () => {474      if (stream._state !== 'closing') {475        return;476      }477      WritableStreamFulfillWriteRequest(stream);478      WritableStreamFinishClose(stream);479    },480    r => {481      WritableStreamDefaultControllerErrorIfNeeded(controller, r);482    }483  )484  .catch(rethrowAssertionErrorRejection);485}486function WritableStreamDefaultControllerProcessWrite(controller, chunk) {487  controller._writing = true;488  const sinkWritePromise = PromiseInvokeOrNoop(controller._underlyingSink, 'write', [chunk, controller]);489  sinkWritePromise.then(490    () => {491      const stream = controller._controlledWritableStream;492      const state = stream._state;493      if (state === 'errored' || state === 'closed') {494        return;495      }496      controller._writing = false;497      WritableStreamFulfillWriteRequest(stream);498      const lastBackpressure = WritableStreamDefaultControllerGetBackpressure(controller);499      DequeueValue(controller._queue);500      if (state !== 'closing') {501        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);502        if (lastBackpressure !== backpressure) {503          WritableStreamUpdateBackpressure(controller._controlledWritableStream, backpressure);504        }505      }506      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);507    },508    r => {509      WritableStreamDefaultControllerErrorIfNeeded(controller, r);510    }511  )512  .catch(rethrowAssertionErrorRejection);513}514function WritableStreamDefaultControllerGetBackpressure(controller) {515  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);516  return desiredSize <= 0;517}518// A client of WritableStreamDefaultController may use these functions directly to bypass state check.519function WritableStreamDefaultControllerError(controller, e) {520  const stream = controller._controlledWritableStream;521  assert(stream._state === 'writable' || stream._state === 'closing');522  WritableStreamError(stream, e);523  controller._queue = [];524}525// Helper functions for the WritableStream.526function streamBrandCheckException(name) {527  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);528}529// Helper functions for the WritableStreamDefaultWriter.530function defaultWriterBrandCheckException(name) {531  return new TypeError(532    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);533}534function defaultWriterLockException(name) {535  return new TypeError('Cannot ' + name + ' a stream using a released writer');536}537function defaultWriterClosedPromiseInitialize(writer) {538  writer._closedPromise = new Promise((resolve, reject) => {539    writer._closedPromise_resolve = resolve;540    writer._closedPromise_reject = reject;541  });542}543function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {544  writer._closedPromise = Promise.reject(reason);545  writer._closedPromise_resolve = undefined;546  writer._closedPromise_reject = undefined;547}548function defaultWriterClosedPromiseInitializeAsResolved(writer) {549  writer._closedPromise = Promise.resolve(undefined);550  writer._closedPromise_resolve = undefined;551  writer._closedPromise_reject = undefined;552}553function defaultWriterClosedPromiseReject(writer, reason) {554  assert(writer._closedPromise_resolve !== undefined);555  assert(writer._closedPromise_reject !== undefined);556  writer._closedPromise_reject(reason);557  writer._closedPromise_resolve = undefined;558  writer._closedPromise_reject = undefined;559}560function defaultWriterClosedPromiseResetToRejected(writer, reason) {561  assert(writer._closedPromise_resolve === undefined);562  assert(writer._closedPromise_reject === undefined);563  writer._closedPromise = Promise.reject(reason);564}565function defaultWriterClosedPromiseResolve(writer) {566  assert(writer._closedPromise_resolve !== undefined);567  assert(writer._closedPromise_reject !== undefined);568  writer._closedPromise_resolve(undefined);569  writer._closedPromise_resolve = undefined;570  writer._closedPromise_reject = undefined;571}572function defaultWriterReadyPromiseInitialize(writer) {573  writer._readyPromise = new Promise((resolve, reject) => {574    writer._readyPromise_resolve = resolve;...Using AI Code Generation
1var wptools = require('wptools');2wptools.defaultWriterClosedPromiseResetToRejected();3var wptools = require('wptools');4wptools.defaultWriterClosedPromiseResetToRejected();5var wptools = require('wptools');6wptools.defaultWriterClosedPromiseResetToRejected();7var wptools = require('wptools');8wptools.defaultWriterClosedPromiseResetToRejected();9var wptools = require('wptools');10wptools.defaultWriterClosedPromiseResetToRejected();11var wptools = require('wptools');12wptools.defaultWriterClosedPromiseResetToRejected();13var wptools = require('wptools');14wptools.defaultWriterClosedPromiseResetToRejected();15var wptools = require('wptools');16wptools.defaultWriterClosedPromiseResetToRejected();17var wptools = require('wptools');18wptools.defaultWriterClosedPromiseResetToRejected();19var wptools = require('wptools');20wptools.defaultWriterClosedPromiseResetToRejected();21var wptools = require('wptools');22wptools.defaultWriterClosedPromiseResetToRejected();Using AI Code Generation
1test(function() {2  var writer = new WritableStream().getWriter();3  var closedPromise = writer.closed;4  writer.releaseLock();5  assert_throws(new TypeError(), function() {6    writer.defaultWriterClosedPromiseResetToRejected();7  });8}, 'defaultWriterClosedPromiseResetToRejected should throw a TypeError when the writer is not locked to a WritableStream');9test(function() {10  var writer = new WritableStream().getWriter();11  var closedPromise = writer.closed;12  writer.releaseLock();13  assert_throws(new TypeError(), function() {14    writer.defaultWriterClosedPromiseResetToRejected();15  });16}, 'defaultWriterClosedPromiseResetToRejected should throw a TypeError when the writer is not locked to a WritableStream');17test(function() {18  var ws = new WritableStream();19  var writer = ws.getWriter();20  var closedPromise = writer.closed;21  writer.releaseLock();22  assert_throws(new TypeError(), function() {23    writer.defaultWriterClosedPromiseResetToRejected();24  });25}, 'defaultWriterClosedPromiseResetToRejected should throw a TypeError when the writer is not locked to a WritableStream');26test(function() {27  var ws = new WritableStream();28  var writer = ws.getWriter();29  var closedPromise = writer.closed;30  writer.releaseLock();31  assert_throws(new TypeError(), function() {32    writer.defaultWriterClosedPromiseResetToRejected();33  });34}, 'defaultWriterClosedPromiseResetToRejected should throw a TypeError when the writer is not locked to a WritableStream');35test(function() {36  var ws = new WritableStream();37  var writer = ws.getWriter();38  var closedPromise = writer.closed;39  writer.releaseLock();40  assert_throws(new TypeError(), function() {41    writer.defaultWriterClosedPromiseResetToRejected();42  });43}, 'defaultWriterClosedPromiseResetToRejected should throw a TypeError when the writer is not locked to a WritableStream');44test(function() {45  var ws = new WritableStream();46  var writer = ws.getWriter();47  var closedPromise = writer.closed;48  writer.releaseLock();49  assert_throws(new TypeError(), function() {50    writer.defaultWriterClosedPromiseResetToRejected();51  });52}, 'defaultWriterClosedPromiseResetToRejected should throw a TypeError when the writer is not locked to a WritableStream');Using AI Code Generation
1const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;2const writer = new WritableStreamDefaultWriter();3defaultWriterClosedPromiseResetToRejected(writer);4assert_equals(writer.closed._state, "rejected");5const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;6const writer = new WritableStreamDefaultWriter();7defaultWriterClosedPromiseResetToRejected(writer);8assert_equals(writer.closed._state, "rejected");9const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;10const writer = new WritableStreamDefaultWriter();11defaultWriterClosedPromiseResetToRejected(writer);12assert_equals(writer.closed._state, "rejected");13const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;14const writer = new WritableStreamDefaultWriter();15defaultWriterClosedPromiseResetToRejected(writer);16assert_equals(writer.closed._state, "rejected");17const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;18const writer = new WritableStreamDefaultWriter();19defaultWriterClosedPromiseResetToRejected(writer);20assert_equals(writer.closed._state, "rejected");21const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;22const writer = new WritableStreamDefaultWriter();23defaultWriterClosedPromiseResetToRejected(writer);24assert_equals(writer.closed._state, "rejected");25const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;26const writer = new WritableStreamDefaultWriter();27defaultWriterClosedPromiseResetToRejected(writer);28assert_equals(writer.closed._state, "rejected");29const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;30const writer = new WritableStreamDefaultWriter();31defaultWriterClosedPromiseResetToRejected(writer);32assert_equals(writer.closed._state, "rejected");Using AI Code Generation
1import { defaultWriterClosedPromiseResetToRejected } from './default-writer-closed-promise-reset-to-rejected.js';2test(function() {3  const ws = new WritableStream();4  const writer = ws.getWriter();5  writer.write('a');6  return defaultWriterClosedPromiseResetToRejected(writer, new TypeError('boo'));7}, 'defaultWriterClosedPromiseResetToRejected resolves when the writer\'s closed promise is rejected with a TypeError');8export function defaultWriterClosedPromiseResetToRejected(writer, reason) {9  const closedPromise = writer.closed;10  return writer.abort(reason)11    .then(() => closedPromise)12    .then(13      () => Promise.reject(new Error('closed promise should be rejected')),14      r => {15        assert_equals(r, reason, 'closed promise should be rejected with the given reason');16        assert_true(closedPromise !== writer.closed, 'closed promise should be reset');17      });18}Using AI Code Generation
1const defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;2const writer = new WritableStreamDefaultWriter(stream);3defaultWriterClosedPromiseResetToRejected(writer, new Error('error'));4writer.closed.then(() => console.log('closed')).catch((e) => console.log('error', e));5global.defaultWriterClosedPromiseResetToRejected = function(writer, e) {6  writer._closedPromise._reject(e);7}Using AI Code Generation
1var defaultWriterClosedPromiseResetToRejected = wpt.defaultWriterClosedPromiseResetToRejected;2var writer = new WritableStream().getWriter();3var closedPromise = defaultWriterClosedPromiseResetToRejected(writer, 'aReason');4closedPromise.then(5  () => console.log('fulfilled'),6  r => console.log('rejected with ' + r)7);Using AI Code Generation
1export default async function test() {2  const writer = new WritableStreamDefaultWriter(new WritableStream());3  writer.releaseLock();4  writer.closed.catch(() => {});5  writer.closed.then(() => {}, () => {});6  const defaultWriterClosedPromiseResetToRejected = writer.closed.then;7  await defaultWriterClosedPromiseResetToRejected();8}9export default async function test() {10  const writer = new WritableStreamDefaultWriter(new WritableStream());11  writer.releaseLock();12  writer.closed.catch(() => {});13  writer.closed.then(() => {}, () => {});14  const defaultWriterClosedPromiseResetToRejected = writer.closed.then;15  await defaultWriterClosedPromiseResetToRejected();16}17export default async function test() {18  const writer = new WritableStreamDefaultWriter(new WritableStream());19  writer.releaseLock();20  writer.closed.catch(() => {});21  writer.closed.then(() => {}, () => {});22  const defaultWriterClosedPromiseResetToRejected = writer.closed.then;23  await defaultWriterClosedPromiseResetToRejected();24}25export default async function test() {26  const writer = new WritableStreamDefaultWriter(new WritableStream());27  writer.releaseLock();28  writer.closed.catch(() => {});29  writer.closed.then(() => {}, () => {});30  const defaultWriterClosedPromiseResetToRejected = writer.closed.then;31  await defaultWriterClosedPromiseResetToRejected();32}33export default async function test() {34  const writer = new WritableStreamDefaultWriter(new WritableStream());35  writer.releaseLock();36  writer.closed.catch(() => {});37  writer.closed.then(() => {}, () => {});38  const defaultWriterClosedPromiseResetToRejected = writer.closed.then;39  await defaultWriterClosedPromiseResetToRejected();40}41export default async function test() {42  const writer = new WritableStreamDefaultWriter(new WritableStream());43  writer.releaseLock();44  writer.closed.catch(() => {});45  writer.closed.then(() => {}, () =>Using AI Code Generation
1import * as wpt from 'wpt-externs';2export default function defaultWriterClosedPromiseResetToRejected() {3  const writer = new wpt.WritableStreamDefaultWriter(new wpt.WritableStream());4  writer.closed.then(() => {5    console.log('closed');6  });7  writer.releaseLock();8  writer.closed.catch(() => {9    console.log('errored');10  });11}12import * as wpt from 'wpt-externs';13export default function defaultWriterClosedPromiseResetToRejected() {14  const writer = new wpt.WritableStreamDefaultWriter(new wpt.WritableStream());15  writer.closed.then(() => {16    console.log('closed');17  });18  writer.releaseLock();19  writer.closed.catch(() => {20    console.log('errored');21  });22}23import * as wpt from 'wpt-externs';24export default function defaultWriterClosedPromiseResetToRejected() {25  const writer = new wpt.WritableStreamDefaultWriter(new wpt.WritableStream());26  writer.closed.then(() => {27    console.log('closed');28  });29  writer.releaseLock();30  writer.closed.catch(() => {31    console.log('errored');32  });33}34import * as wpt from 'wpt-externs';35export default function defaultWriterClosedPromiseResetToRejected() {36  const writer = new wpt.WritableStreamDefaultWriter(new wpt.WritableStream());37  writer.closed.then(() => {38    console.log('closed');39  });40  writer.releaseLock();41  writer.closed.catch(() => {42    console.log('errored');43  });44}Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.
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