Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

How to use makeWaitForNextTask method in Playwright Internal

Best JavaScript code snippet using playwright-internal

index.js

Source:index.js

...45 * See the License for the specific language governing permissions and46 * limitations under the License.47 */48// See https://joel.tools/microtasks/49function makeWaitForNextTask() {50  // As of Mar 2021, Electron v12 doesn't create new task with `setImmediate` despite51  // using Node 14 internally, so we fallback to `setTimeout(0)` instead.52  // @see https://github.com/electron/electron/issues/2826153  if (process.versions.electron) return callback => setTimeout(callback, 0);54  if (parseInt(process.versions.node, 10) >= 11) return setImmediate; // Unlike Node 11, Node 10 and less have a bug with Task and MicroTask execution order:55  // - https://github.com/nodejs/node/issues/2225756  //57  // So we can't simply run setImmediate to dispatch code in a following task.58  // However, we can run setImmediate from-inside setImmediate to make sure we're getting59  // in the following task.60  let spinning = false;61  const callbacks = [];62  const loop = () => {63    const callback = callbacks.shift();...

utils.js

Source:utils.js

...18import * as util from 'util'19import * as crypto from 'crypto'20const mkdirAsync = util.promisify(fs.mkdir.bind(fs))21// See https://joel.tools/microtasks/22export function makeWaitForNextTask() {23  if (parseInt(process.versions.node, 10) >= 11) return setImmediate24  // Unlike Node 11, Node 10 and less have a bug with Task and MicroTask execution order:25  // - https://github.com/nodejs/node/issues/2225726  //27  // So we can't simply run setImmediate to dispatch code in a following task.28  // However, we can run setImmediate from-inside setImmediate to make sure we're getting29  // in the following task.30  let spinning = false31  const callbacks = []32  const loop = () => {33    const callback = callbacks.shift()34    if (!callback) {35      spinning = false36      return...

playwrightClient.js

Source:playwrightClient.js

1"use strict";2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.PlaywrightClient = void 0;6var _ws = _interopRequireDefault(require("ws"));7var _connection = require("../client/connection");8var _utils = require("../utils/utils");9function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }10/**11 * Copyright (c) Microsoft Corporation.12 *13 * Licensed under the Apache License, Version 2.0 (the "License");14 * you may not use this file except in compliance with the License.15 * You may obtain a copy of the License at16 *17 * http://www.apache.org/licenses/LICENSE-2.018 *19 * Unless required by applicable law or agreed to in writing, software20 * distributed under the License is distributed on an "AS IS" BASIS,21 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.22 * See the License for the specific language governing permissions and23 * limitations under the License.24 */25class PlaywrightClient {26  static async connect(options) {27    const {28      wsEndpoint,29      timeout = 3000030    } = options;31    const connection = new _connection.Connection();32    connection.markAsRemote();33    const ws = new _ws.default(wsEndpoint);34    const waitForNextTask = (0, _utils.makeWaitForNextTask)();35    connection.onmessage = message => {36      if (ws.readyState === 237      /** CLOSING */38      || ws.readyState === 339      /** CLOSED */40      ) throw new Error('PlaywrightClient: writing to closed WebSocket connection');41      ws.send(JSON.stringify(message));42    };43    ws.on('message', message => waitForNextTask(() => connection.dispatch(JSON.parse(message.toString()))));44    const errorPromise = new Promise((_, reject) => ws.on('error', error => reject(error)));45    const closePromise = new Promise((_, reject) => ws.on('close', () => reject(new Error('Connection closed'))));46    const playwrightClientPromise = new Promise((resolve, reject) => {47      let playwright;48      ws.on('open', async () => {49        playwright = await connection.initializePlaywright();50        resolve(new PlaywrightClient(playwright, ws));51      });52      ws.on('close', (code, reason) => connection.close(reason));53    });54    let timer;55    try {56      await Promise.race([playwrightClientPromise, errorPromise, closePromise, new Promise((_, reject) => timer = setTimeout(() => reject(`Timeout of ${timeout}ms exceeded while connecting.`), timeout))]);57      return await playwrightClientPromise;58    } finally {59      clearTimeout(timer);60    }61  }62  constructor(playwright, ws) {63    this._playwright = void 0;64    this._ws = void 0;65    this._closePromise = void 0;66    this._playwright = playwright;67    this._ws = ws;68    this._closePromise = new Promise(f => ws.on('close', f));69  }70  playwright() {71    return this._playwright;72  }73  async close() {74    this._ws.close();75    await this._closePromise;76  }77}...

transport.js

Source:transport.js

1"use strict";2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.Transport = void 0;6var _utils = require("../utils/utils");7/**8 * Copyright (c) Microsoft Corporation.9 *10 * Licensed under the Apache License, Version 2.0 (the "License");11 * you may not use this file except in compliance with the License.12 * You may obtain a copy of the License at13 *14 * http://www.apache.org/licenses/LICENSE-2.015 *16 * Unless required by applicable law or agreed to in writing, software17 * distributed under the License is distributed on an "AS IS" BASIS,18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.19 * See the License for the specific language governing permissions and20 * limitations under the License.21 */22class Transport {23  constructor(pipeWrite, pipeRead, closeable, endian = 'le') {24    this._pipeWrite = void 0;25    this._data = Buffer.from([]);26    this._waitForNextTask = (0, _utils.makeWaitForNextTask)();27    this._closed = false;28    this._bytesLeft = 0;29    this.onmessage = void 0;30    this.onclose = void 0;31    this._endian = void 0;32    this._closeableStream = void 0;33    this._pipeWrite = pipeWrite;34    this._endian = endian;35    this._closeableStream = closeable;36    pipeRead.on('data', buffer => this._dispatch(buffer));37    pipeRead.on('close', () => {38      this._closed = true;39      if (this.onclose) this.onclose();40    });41    this.onmessage = undefined;42    this.onclose = undefined;43  }44  send(message) {45    if (this._closed) throw new Error('Pipe has been closed');46    const data = Buffer.from(message, 'utf-8');47    const dataLength = Buffer.alloc(4);48    if (this._endian === 'be') dataLength.writeUInt32BE(data.length, 0);else dataLength.writeUInt32LE(data.length, 0);49    this._pipeWrite.write(dataLength);50    this._pipeWrite.write(data);51  }52  close() {53    // Let it throw.54    this._closeableStream.close();55  }56  _dispatch(buffer) {57    this._data = Buffer.concat([this._data, buffer]);58    while (true) {59      if (!this._bytesLeft && this._data.length < 4) {60        // Need more data.61        break;62      }63      if (!this._bytesLeft) {64        this._bytesLeft = this._endian === 'be' ? this._data.readUInt32BE(0) : this._data.readUInt32LE(0);65        this._data = this._data.slice(4);66      }67      if (!this._bytesLeft || this._data.length < this._bytesLeft) {68        // Need more data.69        break;70      }71      const message = this._data.slice(0, this._bytesLeft);72      this._data = this._data.slice(this._bytesLeft);73      this._bytesLeft = 0;74      this._waitForNextTask(() => {75        if (this.onmessage) this.onmessage(message.toString('utf-8'));76      });77    }78  }79}...

pipeTransport.js

Source:pipeTransport.js

1"use strict";2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.PipeTransport = void 0;6var _utils = require("../utils/utils");7var _debugLogger = require("../utils/debugLogger");8/**9 * Copyright 2018 Google Inc. All rights reserved.10 * Modifications copyright (c) Microsoft Corporation.11 *12 * Licensed under the Apache License, Version 2.0 (the "License");13 * you may not use this file except in compliance with the License.14 * You may obtain a copy of the License at15 *16 *     http://www.apache.org/licenses/LICENSE-2.017 *18 * Unless required by applicable law or agreed to in writing, software19 * distributed under the License is distributed on an "AS IS" BASIS,20 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.21 * See the License for the specific language governing permissions and22 * limitations under the License.23 */24class PipeTransport {25  constructor(pipeWrite, pipeRead) {26    this._pipeWrite = void 0;27    this._pendingMessage = '';28    this._waitForNextTask = (0, _utils.makeWaitForNextTask)();29    this._closed = false;30    this.onmessage = void 0;31    this.onclose = void 0;32    this._pipeWrite = pipeWrite;33    pipeRead.on('data', buffer => this._dispatch(buffer));34    pipeRead.on('close', () => {35      this._closed = true;36      if (this.onclose) this.onclose.call(null);37    });38    pipeRead.on('error', e => _debugLogger.debugLogger.log('error', e));39    pipeWrite.on('error', e => _debugLogger.debugLogger.log('error', e));40    this.onmessage = undefined;41    this.onclose = undefined;42  }43  send(message) {44    if (this._closed) throw new Error('Pipe has been closed');45    this._pipeWrite.write(JSON.stringify(message));46    this._pipeWrite.write('\0');47  }48  close() {49    throw new Error('unimplemented');50  }51  _dispatch(buffer) {52    let end = buffer.indexOf('\0');53    if (end === -1) {54      this._pendingMessage += buffer.toString();55      return;56    }57    const message = this._pendingMessage + buffer.toString(undefined, 0, end);58    this._waitForNextTask(() => {59      if (this.onmessage) this.onmessage.call(null, JSON.parse(message));60    });61    let start = end + 1;62    end = buffer.indexOf('\0', start);63    while (end !== -1) {64      const message = buffer.toString(undefined, start, end);65      this._waitForNextTask(() => {66        if (this.onmessage) this.onmessage.call(null, JSON.parse(message));67      });68      start = end + 1;69      end = buffer.indexOf('\0', start);70    }71    this._pendingMessage = buffer.toString(undefined, start);72  }73}...

Using AI Code Generation

1const { makeWaitForNextTask } = require('@playwright/test/lib/utils/stackTrace');2const { test } = require('@playwright/test');3test('test', async ({ page }) => {4  await page.click('text=Get started');5  await page.waitForSelector('text=Install with npm');6  await page.click('text=Install with npm');7  await page.waitForSelector('text=Playwright is a Node library');8  await makeWaitForNextTask();9  await page.click('text=Playwright is a Node library');10  await page.waitForSelector('text=Playwright is a Node library');11  await makeWaitForNextTask();12  await page.click('text=Playwright is a Node library');13  await page.waitForSelector('text=Playwright is a Node library');14  await makeWaitForNextTask();15  await page.click('text=Playwright is a Node library');16  await page.waitForSelector('text=Playwright is a Node library');17  await makeWaitForNextTask();18  await page.click('text=Playwright is a Node library');19  await page.waitForSelector('text=Playwright is a Node library');20  await makeWaitForNextTask();21  await page.click('text=Playwright is a Node library');22  await page.waitForSelector('text=Playwright is a Node library');23});24  Error: Protocol error (Runtime.callFunctionOn): Cannot find context with specified id

Using AI Code Generation

1const { makeWaitForNextTask } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const waitForNextTask = makeWaitForNextTask();3await waitForNextTask();4const { makeWaitForNextTask } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');5const waitForNextTask = makeWaitForNextTask();6await waitForNextTask();7await page.textContent('text=Hello World');

Using AI Code Generation

1const { makeWaitForNextTask } = require('playwright/lib/utils/stackTrace');2const waitForNextTask = makeWaitForNextTask();3await waitForNextTask();4await waitForNextTask();5await waitForNextTask();6const { makeWaitForNextTask } = require('playwright/lib/utils/stackTrace');7const waitForNextTask = makeWaitForNextTask();8await waitForNextTask();9await waitForNextTask();10await waitForNextTask();11const { makeWaitForNextTask } = require('playwright/lib/utils/stackTrace');12const waitForNextTask = makeWaitForNextTask();13await waitForNextTask();14await waitForNextTask();15await waitForNextTask();16const { makeWaitForNextTask } = require('playwright/lib/utils/stackTrace');17const waitForNextTask = makeWaitForNextTask();18await waitForNextTask();19await waitForNextTask();20await waitForNextTask();21const { makeWaitForNextTask } = require('playwright/lib/utils/stackTrace');22const waitForNextTask = makeWaitForNextTask();23await waitForNextTask();24await waitForNextTask();25await waitForNextTask();26const { makeWaitForNextTask } = require('playwright/lib/utils/stackTrace');

Using AI Code Generation

1const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');2const waitForNextTask = makeWaitForNextTask();3await waitForNextTask();4const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');5const waitForNextTask = makeWaitForNextTask();6await waitForNextTask();7const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');8const waitForNextTask = makeWaitForNextTask();9await waitForNextTask();10const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');11const waitForNextTask = makeWaitForNextTask();12await waitForNextTask();13const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');14const waitForNextTask = makeWaitForNextTask();15await waitForNextTask();16const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');17const waitForNextTask = makeWaitForNextTask();18await waitForNextTask();19const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');20const waitForNextTask = makeWaitForNextTask();21await waitForNextTask();22const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');23const waitForNextTask = makeWaitForNextTask();24await waitForNextTask();25const { makeWaitForNextTask } = require('@playwright/test/lib/server/frames');26const waitForNextTask = makeWaitForNextTask();27await waitForNextTask();

Using AI Code Generation

1const { makeWaitForNextTask } = require('playwright/lib/utils/progress');2const waitForNextTask = makeWaitForNextTask();3await waitForNextTask();4await waitForNextTask();5await waitForNextTask();6await waitForNextTask();7await waitForNextTask();8const { makeWaitForNextTask } = require('playwright/lib/utils/progress');9const waitForNextTask = makeWaitForNextTask();10await waitForNextTask();11await waitForNextTask();12await waitForNextTask();13await waitForNextTask();14await waitForNextTask();15The makeWaitForNextTask() method is used to create a new instance of the waitForNextTask() method. This method is used to wait for the next task to be executed on the event loop. This method

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.