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How to use ReactDefaultBatchingStrategyTransaction method in Playwright Internal

Best JavaScript code snippet using playwright-internal

module$ReactDefaultBatchingStrategy.js

Source: module$ReactDefaultBatchingStrategy.js

1goog.provide("module$ReactDefaultBatchingStrategy");2var module$ReactDefaultBatchingStrategy = {};3goog.require("module$mixInto");4goog.require("module$emptyFunction");5goog.require("module$Transaction");6goog.require("module$ReactUpdates");7var ReactUpdates$$module$ReactDefaultBatchingStrategy = module$ReactUpdates;8var Transaction$$module$ReactDefaultBatchingStrategy = module$Transaction;9var emptyFunction$$module$ReactDefaultBatchingStrategy = module$emptyFunction;10var mixInto$$module$ReactDefaultBatchingStrategy = module$mixInto;11var RESET_BATCHED_UPDATES$$module$ReactDefaultBatchingStrategy = {initialize:emptyFunction$$module$ReactDefaultBatchingStrategy, close:function() {12  ReactDefaultBatchingStrategy$$module$ReactDefaultBatchingStrategy.isBatchingUpdates = false13}};14var FLUSH_BATCHED_UPDATES$$module$ReactDefaultBatchingStrategy = {initialize:emptyFunction$$module$ReactDefaultBatchingStrategy, close:ReactUpdates$$module$ReactDefaultBatchingStrategy.flushBatchedUpdates.bind(ReactUpdates$$module$ReactDefaultBatchingStrategy)};15var TRANSACTION_WRAPPERS$$module$ReactDefaultBatchingStrategy = [FLUSH_BATCHED_UPDATES$$module$ReactDefaultBatchingStrategy, RESET_BATCHED_UPDATES$$module$ReactDefaultBatchingStrategy];16function ReactDefaultBatchingStrategyTransaction$$module$ReactDefaultBatchingStrategy() {17  this.reinitializeTransaction()18}19mixInto$$module$ReactDefaultBatchingStrategy(ReactDefaultBatchingStrategyTransaction$$module$ReactDefaultBatchingStrategy, Transaction$$module$ReactDefaultBatchingStrategy.Mixin);20mixInto$$module$ReactDefaultBatchingStrategy(ReactDefaultBatchingStrategyTransaction$$module$ReactDefaultBatchingStrategy, {getTransactionWrappers:function() {21  return TRANSACTION_WRAPPERS$$module$ReactDefaultBatchingStrategy22}});23var transaction$$module$ReactDefaultBatchingStrategy = new ReactDefaultBatchingStrategyTransaction$$module$ReactDefaultBatchingStrategy;24var ReactDefaultBatchingStrategy$$module$ReactDefaultBatchingStrategy = {isBatchingUpdates:false, batchedUpdates:function(callback, param) {25  var alreadyBatchingUpdates = ReactDefaultBatchingStrategy$$module$ReactDefaultBatchingStrategy.isBatchingUpdates;26  ReactDefaultBatchingStrategy$$module$ReactDefaultBatchingStrategy.isBatchingUpdates = true;27  if(alreadyBatchingUpdates) {28    callback(param)29  }else {30    transaction$$module$ReactDefaultBatchingStrategy.perform(callback, null, param)31  }32}};33module$ReactDefaultBatchingStrategy.module$exports = ReactDefaultBatchingStrategy$$module$ReactDefaultBatchingStrategy;34if(module$ReactDefaultBatchingStrategy.module$exports) {35  module$ReactDefaultBatchingStrategy = module$ReactDefaultBatchingStrategy.module$exports36}...

ReactDefaultBatchingStrategy.js

Source: ReactDefaultBatchingStrategy.js

...30  initialize: emptyFunction,31  close: ReactUpdates.flushBatchedUpdates.bind(ReactUpdates)32};33var TRANSACTION_WRAPPERS = [FLUSH_BATCHED_UPDATES, RESET_BATCHED_UPDATES];34function ReactDefaultBatchingStrategyTransaction() {35  this.reinitializeTransaction();36}37mixInto(ReactDefaultBatchingStrategyTransaction, Transaction.Mixin);38mixInto(ReactDefaultBatchingStrategyTransaction, {39  getTransactionWrappers: function() {40    return TRANSACTION_WRAPPERS;41  }42});43var transaction = new ReactDefaultBatchingStrategyTransaction();44var ReactDefaultBatchingStrategy = {45  isBatchingUpdates: false,46  /**47   * Call the provided function in a context within which calls to `setState`48   * and friends are batched such that components aren't updated unnecessarily.49   */50  batchedUpdates: function(callback, param) {51    var alreadyBatchingUpdates = ReactDefaultBatchingStrategy.isBatchingUpdates;52    ReactDefaultBatchingStrategy.isBatchingUpdates = true;53    // The code is written this way to avoid extra allocations54    if (alreadyBatchingUpdates) {55      callback(param);56    } else {57      transaction.perform(callback, null, param);...

86fb5eReactDefaultBatchingStrategy.js

Source: 86fb5eReactDefaultBatchingStrategy.js

...12  initialize: emptyFunction,13  close: ReactUpdates.flushBatchedUpdates.bind(ReactUpdates)14};15var TRANSACTION_WRAPPERS = [FLUSH_BATCHED_UPDATES, RESET_BATCHED_UPDATES];16function ReactDefaultBatchingStrategyTransaction() {17  this.reinitializeTransaction();18}19babelHelpers.extends(ReactDefaultBatchingStrategyTransaction.prototype, Transaction, {20  getTransactionWrappers: function getTransactionWrappers() {21    return TRANSACTION_WRAPPERS;22  }23});24var transaction = new ReactDefaultBatchingStrategyTransaction();25var ReactDefaultBatchingStrategy = {26  isBatchingUpdates: false,27  batchedUpdates: function batchedUpdates(callback, a, b, c, d, e) {28    var alreadyBatchingUpdates = ReactDefaultBatchingStrategy.isBatchingUpdates;29    ReactDefaultBatchingStrategy.isBatchingUpdates = true;30    if (alreadyBatchingUpdates) {31      return callback(a, b, c, d, e);32    } else {33      return transaction.perform(callback, null, a, b, c, d, e);34    }35  }36};...

a0c875ReactDefaultBatchingStrategy.js

Source: a0c875ReactDefaultBatchingStrategy.js

...10var FLUSH_BATCHED_UPDATES={11initialize:emptyFunction,12close:ReactUpdates.flushBatchedUpdates.bind(ReactUpdates)};13var TRANSACTION_WRAPPERS=[FLUSH_BATCHED_UPDATES,RESET_BATCHED_UPDATES];14function ReactDefaultBatchingStrategyTransaction(){15this.reinitializeTransaction();16}17babelHelpers.extends(18ReactDefaultBatchingStrategyTransaction.prototype,19Transaction,20{21getTransactionWrappers:function getTransactionWrappers(){22return TRANSACTION_WRAPPERS;23}});24var transaction=new ReactDefaultBatchingStrategyTransaction();25var ReactDefaultBatchingStrategy={26isBatchingUpdates:false,27batchedUpdates:function batchedUpdates(callback,a,b,c,d,e){28var alreadyBatchingUpdates=ReactDefaultBatchingStrategy.isBatchingUpdates;29ReactDefaultBatchingStrategy.isBatchingUpdates=true;30if(alreadyBatchingUpdates){31return callback(a,b,c,d,e);32}else{33return transaction.perform(callback,null,a,b,c,d,e);34}35}};...

748c6dReactDefaultBatchingStrategy.js

Source: 748c6dReactDefaultBatchingStrategy.js

...10var FLUSH_BATCHED_UPDATES={11initialize:emptyFunction,12close:ReactUpdates.flushBatchedUpdates.bind(ReactUpdates)};13var TRANSACTION_WRAPPERS=[FLUSH_BATCHED_UPDATES,RESET_BATCHED_UPDATES];14function ReactDefaultBatchingStrategyTransaction(){15this.reinitializeTransaction();16}17babelHelpers.extends(18ReactDefaultBatchingStrategyTransaction.prototype,19Transaction,20{21getTransactionWrappers:function getTransactionWrappers(){22return TRANSACTION_WRAPPERS;23}});24var transaction=new ReactDefaultBatchingStrategyTransaction();25var ReactDefaultBatchingStrategy={26isBatchingUpdates:false,27batchedUpdates:function batchedUpdates(callback,a,b,c,d,e){28var alreadyBatchingUpdates=ReactDefaultBatchingStrategy.isBatchingUpdates;29ReactDefaultBatchingStrategy.isBatchingUpdates=true;30if(alreadyBatchingUpdates){31return callback(a,b,c,d,e);32}else{33return transaction.perform(callback,null,a,b,c,d,e);34}35}};...

8a3083ReactDefaultBatchingStrategy.js

Source: 8a3083ReactDefaultBatchingStrategy.js

...10var FLUSH_BATCHED_UPDATES={11initialize:emptyFunction,12close:ReactUpdates.flushBatchedUpdates.bind(ReactUpdates)};13var TRANSACTION_WRAPPERS=[FLUSH_BATCHED_UPDATES,RESET_BATCHED_UPDATES];14function ReactDefaultBatchingStrategyTransaction(){15this.reinitializeTransaction();16}17babelHelpers.extends(18ReactDefaultBatchingStrategyTransaction.prototype,19Transaction,20{21getTransactionWrappers:function getTransactionWrappers(){22return TRANSACTION_WRAPPERS;23}});24var transaction=new ReactDefaultBatchingStrategyTransaction();25var ReactDefaultBatchingStrategy={26isBatchingUpdates:false,27batchedUpdates:function batchedUpdates(callback,a,b,c,d,e){28var alreadyBatchingUpdates=ReactDefaultBatchingStrategy.isBatchingUpdates;29ReactDefaultBatchingStrategy.isBatchingUpdates=true;30if(alreadyBatchingUpdates){31return callback(a,b,c,d,e);32}else{33return transaction.perform(callback,null,a,b,c,d,e);34}35}};...

transaction.js

Source: transaction.js

...16    initialize: emptyFunction,17    close: ReactUpdates.flushBatchedUpdates.bind(ReactUpdates),18};19var TRANSACTION_WRAPPERS = [FLUSH_BATCHED_UPDATES, RESET_BATCHED_UPDATES];20function ReactDefaultBatchingStrategyTransaction() {21    this.reinitializeTransaction();22}23Object.assign(ReactDefaultBatchingStrategyTransaction.prototype, Transaction, {24    getTransactionWrappers: function() {25        return TRANSACTION_WRAPPERS;26    },27});28var transaction = new ReactDefaultBatchingStrategyTransaction();...

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  for (const browserType of BROWSER) {4    const browser = await playwright[browserType].launch();5    const context = await browser.newContext();6    const page = await context.newPage();7    await page.click('text=Sign in');8    await page.fill('input[name="identifier"]', 'test');9    await page.click('text=Next');10    await page.fill('input[name="password"]', 'test');11    await page.click('text=Next');

Using AI Code Generation

1const playwright = require('playwright');2const fs = require('fs');3(async () => {4  for (const browserType of BROWSER) {5    const browser = await playwright[browserType].launch();6    const context = await browser.newContext();7    const page = await context.newPage();

Using AI Code Generation

1const playwright = require('playwright');2const { ReactDefaultBatchingStrategyTransaction } = playwright.internal;3const { chromium } = playwright;4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.evaluate(ReactDefaultBatchingStrategyTransaction);9  await page.close();10  await context.close();11  await browser.close();12})();

Using AI Code Generation

1const { Playwright } = require('playwright');2const { ReactDefaultBatchingStrategyTransaction } = Playwright.Internal;3(async () => {4  const browser = await Playwright.chromium.launch();5  const page = await browser.newPage();6  const transaction = new ReactDefaultBatchingStrategyTransaction(page);7  transaction.start();8  await page.click('text=Google Search');9  await page.fill('input[name="q"]', 'Playwright');10  transaction.end();11  await page.close();12  await browser.close();13})();14import { test, expect } from '@playwright/test';15import { Playwright } from 'playwright';16const { ReactDefaultBatchingStrategyTransaction } = Playwright.Internal;17test.describe('ReactDefaultBatchingStrategyTransaction', () => {18  test('should work', async ({ page }) => {19    const transaction = new ReactDefaultBatchingStrategyTransaction(page);20    transaction.start();21    await page.click('text=Google Search');22    await page.fill('input[name="q"]', 'Playwright');23    transaction.end();24    await page.close();25    await browser.close();26  });27});28import { test, expect } from '@playwright/test';29import { Playwright } from 'playwright';30const { ReactDefaultBatchingStrategyTransaction } = Playwright.Internal;31test.describe('ReactDefaultBatchingStrategyTransaction', () => {32  test('should work', async ({ page }) => {33    const transaction = new ReactDefaultBatchingStrategyTransaction(page);34    transaction.start();35    await page.click('text=Google Search');36    await page.fill('input[name="q"]', 'Playwright');37    transaction.end();38    await page.close();39    await browser.close();40  });41});

Using AI Code Generation

1const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/supplements/react/reactDefaultBatchingStrategyTransaction');2const { ReactDefaultBatchingStrategy } = require('@playwright/test/lib/server/supplements/react/reactDefaultBatchingStrategy');3const { ReactDefaultBatchingStrategyTransactionImpl } = require('@playwright/test/lib/server/supplements/react/reactDefaultBatchingStrategyTransactionImpl');4const reactDefaultBatchingStrategyTransaction = new ReactDefaultBatchingStrategyTransactionImpl();5const reactDefaultBatchingStrategy = new ReactDefaultBatchingStrategy();6const transaction = new ReactDefaultBatchingStrategyTransaction(reactDefaultBatchingStrategyTransaction, reactDefaultBatchingStrategy);7transaction.perform(() => {8  console.log('hello world');9});10transaction.perform(() => {11  console.log('hello world');12});13transaction.perform(() => {14  console.log('hello world');15});16transaction.perform(() => {17  console.log('hello world');18});19transaction.perform(() => {20  console.log('hello world');21});22transaction.perform(() => {23  console.log('hello world');24});25transaction.perform(() => {

Using AI Code Generation

1const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');2const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');3const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');4const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');5const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');6const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');7const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');8const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');9const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');10const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');11const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');12const { ReactDefaultBatchingStrategyTransaction } = require('@playwright/test/lib/server/trace/viewer/traceModel');

Using AI Code Generation

1const {chromium} = require('playwright');2const {ReactDefaultBatchingStrategyTransaction} = require('playwright/lib/server/trace/model/transactions');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.fill('input[name="q"]', 'Hello World!');8  await page.click('input[type="submit"]');9  await page.screenshot({ path: `example.png` });10  await browser.close();11})();12const {chromium} = require('playwright');13const {ReactDefaultBatchingStrategyTransaction} = require('playwright/lib/server/trace/model/transactions');14(async () => {15  const browser = await chromium.launch();16  const context = await browser.newContext();17  const page = await context.newPage();18  await page.fill('input[name="q"]', 'Hello World!');19  await page.click('input[type="submit"]');20  await page.screenshot({ path: `example.png` });21  await browser.close();22})();23const {chromium} = require('playwright');24const {ReactDefaultBatchingStrategyTransaction} = require('playwright/lib/server/trace/model/transactions');25(async () => {26  const browser = await chromium.launch();27  const context = await browser.newContext();28  const page = await context.newPage();29  await page.fill('input[name="q"]', 'Hello World!');30  await page.click('input[type="submit"]');31  await page.screenshot({ path: `example.png` });32  await browser.close();33})();34const {chromium} = require('playwright');35const {ReactDefaultBatchingStrategyTransaction} = require('playwright/lib/server/trace/model/transactions');36(async () => {37  const browser = await chromium.launch();38  const context = await browser.newContext();39  const page = await context.newPage();40  await page.fill('input[name="q"]', 'Hello World!');41  await page.click('input[type

Using AI Code Generation

1const { ReactDefaultBatchingStrategyTransaction, ReactDefaultBatchingStrategy } = require('playwright/lib/client/react');2const { Page } = require('playwright/lib/client/page');3const { ElementHandle } = require('playwright/lib/client/elementHandle');4Page.prototype._doReactWork = async function (work) {5  const transaction = new ReactDefaultBatchingStrategyTransaction();6  transaction.perform(work);7};8ElementHandle.prototype.react = async function () {9  return await this.evaluateHandle((element, React) => {10    const key = Object.keys(element).find(key => key.startsWith('__reactInternalInstance$'));11    const fiberNode = element[key];12    if (fiberNode) {13        : ReactDefaultBatchingStrategy.batchedUpdates(() => fiberNode);14    }15  }, ReactDefaultBatchingStrategy);16};17(async () => {18  const browser = await playwright.chromium.launch();19  const page = await browser.newPage();20  await page._doReactWork(async () => {21    const input = await page.$('input[name="q"]');22    const react = await input.react();23    console.log(react);24  });25  await browser.close();26})();27{ tag: 5,28  stateNode: { value: '' },29   { tag: 2,30     stateNode: { _reactName: 'Form', _reactInternalFiber: [Circular] },31     alternate: null },32   { tag: 3,33     stateNode: { _reactName: '

Using AI Code Generation

1const playwright = require('playwright');2const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;3const playwright = require('playwright');4const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;5const playwright = require('playwright');6const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;7const playwright = require('playwright');8const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;9const playwright = require('playwright');10const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;11const playwright = require('playwright');12const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;13const playwright = require('playwright');14const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;15const playwright = require('playwright');16const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;17const playwright = require('playwright');18const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;19const playwright = require('playwright');20const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;21const playwright = require('playwright');22const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;23const playwright = require('playwright');24const ReactDefaultBatchingStrategyTransaction = playwright.internal.ReactDefaultBatchingStrategyTransaction;25const playwright = require('

StackOverFlow community discussions

Questions

Discussion

Is it possible to get the selector from a locator object in playwright?

firefox browser does not start in playwright

How to run a list of test suites in a single file concurrently in jest?

firefox browser does not start in playwright

Jest + Playwright - Test callbacks of event-based DOM library

Running Playwright in Azure Function

Well this is one way, but not sure if it will work for all possible locators!.

// Get a selector from a playwright locator
import { Locator } from "@playwright/test";
export function extractSelector(locator: Locator) {
    const selector = locator.toString();
    const parts = selector.split("@");
    if (parts.length !== 2) { throw Error("extractSelector: susupect that this is not a locator"); }
    if (parts[0] !== "Locator") { throw Error("extractSelector: did not find locator"); }
    return parts[1];
}

https://stackoverflow.com/questions/72044959/is-it-possible-to-get-the-selector-from-a-locator-object-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

This question is quite close to a "need more focus" question. But let's try to give it some focus:

Does Playwright has access to the cPicker object on the page? Does it has access to the window object?

Yes, you can access both cPicker and the window object inside an evaluate call.

Should I trigger the events from the HTML file itself, and in the callbacks, print in the DOM the result, in some dummy-element, and then infer from that dummy element text that the callbacks fired?

Exactly, or you can assign values to a javascript variable:

const cPicker = new ColorPicker({
  onClickOutside(e){
  },
  onInput(color){
    window['color'] = color;
  },
  onChange(color){
    window['result'] = color;
  }
})

And then

it('Should call all callbacks with correct arguments', async() => {
    await page.goto(`http://localhost:5000/tests/visual/basic.html`, {waitUntil:'load'})

    // Wait until the next frame
    await page.evaluate(() => new Promise(requestAnimationFrame))

    // Act
   
    // Assert
    const result = await page.evaluate(() => window['color']);
    // Check the value
})

https://stackoverflow.com/questions/65477895/jest-playwright-test-callbacks-of-event-based-dom-library

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Software testing is fueling the IT sector forward by scaling up the test process and continuous product delivery. Currently, this profession is in huge demand, as it needs certified testers with expertise in automation testing. When it comes to outsourcing software testing jobs, whether it’s an IT company or an individual customer, they all look for accredited professionals. That’s why having an software testing certification has become the need of the hour for the folks interested in the test automation field. A well-known certificate issued by an authorized institute kind vouches that the certificate holder is skilled in a specific technology.

How To Write End-To-End Tests Using Cypress App Actions

When I started writing tests with Cypress, I was always going to use the user interface to interact and change the application’s state when running tests.

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.