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How to use isPureComponent method in Playwright Internal

Best JavaScript code snippet using playwright-internal

index.js

1#!/usr/bin/env node2'use strict';3const program = require('commander');4const spawn = require('cross-spawn');5const chalk = require('chalk');6const path = require('path');7const fs = require('fs-extra');8const log = console.log;9program10  // å®ä¹ g å½ä»¤11  .command('g')12  // å½ä»¤ g çæè¿°13  .description('Generate a component')14  // å®ä¹ -c éé¡¹ï¼æ¥åä¸ä¸ªå¿éåæ° componentNameï¼ç»ä»¶åç§°15  .option('-c, --component-name <componentName>', 'The name of the component')16  // å®ä¹ --no-folder éé¡¹ï¼è¡¨ç¤ºå½ä½¿ç¨è¯¥éé¡¹æ¶ï¼ç»ä»¶ä¸ä¼è¢«æä»¶å¤¹åè£¹17  .option('-n, --no-folder', 'Whether the component have not it is own folder')18  // å®ä¹ -p éé¡¹ï¼è¡¨ç¤ºå½ä½¿ç¨è¯¥éé¡¹æ¶ï¼ç»ä»¶ä¸ºç»§æ¿èª React.PureComponent çç±»ç»ä»¶19  .option(20    '-p, --pure-component',21    'Whether the component is a extend from PureComponent'22  )23  // å®ä¹ -s éé¡¹ï¼è¡¨ç¤ºå½ä½¿ç¨è¯¥éé¡¹æ¶ï¼ç»ä»¶ä¸ºæ ç¶æçå½æ°ç»ä»¶24  .option(25    '-s, --stateless',26    'Whether the component is a extend from PureComponent'27  )28  // å®ä¹æ§è¡ g å½ä»¤åè°ç¨çåè°å½æ°29  .action((cmd, opt) => {30    // å½ -c éé¡¹æ²¡æä¼ åæ°è¿æ¥æ¶ï¼æ¥éãéåº31    if (!cmd.componentName) {32      log(chalk.red('error: missing required argument `componentName`'));33      process.exit(1);34    }35    const { argv } = process;36    // åå»ºç»ä»¶37    createComponent(38      argv[argv.length - 1],39      !hasFilter('-n', argv),40      hasFilter('-p', argv),41      hasFilter('-s', argv)42    );43  });44program.parse(process.argv);45// å½ä»¤è¡å¯¹å¼46function hasFilter(str, arr) {47  return arr.filter(item => { return item === str }).length48}49/**50 * åå»ºç»ä»¶51 * @param {string} componentName ç»ä»¶åç§°52 * @param {boolean} hasFolder æ¯å¦å«ææä»¶å¤¹53 * @param {boolean} isStateless æ¯å¦æ¯æ ç¶æç»ä»¶54 * @param {boolean} isPureComponent æ¯å¦æ¯çº¯ç»ä»¶55 */56function createComponent (57  componentName,58  hasFolder,59  isStateless = false,60  isPureComponent = false61) {62  let dirPath = path.join(process.cwd());63  // ç»ä»¶å¨æä»¶å¤¹ä¸64  if (hasFolder) {65    dirPath = path.join(dirPath, componentName);66    const result = fs.ensureDirSync(dirPath);67    // ç®å½å·²åå¨68    if (!result) {69      log(chalk.red(`${dirPath} already exists`));70      process.exit(1);71    }72    const indexJs = getIndexJs(componentName);73    const less = '';74    fs.writeFileSync(path.join(dirPath, `config.js`), indexJs);75    fs.writeFileSync(path.join(dirPath, `style.less`), less);76  }77  let component;78  // æ ç¶æç»ä»¶79  if (isStateless) {80    component = getStatelessComponent(componentName, hasFolder);81  } else {82    // æç¶æç»ä»¶83    component = getClassComponent(84      componentName,85      isPureComponent ? 'React.PureComponent' : 'React.Component',86      hasFolder87    );88  }89 90  fs.writeFileSync(path.join(dirPath, `${componentName}.jsx`), component);91  log(92    chalk.green(`The ${componentName} component was successfully generated!`)93  );94  process.exit(1);95}96 97/**98 * è·åç±»ç»ä»¶åç¬¦ä¸²99 * @param {string} componentName ç»ä»¶åç§°100 * @param {string} extendFrom ç»§æ¿èªï¼'React.Component' | 'React.PureComponent'101 * @param {boolean} hasFolder ç»ä»¶æ¯å¦å¨æä»¶å¤¹ä¸ï¼å¨æä»¶å¤¹ä¸çè¯ï¼å°±ä¼èªå¨å è½½ less æä»¶ï¼102 */103function getClassComponent(componentName, extendFrom, hasFolder) {104  return `import React, {Fragment} from 'react';105  import ReactDOM from 'react-dom';106  import zhCN from 'antd/lib/locale-provider/zh_CN';107  // import commerServer from './server';108  import Navbar from 'components/navbar';109  import moment from 'moment';110  import 'moment/locale/zh-cn';111  import './style.less';112  moment.locale('zh-cn');113  114  class ${componentName} extends React.${extendFrom ? 'Component' : 'PureComponent'} {115      constructor(props) {116          super(props);117          this.state = {118              loading: false119          };120      }121  122      componentDidMount() {123          this.query()124      }125      // è·åæ°æ®126      query = async ()=>{127          this.setState({loading: true })128          // const param = {  };129          // const res = await commerServer.nnn({...param});130          this.setState({131              loading: false 132          })133      }134      render() {135          let {  } = this.state;136  137          return (138              <LocaleProvider locale={zhCN}>139                  <div className='combination_list'>140                      <Navbar>ç»åéå®</Navbar>141                      <div className='border_layer'>142                      </div>143                  </div>144              </LocaleProvider>145          );146      }147  }148  149  const pageContent = document.getElementById('J_Page');150  if (pageContent) {151      ReactDOM.render(<${componentName} />, pageContent);152  }153  `;154}155 156/**157 * è·åæ ç¶æç»ä»¶åç¬¦ä¸²158 * @param {string} componentName ç»ä»¶åç§°159 * @param {boolean} hasFolder ç»ä»¶æ¯å¦å¨æä»¶å¤¹ä¸ï¼å¨æä»¶å¤¹ä¸çè¯ï¼å°±ä¼èªå¨å è½½ less æä»¶ï¼160 */161function getStatelessComponent(componentName, hasFolder) {162  return 'çç¥...';163}164 165/**166 * è·å index.js æä»¶åå®¹167 * @param {string} componentName ç»ä»¶åç§°168 */169function getIndexJs(componentName) {170  return `import ${componentName} from './${componentName}';171export default ${componentName};172`;...

instance-method.test.js

Source: instance-method.test.js

1/* eslint-env jest */2import React from 'react';3import { createMounter, ensureNoWarnings } from './helper';4import createProxy from '../../src/proxy';5const createFixtures = () => ({6  modern: {7    shouldWarnOnBind: false,8    Counter1x: class Counter1x extends React.Component {9      constructor(props) {10        super(props);11        this.state = { counter: 0 };12      }13      increment() {14        this.setState({15          counter: this.state.counter + 1,16        });17      }18      render() {19        return <span>{this.state.counter}</span>;20      }21    },22    Counter10x: class Counter10x extends React.Component {23      constructor(props) {24        super(props);25        this.state = { counter: 0 };26      }27      increment() {28        this.setState({29          counter: this.state.counter + 10,30        });31      }32      render() {33        return <span>{this.state.counter}</span>;34      }35    },36    Counter100x: class Counter100x extends React.Component {37      constructor(props) {38        super(props);39        this.state = { counter: 0 };40      }41      increment() {42        this.setState({43          counter: this.state.counter + 100,44        });45      }46      render() {47        return <span>{this.state.counter}</span>;48      }49    },50    CounterWithoutIncrementMethod: class CounterWithoutIncrementMethod extends React.Component {51      constructor(props) {52        super(props);53        this.state = { counter: 0 };54      }55      render() {56        return <span>{this.state.counter}</span>;57      }58    },59    NotPureComponent: class NotPureComponent extends React.Component {60      shouldComponentUpdate() {61        return true;62      }63      render() {64        return <span>Component</span>;65      }66    },67    IsPureComponent: class IsPureComponent extends React.PureComponent {68      render() {69        return <span>PureComponent</span>;70      }71    },72  },73});74describe('instance method', () => {75  const { getWarnSpy } = ensureNoWarnings();76  const { mount } = createMounter();77  Object.keys(createFixtures()).forEach(type => {78    describe(type, () => {79      it('gets added', () => {80        const { Counter1x, CounterWithoutIncrementMethod } = createFixtures()[type];81        const proxy = createProxy(CounterWithoutIncrementMethod);82        const Proxy = proxy.get();83        const wrapper = mount(<Proxy />);84        expect(wrapper.text()).toEqual('0');85        proxy.update(Counter1x);86        wrapper.instance().increment();87        expect(wrapper.text()).toEqual('1');88      });89      it('gets replaced', () => {90        const { Counter1x, Counter10x, Counter100x } = createFixtures()[type];91        const proxy = createProxy(Counter1x);92        const Proxy = proxy.get();93        const wrapper = mount(<Proxy />);94        expect(wrapper.text()).toEqual('0');95        wrapper.instance().increment();96        expect(wrapper.text()).toEqual('1');97        proxy.update(Counter10x);98        wrapper.instance().increment();99        mount(<Proxy />);100        expect(wrapper.text()).toEqual('11');101        proxy.update(Counter100x);102        wrapper.instance().increment();103        mount(<Proxy />);104        expect(wrapper.text()).toEqual('111');105      });106      it('removes shouldComponentUpdate', () => {107        const { IsPureComponent, NotPureComponent } = createFixtures()[type];108        const proxy = createProxy(NotPureComponent);109        const Proxy = proxy.get();110        const wrapper = mount(<Proxy />);111        expect(wrapper.text()).toEqual('Component');112        expect(wrapper.instance()).toHaveProperty('shouldComponentUpdate');113        proxy.update(IsPureComponent);114        wrapper.instance().forceUpdate();115        mount(<Proxy />);116        expect(wrapper.text()).toEqual('PureComponent');117        expect(wrapper.instance()).not.toHaveProperty('shouldComponentUpdate');118      });119      it('cant handle bound methods', () => {120        const { Counter1x, Counter10x, shouldWarnOnBind } = createFixtures()[type];121        const proxy = createProxy(Counter1x);122        const Proxy = proxy.get();123        const wrapper = mount(<Proxy />);124        const instance = wrapper.instance();125        getWarnSpy().mockReset();126        const localWarnSpy = jest.spyOn(console, 'warn');127        instance.increment = instance.increment.bind(instance);128        expect(localWarnSpy).toHaveBeenCalledTimes(shouldWarnOnBind ? 1 : 0);129        expect(wrapper.text()).toEqual('0');130        instance.increment();131        expect(wrapper.text()).toEqual('1');132        proxy.update(Counter10x);133        instance.increment();134        mount(<Proxy />);135        expect(wrapper.text()).toEqual('2'); // not 11136      });137    });138  });139  it('passes methods props thought', () => {140    const injectedMethod = (a, b) => this[24 + a + b];141    injectedMethod.staticProp = 'magic';142    class App extends React.Component {143      method() {144        return 42;145      }146    }147    App.prototype.injectedMethod = injectedMethod;148    const app1 = new App();149    expect(app1.injectedMethod).toBe(injectedMethod);150    expect(app1.injectedMethod.staticProp).toBe('magic');151    expect(String(app1.injectedMethod)).toBe(String(injectedMethod));152    const Proxy = createProxy(App).get();153    const app2 = new Proxy();154    expect(app2.injectedMethod).not.toBe(injectedMethod);155    expect(app2.injectedMethod.staticProp).toBe('magic');156    expect(app2.injectedMethod.length).toBe(2);157    expect(String(app2.injectedMethod)).toBe(String(injectedMethod));158  });...

RenderTest.js

Source: RenderTest.js

...37    }38    console.groupEnd();39  }40}41function isPureComponent(WrappedComponent) {42  return !!(WrappedComponent.prototype && WrappedComponent.prototype.isPureReactComponent);43}44const RerenderTest = (WrappedComponent, { verbose }) => {45  const Parent = isPureComponent(WrappedComponent) ? PureComponent : Component;46  return class Container extends Parent {47    componentDidUpdate(prevProps, prevState) {48      deepDiff(49          { props: prevProps, state: prevState },50          { props: this.props, state: this.state },51          WrappedComponent.name, verbose52        );53    }54    render() {55      return <WrappedComponent {...this.props} />;56    }57  };58}59export default RerenderTest;

PureComponentExp.js

Source: PureComponentExp.js

1import React, { Component, PureComponent, useState } from 'react';2class IsPureComponent extends PureComponent {3	render() {4		return (5			<div>6				<div>-----</div>7				<div>PureComponent render: {this.props.state}</div>8				<div>Render be Called: {Math.random()}</div>9			</div>10		);11	}12}13class NonComponent extends Component {14	render() {15		return (16			<div>17				<div>-----</div>18				<div>Non PureComponent render: {this.props.state}</div>19				<div>Render be Called: {Math.random()}</div>20			</div>21		);22	}23}24const Wrapper = () => {25	const [state, setState] = useState(0);26	const [value, setValue] = useState(0);27	return <div>28		<div>click the followig buttons will change Component1 and Component2 props</div>29		<button onClick={() => setValue(Math.random())}>click to change state but not pass props (Component will be rendered, but not pure component)</button>30		<button onClick={() => setState(Math.random())}>click to change state and pass props to two components</button>31		<div>Current passed props value = {state}</div>32		<div>Current NOT passed props value = {value}</div>33		<IsPureComponent state={state}/>34		<NonComponent state={state}/>35	</div>36}...

isPureComponent.spec.js

Source: isPureComponent.spec.js

2import React from 'react'3import isPureComponent from '../src/isPureComponent'4test('Simple function - pure', function () {5  const Comp = function (props) { return <div /> }6  expect(isPureComponent(Comp)).toBeTruthy()7})8test('Arrow function - pure', function () {9  const Comp = (props) => { return <div /> }10  expect(isPureComponent(Comp)).toBeTruthy()11})12test('Subclass of React.PureComponent - pure', function () {13  class Comp extends React.PureComponent {14    render () {15      return <div />16    }17  }18  expect(isPureComponent(Comp)).toBeTruthy()19})20test('Subclass of React.Component - not pure', function () {21  class Comp extends React.Component {22    render () {23      return <div />24    }25  }26  expect(isPureComponent(Comp)).toBeFalsy()27})28test('Host component - not pure', function () {29  expect(isPureComponent('div')).toBeFalsy()...

PureComponent.js

Source: PureComponent.js

1import Component from './Component';2import { shallowEqual } from './shared';3class PureComponent extends Component {4  isPureComponent = true;5  shouldComponentUpdate (nextProps, nextState) {6    return !shallowEqual(this.props, nextProps) || !shallowEqual(this.state, nextState);7  }8}...

pure-component.js

Source: pure-component.js

1import Component from './component'2import shallowEqual from './shallow-equal'3class PureComponent extends Component {4  isPureComponent = true5  shouldComponentUpdate (nextProps, nextState) {6    return !shallowEqual(this.props, nextProps) || !shallowEqual(this.state, nextState)7  }8}...

isPureComponent.js

Source: isPureComponent.js

1function isPureComponent (comp) {2  if (typeof comp === 'string') {3    return false4  }5  const p = comp.prototype6  return p.isPureReactComponent || !p.setState7}...

Using AI Code Generation

1const { isPureComponent } = require('playwright/lib/server/frames');2const { Page } = require('playwright/lib/server/page');3const { Frame } = require('playwright/lib/server/frame');4const { ElementHandle } = require('playwright/lib/server/dom');5const { isPureComponent } = require('playwright/lib/server/frames');6const { Page } = require('playwright/lib/server/page');7const { Frame } = require('playwright/lib/server/frame');8const { ElementHandle } = require('playwright/lib/server/dom');9const { isPureComponent } = require('playwright/lib/server/frames');10const { Page } = require('playwright/lib/server/page');11const { Frame } = require('playwright/lib/server/frame');12const { ElementHandle } = require('playwright/lib/server/dom');13const { isPureComponent } = require('playwright/lib/server/frames');14const { Page } = require('playwright/lib/server/page');15const { Frame } = require('playwright/lib/server/frame');16const { ElementHandle } = require('playwright/lib/server/dom');17const { isPureComponent } = require('playwright/lib/server/frames');18const { Page } = require('playwright/lib/server/page');19const { Frame } = require('playwright/lib/server/frame');20const { ElementHandle } = require('playwright/lib/server/dom');21const { isPureComponent } = require('playwright/lib/server/frames');22const { Page } = require('playwright/lib/server/page');23const { Frame } = require('playwright/lib/server/frame');24const { ElementHandle } = require('playwright/lib/server/dom');25const { isPureComponent } = require('playwright/lib/server/frames');26const { Page } = require('playwright/lib/server/page');27const { Frame } = require('playwright/lib/server/frame');28const { ElementHandle } = require('playwright/lib/server/dom');29const { isPureComponent } =

Using AI Code Generation

1const { isPureComponent } = require('playwright/lib/server/supplements/recorder/recorderSupplement');2const { Page } = require('playwright');3const { chromium } = require('playwright');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  const pure = await isPureComponent(page, 'div');9  console.log(pure);10  await browser.close();11})();

Using AI Code Generation

1const { isPureComponent } = require('@playwright/test/lib/utils');2const { Page } = require('@playwright/test/lib/page');3const { expect } = require('@playwright/test');4describe('test', () => {5  it('test', async () => {6    const page = new Page();7    const isPureComponentResult = isPureComponent(page);8    expect(isPureComponentResult).toBe(false);9  });10});

Using AI Code Generation

1const { isPureComponent } = require('playwright/lib/server/frames');2const { parseSelector } = require('playwright/lib/server/common/selectors');3const { parseSelectorV2 } = require('playwright/lib/server/common/selectors2');4const selector = parseSelector('text=foo', 'css');5const selectorV2 = parseSelectorV2('text=foo', 'css');6console.log(isPureComponent(selector));7console.log(isPureComponent(selectorV2));8const selectorEngine = await page.selectorEngine();9console.log(selectorEngine.isPureComponent(selector));10const selectorEngine = await page.selectorEngine();11console.log(selectorEngine.isPureComponent(selector));

Using AI Code Generation

1const { isPureComponent } = require('playwright/lib/server/domPatchers/PureComponent');2const { parseScript } = require('playwright/lib/server/common/utils');3const { parse } = require('playwright/lib/server/common/inspectorUtils');4const { parseExpression } = require('playwright/lib/server/common/utils');5const code = "const MyComponent = (props) => { return <div>{props.name}</div> }";6const script = parseScript(code);7const node = script.body[0].declarations[0].init;8const isPure = isPureComponent(node);9console.log(isPure);10{11  "dependencies": {12  }13}14[Apache 2.0](LICENSE)

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

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

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

firefox browser does not start in playwright

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

I played with your example for a while and I got the same errors. These are the things I found that made my example work:

It must be Linux. I know that you mentioned that you picked a Linux plan. But I found that in VS Code that part is hidden, and on the Web the default is Windows. This is important because only the Linux plan runs npm install on the server.

Make sure that you are building on the server. You can find this option in the VS Code Settings:

Make sure you set the environment variable PLAYWRIGHT_BROWSERS_PATH, before making the publish.

https://stackoverflow.com/questions/63949978/running-playwright-in-azure-function

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

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

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

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

Blogs

Check out the latest blogs from LambdaTest on this topic:

Unveiling Samsung Galaxy Z Fold4 For Mobile App Testing

Hey LambdaTesters! We’ve got something special for you this week. ????

How To Run Cypress Tests In Azure DevOps Pipeline

When software developers took years to create and introduce new products to the market is long gone. Users (or consumers) today are more eager to use their favorite applications with the latest bells and whistles. However, users today don’t have the patience to work around bugs, errors, and design flaws. People have less self-control, and if your product or application doesn’t make life easier for users, they’ll leave for a better solution.

Fluent Interface Design Pattern in Automation Testing

Recently, I was going through some of the design patterns in Java by reading the book Head First Design Patterns by Eric Freeman, Elisabeth Robson, Bert Bates, and Kathy Sierra.

How To Handle Dynamic Dropdowns In Selenium WebDriver With Java

Joseph, who has been working as a Quality Engineer, was assigned to perform web automation for the company’s website.

Continuous Integration explained with jenkins deployment

Continuous integration is a coding philosophy and set of practices that encourage development teams to make small code changes and check them into a version control repository regularly. Most modern applications necessitate the development of code across multiple platforms and tools, so teams require a consistent mechanism for integrating and validating changes. Continuous integration creates an automated way for developers to build, package, and test their applications. A consistent integration process encourages developers to commit code changes more frequently, resulting in improved collaboration and code quality.

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.