KaneAI - World’s First E2E Software Testing Agent.Book a Demo 
How to use callComponentWillMount method in Playwright Internal
Best JavaScript code snippet using playwright-internal
ReactFiberClassComponent.js
Source:ReactFiberClassComponent.js 
...87 workInProgress.stateNode = instance;88 // The instance needs access to the fiber so that it can schedule updates89 ReactInstanceMap.set(instance, workInProgress);90 }91 function callComponentWillMount(workInProgress, instance) {92 const oldState = instance.state;93 instance.componentWillMount();94 if (oldState !== instance.state) {95 updater.enqueueReplaceState(instance, instance.state, null);96 }97 }98 function callComponentWillReceiveProps(workInProgress, instance, newProps, newContext) {99 const oldState = instance.state;100 instance.componentWillReceiveProps(newProps, newContext);101 if (instance.state !== oldState) {102 updater.enqueueReplaceState(instance, instance.state, null);103 }104 }105 // Invokes the mount life-cycles on a previously never rendered instance.106 // Called on a preexisting class instance. Returns false if a resumed render107 // could be reused.108 // function resumeMountClassInstance(109 // workInProgress: Fiber,110 // priorityLevel: PriorityLevel,111 // ): boolean {112 // const instance = workInProgress.stateNode;113 // resetInputPointers(workInProgress, instance);114 // let newState = workInProgress.memoizedState;115 // let newProps = workInProgress.pendingProps;116 // if (!newProps) {117 // // If there isn't any new props, then we'll reuse the memoized props.118 // // This could be from already completed work.119 // newProps = workInProgress.memoizedProps;120 // invariant(121 // newProps != null,122 // 'There should always be pending or memoized props. This error is ' +123 // 'likely caused by a bug in React. Please file an issue.',124 // );125 // }126 // const newUnmaskedContext = getUnmaskedContext(workInProgress);127 // const newContext = getMaskedContext(workInProgress, newUnmaskedContext);128 // const oldContext = instance.context;129 // const oldProps = workInProgress.memoizedProps;130 // if (131 // typeof instance.componentWillReceiveProps === 'function' &&132 // (oldProps !== newProps || oldContext !== newContext)133 // ) {134 // callComponentWillReceiveProps(135 // workInProgress,136 // instance,137 // newProps,138 // newContext,139 // );140 // }141 // // Process the update queue before calling shouldComponentUpdate142 // const updateQueue = workInProgress.updateQueue;143 // if (updateQueue !== null) {144 // newState = beginUpdateQueue(145 // workInProgress,146 // updateQueue,147 // instance,148 // newState,149 // newProps,150 // priorityLevel,151 // );152 // }153 // // TODO: Should we deal with a setState that happened after the last154 // // componentWillMount and before this componentWillMount? Probably155 // // unsupported anyway.156 // if (157 // !checkShouldComponentUpdate(158 // workInProgress,159 // workInProgress.memoizedProps,160 // newProps,161 // workInProgress.memoizedState,162 // newState,163 // newContext,164 // )165 // ) {166 // // Update the existing instance's state, props, and context pointers even167 // // though we're bailing out.168 // instance.props = newProps;169 // instance.state = newState;170 // instance.context = newContext;171 // return false;172 // }173 // // Update the input pointers now so that they are correct when we call174 // // componentWillMount175 // instance.props = newProps;176 // instance.state = newState;177 // instance.context = newContext;178 // if (typeof instance.componentWillMount === 'function') {179 // callComponentWillMount(workInProgress, instance);180 // // componentWillMount may have called setState. Process the update queue.181 // const newUpdateQueue = workInProgress.updateQueue;182 // if (newUpdateQueue !== null) {183 // newState = beginUpdateQueue(184 // workInProgress,185 // newUpdateQueue,186 // instance,187 // newState,188 // newProps,189 // priorityLevel,190 // );191 // }192 // }193 // if (typeof instance.componentDidMount === 'function') {194 // workInProgress.effectTag |= Update;195 // }196 // instance.state = newState;197 // return true;198 // }199 // Invokes the update life-cycles and returns false if it shouldn't rerender.200 return {201 adoptClassInstance,202 constructClassInstance: function (workInProgress: Fiber, props: any): any {203 const ctor = workInProgress.type;204 const unmaskedContext = getUnmaskedContext(workInProgress);205 const needsContext = isContextConsumer(workInProgress);206 const context = needsContext ? getMaskedContext(workInProgress, unmaskedContext) : emptyObject;207 const instance = new ctor(props, context);208 adoptClassInstance(workInProgress, instance);209 // Cache unmasked context so we can avoid recreating masked context unless necessary.210 // ReactFiberContext usually updates this cache but can't for newly-created instances.211 if (needsContext) {212 cacheContext(workInProgress, unmaskedContext, context);213 }214 return instance;215 },216 mountClassInstance: function (workInProgress: Fiber, priorityLevel: PriorityLevel): void {217 const current = workInProgress.alternate;218 const instance = workInProgress.stateNode;219 const state = instance.state || null;220 let props = workInProgress.pendingProps;221 invariant(props, 'There must be pending props for an initial mount. This error is ' + 'likely caused by a bug in React. Please file an issue.');222 const unmaskedContext = getUnmaskedContext(workInProgress);223 instance.props = props;224 instance.state = state;225 instance.refs = emptyObject;226 instance.context = getMaskedContext(workInProgress, unmaskedContext);227 if (ReactFeatureFlags.enableAsyncSubtreeAPI && workInProgress.type != null && workInProgress.type.prototype != null && workInProgress.type.prototype.unstable_isAsyncReactComponent === true) {228 workInProgress.internalContextTag |= AsyncUpdates;229 }230 if (typeof instance.componentWillMount === 'function') {231 callComponentWillMount(workInProgress, instance);232 // If we had additional state updates during this life-cycle, let's233 // process them now.234 const updateQueue = workInProgress.updateQueue;235 if (updateQueue !== null) {236 instance.state = beginUpdateQueue(current, workInProgress, updateQueue, instance, state, props, priorityLevel);237 }238 }239 if (typeof instance.componentDidMount === 'function') {240 workInProgress.effectTag |= Update;241 }242 },243 // resumeMountClassInstance,244 updateClassInstance: function (current: Fiber, workInProgress: Fiber, priorityLevel: PriorityLevel): boolean {245 const instance = workInProgress.stateNode;...
lifecycle.js
Source:lifecycle.js
...36 }37 if (38 !isFunction(Constructor.getDerivedStateFromProps)39 ) {40 callComponentWillMount(workInProgress, instance);41 queue = workInProgress.queue;42 if (queue !== null) {43 processUpdate(workInProgress, queue);44 instance.state = workInProgress.memoizedState;45 }46 }47 if (isFunction(instance.componentDidMount)) {48 workInProgress.effectTag |= Update;49 }50}51function updateClassInstance () {}52function finishClassComponent (current, workInProgress, Constructor, shouldUpdate, hasContext) {53 const instance = workInProgress;54 ReactCurrentOwner,current = workInProgress;...
App.js
Source:App.js
1/**2 * @flow3 */4import React, {Component} from 'react';5import {Platform, StyleSheet, Text, View, Button} from 'react-native';6import nodejs from 'nodejs-mobile-react-native';7const uri = 'http://localhost:3000'8type Props = {};9export default class App extends Component<Props> {10 state = {11 whoami: null,12 path: null,13 }14 componentWillMount() {15 // nodejs.start('index.js');16 // NOTE2L17 // 18 // Just at the moment if I uncomment the above19 // I get this error:20 // ----21 // TypeError: null is not an object (evaluating 'RNNodeJsMobile.startNodeProject')22 // This error is located at:23 // in App (at renderApplication.js:35)24 // in RCTView (at View.js:45)25 // in View (at AppContainer.js:98)26 // in RCTView (at View.js:45)27 // in View (at AppContainer.js:115)28 // in AppContainer (at renderApplication.js:34)29 // start30 // index.js:17:1731 // componentWillMount32 // ReactFabric-prod.js:7014:433 // callComponentWillMount34 // Easing.js:152:2335 // mountClassInstance36 // I18nManager.js:20:7937 // ----38 }39 get = (i) => {40 fetch(`${uri}/${i}`)41 .then(res => res.json())42 .then(data => this.setState({ [i]: data }))43 .catch(err => alert(err))44 }45 render() {46 return (47 <View style={styles.container}>48 <Text style={styles.welcome}>49 Welcome to Scuttlebot on NodeJS Mobile!50 </Text>51 <Button title="Who am I"52 onPress={() => this.get('whoami')}53 />54 <Text>{JSON.stringify(this.state.whoami)}</Text>55 <Button title="Path"56 onPress={() => this.get('path')}57 />58 <Text>{JSON.stringify(this.state.path)}</Text>59 </View>60 );61 }62}63const styles = StyleSheet.create({64 container: {65 flex: 1,66 justifyContent: 'center',67 alignItems: 'center',68 backgroundColor: '#F5FCFF',69 },70 welcome: {71 fontSize: 20,72 textAlign: 'center',73 margin: 10,74 },...
Using AI Code Generation
1const { callComponentWillMount } = require('@playwright/test/lib/test');2callComponentWillMount();3const { callComponentWillUnmount } = require('@playwright/test/lib/test');4callComponentWillUnmount();5const { callComponentDidMount } = require('@playwright/test/lib/test');6callComponentDidMount();7const { callComponentDidUnmount } = require('@playwright/test/lib/test');8callComponentDidUnmount();9const { callComponentDidUpdate } = require('@playwright/test/lib/test');10callComponentDidUpdate();11const { callComponentDidCatch } = require('@playwright/test/lib/test');12callComponentDidCatch();13const { callComponentShouldUpdate } = require('@playwright/test/lib/test');14callComponentShouldUpdate();15const { callComponentWillUpdate } = require('@playwright/test/lib/test');16callComponentWillUpdate();17const { callComponentWillUnmount } = require('@playwright/test/lib/test');18callComponentWillUnmount();19const { callComponentWillUnmount } = require('@playwright/test/lib/test');20callComponentWillUnmount();21const { callComponentWillUnmount } = require('@playwright/test/lib/test');22callComponentWillUnmount();23const { callComponentWillUnmount } = require('@playwright/test/lib/test');24callComponentWillUnmount();25const { callComponentWillUnmount } = require('@playwright/test/lib/test');26callComponentWillUnmount();27const { callComponentWillUnmount } = require('@playwright/test/lib/test');28callComponentWillUnmount();
Using AI Code Generation
1const { PlaywrightInternal } = require('playwright-core/lib/server/playwright.js');2const { Page } = require('playwright-core/lib/server/page.js');3const { ElementHandle } = require('playwright-core/lib/server/dom.js');4const path = require('path');5const fs = require('fs');6const { chromium } = require('playwright-core');7(async () => {8 const browser = await chromium.launch();9 const context = await browser.newContext();10 const page = await context.newPage();11 const elementHandle = await page.$('input');12 const internal = new PlaywrightInternal();13 await internal.callComponentWillMount(page, elementHandle);14 await page.screenshot({ path: 'example.png' });15 await browser.close();16})();
Using AI Code Generation
1const { callComponentWillMount } = require('playwright/lib/internal-api');2callComponentWillMount();3const { callComponentWillUnmount } = require('playwright/lib/internal-api');4callComponentWillUnmount();5const { callComponentDidMount } = require('playwright/lib/internal-api');6callComponentDidMount();7const { callComponentDidUnmount } = require('playwright/lib/internal-api');8callComponentDidUnmount();9const { callComponentDidUpdate } = require('playwright/lib/internal-api');10callComponentDidUpdate();11const { callComponentWillUpdate } = require('playwright/lib/internal-api');12callComponentWillUpdate();13const { callShouldComponentUpdate } = require('playwright/lib/internal-api');14callShouldComponentUpdate();15const { callGetSnapshotBeforeUpdate } = require('playwright/lib/internal-api');16callGetSnapshotBeforeUpdate();17const { callGetDerivedStateFromProps } = require('playwright/lib/internal-api');18callGetDerivedStateFromProps();19const { callGetDerivedStateFromError } = require('playwright/lib/internal-api');20callGetDerivedStateFromError();21const { callGetDerivedStateFromCatch } = require('playwright/lib/internal-api');22callGetDerivedStateFromCatch();23const { callGetDerivedStateFromGetDerivedStateFromProps } = require('playwright/lib/internal-api');24callGetDerivedStateFromGetDerivedStateFromProps();25const { callGetDerivedStateFromGetDerivedStateFromError } = require('playwright/lib/internal
Using AI Code Generation
1const { callComponentWillMount } = require('playwright/lib/server/supplements/recorder/recorderSupplement');2callComponentWillMount();3const { callComponentWillUnmount } = require('playwright/lib/server/supplements/recorder/recorderSupplement');4callComponentWillUnmount();5const { callComponentDidMount } = require('playwright/lib/server/supplements/recorder/recorderSupplement');6callComponentDidMount();7const { callComponentDidUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement');8callComponentDidUpdate();9const { callComponentWillUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement');10callComponentWillUpdate();11const { callComponentWillReceiveProps } = require('playwright/lib/server/supplements/recorder/recorderSupplement');12callComponentWillReceiveProps();13const { callGetSnapshot } = require('playwright/lib/server/supplements/recorder/recorderSupplement');14callGetSnapshot();15const { callSetState } = require('playwright/lib/server/supplements/recorder/recorderSupplement');16callSetState();17const { callReplaceState } = require('playwright/lib/server/supplements/recorder/recorderSupplement');18callReplaceState();19const { callForceUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement');20callForceUpdate();21const { callRender } = require('playwright/lib/server/supplements/recorder/recorderSupplement');22callRender();23const { callShouldComponentUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement');24callShouldComponentUpdate();
Using AI Code Generation
1const { PlaywrightInternal } = require('@playwright/test');2const playwrightInternal = new PlaywrightInternal();3playwrightInternal.callComponentWillMount();4const { PlaywrightInternal } = require('@playwright/test');5const playwrightInternal = new PlaywrightInternal();6playwrightInternal.callComponentDidMount();7const { PlaywrightInternal } = require('@playwright/test');8const playwrightInternal = new PlaywrightInternal();9playwrightInternal.callComponentWillUnmount();10const { PlaywrightInternal } = require('@playwright/test');11const playwrightInternal = new PlaywrightInternal();12playwrightInternal.callComponentDidUnmount();13const { PlaywrightInternal } = require('@playwright/test');14const playwrightInternal = new PlaywrightInternal();15playwrightInternal.callComponentWillUpdate();16const { PlaywrightInternal } = require('@playwright/test');17const playwrightInternal = new PlaywrightInternal();18playwrightInternal.callComponentDidUpdate();19const { PlaywrightInternal } = require('@playwright/test');20const playwrightInternal = new PlaywrightInternal();21playwrightInternal.callComponentRender();22const { PlaywrightInternal } = require('@playwright/test');23const playwrightInternal = new PlaywrightInternal();24playwrightInternal.callComponentRender();25const { PlaywrightInternal } = require('@playwright/test');26const playwrightInternal = new PlaywrightInternal();27playwrightInternal.callComponentRender();28const { PlaywrightInternal } = require('@playwright/test');29const playwrightInternal = new PlaywrightInternal();30playwrightInternal.callComponentRender();31const { PlaywrightInternal } = require('@playwright/test');32const playwrightInternal = new PlaywrightInternal();33playwrightInternal.callComponentRender();34const { PlaywrightInternal } = require('@playwright/test');
Using AI Code Generation
1const { callComponentWillMount } = require('@playwright/test/lib/server/frames');2const { test } = require('@playwright/test');3test('test', async ({ page }) => {4 await callComponentWillMount(page);5 await page.screenshot({ path: 'google.png' });6});7const { callComponentWillMount } = require('@playwright/test/lib/server/frames');8const { test } = require('@playwright/test');9test('test', async ({ page }) => {10 await callComponentWillMount(page);11 await page.screenshot({ path: 'google.png' });12});13const { callComponentWillMount } = require('@playwright/test/lib/server/frames');14const { test } = require('@playwright/test');15test('test', async ({ page }) => {16 await callComponentWillMount(page);17 await page.screenshot({ path: 'google.png' });18});19const { callComponentWillMount } = require('@playwright/test/lib/server/frames');20const { test } = require('@playwright/test');21test('test', async ({ page }) => {22 await callComponentWillMount(page);23 await page.screenshot({ path: 'google.png' });24});25const { callComponentWillMount } = require('@playwright/test/lib/server/frames');26const { test } = require('@playwright/test');27test('test', async ({ page }) => {28 await callComponentWillMount(page);29 await page.screenshot({ path: 'google.png' });30});31const { callComponentWillMount } = require('@playwright/test/lib/server/frames');32const { test } = require('@playwright/test');33test('test',
Using AI Code Generation
1const { callComponentWillMount } = require('@playwright/test/lib/server/frames');2const { test } = require('@playwright/test');3test('test', async ({ page }) => {4 await callComponentWillMount(page.mainFrame());5});6import React from 'react';7import ReactDOM from 'react-dom';8import './index.css';9import App from './App';10ReactDOM.render(11 document.getElementById('root')12);13import React from 'react';14import './App.css';15class App extends React.Component {16 constructor(props) {17 super(props);18 this.state = { count: 0 };19 }20 componentDidMount() {21 this.setState({ count: this.state.count + 1 });22 console.log('Component mounted');23 }24 render() {25 return (26 <h2>{this.state.count}</h2>27 );28 }29}30export default App;31.App {32 text-align: center;33}34.App-logo {35 height: 40vmin;36 pointer-events: none;37}38.App-header {39 background-color: #282c34;40 min-height: 100vh;41 display: flex;42 flex-direction: column;43 align-items: center;44 justify-content: center;45 font-size: calc(10px + 2vmin);46 color: white;47}48.App-link {49 color: #61dafb;50}
Using AI Code Generation
1const {callComponentWillMount} = require('@playwright/test/lib/test');2const {test} = require('@playwright/test');3test('test', async ({page}) => {4 await callComponentWillMount(page);5});6callComponentWillMount(page)7callComponentDidMount(page)8callComponentWillUnmount(page)9callComponentDidCatch(page)10callComponentDidUpdate(page)11callComponentShouldUpdate(page)12callComponentWillReceiveProps(page)13callComponentWillUpdate(page)14callComponentGetSnapshotBeforeUpdate(page)15callComponentGetDerivedStateFromProps(page)16callComponentGetDerivedStateFromError(page)17callComponentGetDerivedStateFromCatch(page)18callComponentGetSnapshotBeforeError(page)
Using AI Code Generation
1const { callComponentWillMount } = require('playwright-core/lib/server/supplements/utils/playwrightSupplementHelper');2const playwright = require('playwright-core');3const browser = await playwright['chromium'].launch();4const page = await browser.newPage();5await callComponentWillMount(page);6const component = page._component;7await component.componentDidMount();8await component.componentWillUnmount();9await browser.close();10const { callComponentWillMount } = require('playwright-core/lib/server/supplements/utils/playwrightSupplementHelper');11const playwright = require('playwright-core');12const browser = await playwright['chromium'].launch();13const page = await browser.newPage();14await callComponentWillMount(page);15const component = page._component;16await component.componentDidMount();17await component.componentWillUnmount();18await browser.close();19const { callComponentWillMount } = require('playwright-core/lib/server/supplements/utils/playwrightSupplementHelper');20const playwright = require('playwright-core');21const browser = await playwright['chromium'].launch();22const page = await browser.newPage();23await callComponentWillMount(page);24const component = page._component;25await component.componentDidMount();26await component.componentWillUnmount();27await browser.close();
Using AI Code Generation
1const playwrightInternalServer = require('@playwright/test/lib/internal/server/playwrightServer');2const { callComponentWillMount } = playwrightInternalServer;3const { ComponentWillMountComponent } = require('./componentWillMountComponent');4const result = callComponentWillMount(ComponentWillMountComponent, { name: 'John' });5console.log(result);6const { Component } = require('@playwright/test');7module.exports.ComponentWillMountComponent = class ComponentWillMountComponent extends Component {8 constructor(page, params) {9 super(page, params);10 }11 async componentWillMount() {12 return this.params;13 }14};15const result = new ComponentWillMountComponent(page, { name: 'John' }).componentWillMount();
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.
Run Playwright Internal automation tests on LambdaTest cloud grid
Perform automation testing on 3000+ real desktop and mobile devices online.
Try LambdaTest Now !!
Get 100 minutes of automation test minutes FREE!!
Was this article helpful?
