How to use prepareToReadContext method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberBeginWork.js

Source: ReactFiberBeginWork.js Github

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...49 pushHostContainer(workInProgress, root.containerInfo);50}51function updateFunctionComponent(current, workInProgress, Component, nextProps, renderLanes) {52 let context;53 prepareToReadContext(workInProgress, renderLanes);54 let nextChildren = renderWithHooks(current, workInProgress, Component, nextProps, '', renderLanes);55 if(current !== null && !didReceiveUpdate) {56 bailoutHooks(current, workInProgress, renderLanes);57 return bailoutOnAlreadyFinishedWork(current, workInProgress, renderLanes);58 }59 reconcileChildren(current, workInProgress, nextChildren, renderLanes);60 return workInProgress.child;61}62function updateHostRoot(current, workInProgress, renderLanes) {63 pushHostRootContext(workInProgress);64 const updateQueue = workInProgress.updateQueue;65 const nexrProps = workInProgress.pendingProps;66 const prevState = workInProgress.memoizedState;67 const prevChildren = prevState !== null ? prevState.element: null;68 cloneUpdateQueue(current, workInProgress);69 /​/​ 处理更新队列事物70 processUpdateQueue(workInProgress, nexrProps, null, renderLanes);71 const nextState = workInProgress.memoizedState;72 const nextChildren = nextState.element;73 if(nextChildren === prevChildren) {74 return bailoutOnAlreadyFinishedWork(current, workInProgress, renderLanes);75 }76 reconcileChildren(current, workInProgress, nextChildren, renderLanes);77 return workInProgress.child;78}79function updateHostComponent(current, workInProgress, renderLanes) {80 pushHostContext(workInProgress);81 const type = workInProgress.type;82 const nextProps = workInProgress.pendingProps;83 const prevProps = current !== null ? current.memoizedProps : null;84 let nextChildren = nextProps.children;85 const isDirectTextChild = shouldSetTextContent(type, nextProps);86 if(isDirectTextChild) {87 nextChildren = null;88 } else if(prevProps !== null && shouldSetTextContent(type, prevProps)) {89 workInProgress.flags |= ContentReset;90 }91 workInProgress.flags |= PerformedWork;92 reconcileChildren(current, workInProgress, nextChildren, renderLanes);93 return workInProgress.child;94}95function updateHostText(current, workInProgress) {96 return null;97}98function mountIndeterminateComponent(_current, workInProgress, Component, renderLanes) {99 if(_current !== null) {100 _current.alternate = null;101 workInProgress.alternate = null;102 workInProgress.flags |= Placement;103 } 104 const props = workInProgress.pendingProps;105 let context;106 prepareToReadContext(workInProgress, renderLanes);107 let value;108 value = renderWithHooks(109 null,110 workInProgress,111 Component,112 props,113 context,114 renderLanes115 );116 workInProgress.flags |= PerformedWork;117 if(118 !disableModulePatternComponents &&119 typeof value === 'object' &&120 value !== null &&...

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ReactFiberNewContext.js

Source: ReactFiberNewContext.js Github

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1import { includesSomeLane, NoLanes } from './​ReactFiberLane';2import { markWorkInProgressReceivedUpdate } from './​ReactFiberBeginWork';3const invariant = require('invariant');4const MAX_SIGNED_31_BIT_INT = 1073741823;5let currentlyRenderingFiber = null;6let lastContextDependency = null;7let lastContextWithAllBitsObserved = null;8const resetContextDependencies = () => {9 currentlyRenderingFiber = null;10 lastContextDependency = null;11 lastContextWithAllBitsObserved = null;12};13const prepareToReadContext = (workInProgress, renderLanes) => {14 currentlyRenderingFiber = workInProgress;15 lastContextDependency = null;16 lastContextWithAllBitsObserved = null;17 const dependencies = workInProgress.dependencies;18 if (dependencies !== null) {19 const firstContext = dependencies.firstContext;20 if (firstContext !== null) {21 if (includesSomeLane(dependencies.lanes, renderLanes)) {22 markWorkInProgressReceivedUpdate();23 }24 dependencies.firstContext = null;25 }26 }27};28const readContext = (context, observedBits) => {29 if (lastContextWithAllBitsObserved === context) {30 /​/​ Nothing to do. We already observe everything in this context.31 } else if (observedBits === false || observedBits === 0) {32 /​/​ Do not observe any updates.33 } else {34 let resolvedObservedBits;35 if (36 typeof observedBits !== 'number' ||37 observedBits === MAX_SIGNED_31_BIT_INT38 ) {39 lastContextWithAllBitsObserved = context;40 resolvedObservedBits = MAX_SIGNED_31_BIT_INT;41 } else {42 resolvedObservedBits = observedBits;43 }44 const contextItem = {45 context: context,46 observedBits: resolvedObservedBits,47 next: null,48 };49 if (lastContextDependency === null) {50 invariant(51 currentlyRenderingFiber !== null,52 'Context can only be read while React is rendering. ' +53 'In classes, you can read it in the render method or getDerivedStateFromProps. ' +54 'In function components, you can read it directly in the function body, but not ' +55 'inside Hooks like useReducer() or useMemo().'56 );57 lastContextDependency = contextItem;58 currentlyRenderingFiber.dependencies = {59 lanes: NoLanes,60 firstContext: contextItem,61 responders: null,62 };63 } else {64 lastContextDependency = lastContextDependency.next = contextItem;65 }66 }67 return context._currentValue;68};...

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prepareToReadContext.js

Source: prepareToReadContext.js Github

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1export default function prepareToReadContext (2 workInProgress3) {4 ...

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Using AI Code Generation

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1const { chromium } = require('playwright');2const path = require('path');3const fs = require('fs');4(async () => {5 const browser = await chromium.launch();6 const context = await browser.newContext();7 const page = await context.newPage();8 const contextPath = path.join(__dirname, 'context');9 fs.mkdirSync(contextPath, { recursive: true });10 const contextId = await context._browser._prepareToReadContext(contextPath);11 console.log(`contextId: ${contextId}`);12 await page.screenshot({ path: 'google.png' });13 await browser.close();14})();

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Using AI Code Generation

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1const { prepareToReadContext } = require('playwright/​lib/​server/​browserContext');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 await prepareToReadContext(context);7 await context.close();8 await browser.close();9})();

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Using AI Code Generation

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1const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");2const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");3const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");4const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");5const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");6const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");7const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");8const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");9const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");10const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");11const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");12const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");13const { prepareToReadContext } = require("playwright/​lib/​server/​supplements/​recorder/​recorderSupplement");

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Using AI Code Generation

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1const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');2const context = await browser.newContext();3await prepareToReadContext(context);4const cookies = await context.storageState({ path: 'cookies.json' });5console.log(cookies);6const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');7const context = await browser.newContext();8await prepareToReadContext(context);9const localStorage = await context.storageState({ path: 'localStorage.json' });10console.log(localStorage);11const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');12const context = await browser.newContext();13await prepareToReadContext(context);14const sessionStorage = await context.storageState({ path: 'sessionStorage.json' });15console.log(sessionStorage);16const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');17const context = await browser.newContext();18await prepareToReadContext(context);19const indexedDB = await context.storageState({ path: 'indexedDB.json' });20console.log(indexedDB);21const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');22const context = await browser.newContext();23await prepareToReadContext(context);24const webSQL = await context.storageState({ path: 'webSQL.json' });25console.log(webSQL);26const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');27const context = await browser.newContext();28await prepareToReadContext(context);29const cacheStorage = await context.storageState({ path: 'cacheStorage.json' });30console.log(cacheStorage);31const { prepareToReadContext } = require('playwright/​lib/​server/​chromium/​crBrowser');32const context = await browser.newContext();33await prepareToReadContext(context);34const serviceWorkers = await context.storageState({ path: 'serviceWorkers.json' });35console.log(serviceWorkers);

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Using AI Code Generation

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1const { prepareToReadContext } = require('playwright/​lib/​utils/​stackTrace');2const stackTrace = prepareToReadContext(new Error());3console.log(stackTrace);4const { parseCallFrames } = require('playwright/​lib/​utils/​stackTrace');5const stackTrace = parseCallFrames(new Error());6console.log(stackTrace);7const { getCallMetadata } = require('playwright/​lib/​utils/​stackTrace');8const stackTrace = getCallMetadata(new Error());9console.log(stackTrace);10const { convertCallFrames } = require('playwright/​lib/​utils/​stackTrace');11const stackTrace = convertCallFrames(new Error());12console.log(stackTrace);13const { parseStackString } = require('playwright/​lib/​utils/​stackTrace');14const stackTrace = parseStackString(new Error());15console.log(stackTrace);16const { stackTraceFromError } = require('playwright/​lib/​utils/​stackTrace');17const stackTrace = stackTraceFromError(new Error());18console.log(stackTrace);19const { stackTraceFromError } = require('playwright/​lib/​utils/​stackTrace');20const stackTrace = stackTraceFromError(new Error());21console.log(stackTrace);22const { stackTraceFromError } = require('playwright/​lib/​utils/​stackTrace');23const stackTrace = stackTraceFromError(new Error());24console.log(stackTrace);25const { stackTraceFromError } = require('playwright/​lib/​utils/​stackTrace');26const stackTrace = stackTraceFromError(new Error());27console.log(stackTrace);28const { stackTraceFromError } = require('playwright/​lib/​utils/​stackTrace');29const stackTrace = stackTraceFromError(new Error());30console.log(stackTrace);31const { stackTraceFromError } = require('playwright/​lib/​utils/​stackTrace');

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Using AI Code Generation

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1const { _electron } = require('playwright');2const context = await _electron.launch().then((app) => app.firstWindow().then((win) => win._page._delegate._browserContext));3context._browser._prepareToReadContext(context);4await context._browser._readContext(context);5const { _electron } = require('playwright');6const context = await _electron.launch().then((app) => app.firstWindow().then((win) => win._page._delegate._browserContext));7context._browser._prepareToReadContext(context);8await context._browser._readContext(context);9const { _electron } = require('playwright');10const context = await _electron.launch().then((app) => app.firstWindow().then((win) => win._page._delegate._browserContext));11context._browser._prepareToReadContext(context);12await context._browser._readContext(context);13const { _electron } = require('playwright');14const context = await _electron.launch().then((app) => app.firstWindow().then((win) => win._page._delegate._browserContext));15context._browser._prepareToReadContext(context);16await context._browser._readContext(context);17const { _electron } = require('playwright');18const context = await _electron.launch().then((app) => app.firstWindow().then((win) => win._page._delegate._browserContext));19context._browser._prepareToReadContext(context);20await context._browser._readContext(context);21const { _electron } = require('playwright');22const context = await _electron.launch().then((app) => app.firstWindow().then((win) => win._page._delegate._browserContext));23context._browser._prepareToReadContext(context);24await context._browser._readContext(context);25const { _electron } = require('playwright');26const context = await _electron.launch().then((app) => app.first

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Using AI Code Generation

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1const { chromium } = require('playwright');2const fs = require('fs');3const contextOptions = JSON.parse(fs.readFileSync('context.json', 'utf8'));4const context = await chromium.launchPersistentContext('data', contextOptions);5const page = await context.newPage();6await page.screenshot({path: 'example.png'});7await context.close();

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StackOverFlow community discussions

Questions
Discussion

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

firefox browser does not start in playwright

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

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

Running Playwright in Azure Function

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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