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How to use getWorkInProgressRoot method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberTransitionPool.old.js

...34  if (cacheResumedFromPreviousRender !== null) {35    return cacheResumedFromPreviousRender;36  }37  // Otherwise, check the root's cache pool.38  const root = (getWorkInProgressRoot(): any);39  const cacheFromRootCachePool = root.pooledCache;40  return cacheFromRootCachePool;41}42export function requestCacheFromPool(renderLanes: Lanes): Cache {43  // Similar to previous function, except if there's not already a cache in the44  // pool, we allocate a new one.45  const cacheFromPool = peekCacheFromPool();46  if (cacheFromPool !== null) {47    return cacheFromPool;48  }49  // Create a fresh cache and add it to the root cache pool. A cache can have50  // multiple owners:51  // - A cache pool that lives on the FiberRoot. This is where all fresh caches52  //   are originally created (TODO: except during refreshes, until we implement53  //   this correctly). The root takes ownership immediately when the cache is54  //   created. Conceptually, root.pooledCache is an Option<Arc<Cache>> (owned),55  //   and the return value of this function is a &Arc<Cache> (borrowed).56  // - One of several fiber types: host root, cache boundary, suspense57  //   component. These retain and release in the commit phase.58  const root = (getWorkInProgressRoot(): any);59  const freshCache = createCache();60  root.pooledCache = freshCache;61  retainCache(freshCache);62  if (freshCache !== null) {63    root.pooledCacheLanes |= renderLanes;64  }65  return freshCache;66}67export function pushRootTransitionPool(root: FiberRoot) {68  if (enableCache) {69    return;70  }71  // Note: This function currently does nothing but I'll leave it here for72  // code organization purposes in case that changes....

ReactFiberTransition.new.js

Source: ReactFiberTransition.new.js

...34  if (cacheResumedFromPreviousRender !== null) {35    return cacheResumedFromPreviousRender;36  }37  // Otherwise, check the root's cache pool.38  const root = (getWorkInProgressRoot(): any);39  const cacheFromRootCachePool = root.pooledCache;40  return cacheFromRootCachePool;41}42export function requestCacheFromPool(renderLanes: Lanes): Cache {43  // Similar to previous function, except if there's not already a cache in the44  // pool, we allocate a new one.45  const cacheFromPool = peekCacheFromPool();46  if (cacheFromPool !== null) {47    return cacheFromPool;48  }49  // Create a fresh cache and add it to the root cache pool. A cache can have50  // multiple owners:51  // - A cache pool that lives on the FiberRoot. This is where all fresh caches52  //   are originally created (TODO: except during refreshes, until we implement53  //   this correctly). The root takes ownership immediately when the cache is54  //   created. Conceptually, root.pooledCache is an Option<Arc<Cache>> (owned),55  //   and the return value of this function is a &Arc<Cache> (borrowed).56  // - One of several fiber types: host root, cache boundary, suspense57  //   component. These retain and release in the commit phase.58  const root = (getWorkInProgressRoot(): any);59  const freshCache = createCache();60  root.pooledCache = freshCache;61  retainCache(freshCache);62  if (freshCache !== null) {63    root.pooledCacheLanes |= renderLanes;64  }65  return freshCache;66}67export function pushRootTransition(root: FiberRoot) {68  if (enableCache) {69    return;70  }71  // Note: This function currently does nothing but I'll leave it here for72  // code organization purposes in case that changes....

ReactFiberTransition.old.js

Source: ReactFiberTransition.old.js

...34  if (cacheResumedFromPreviousRender !== null) {35    return cacheResumedFromPreviousRender;36  }37  // Otherwise, check the root's cache pool.38  const root = (getWorkInProgressRoot(): any);39  const cacheFromRootCachePool = root.pooledCache;40  return cacheFromRootCachePool;41}42export function requestCacheFromPool(renderLanes: Lanes): Cache {43  // Similar to previous function, except if there's not already a cache in the44  // pool, we allocate a new one.45  const cacheFromPool = peekCacheFromPool();46  if (cacheFromPool !== null) {47    return cacheFromPool;48  }49  // Create a fresh cache and add it to the root cache pool. A cache can have50  // multiple owners:51  // - A cache pool that lives on the FiberRoot. This is where all fresh caches52  //   are originally created (TODO: except during refreshes, until we implement53  //   this correctly). The root takes ownership immediately when the cache is54  //   created. Conceptually, root.pooledCache is an Option<Arc<Cache>> (owned),55  //   and the return value of this function is a &Arc<Cache> (borrowed).56  // - One of several fiber types: host root, cache boundary, suspense57  //   component. These retain and release in the commit phase.58  const root = (getWorkInProgressRoot(): any);59  const freshCache = createCache();60  root.pooledCache = freshCache;61  retainCache(freshCache);62  if (freshCache !== null) {63    root.pooledCacheLanes |= renderLanes;64  }65  return freshCache;66}67export function pushRootTransition(root: FiberRoot) {68  if (enableCache) {69    return;70  }71  // Note: This function currently does nothing but I'll leave it here for72  // code organization purposes in case that changes....

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  await page.screenshot({ path: 'google.png' });7  await browser.close();8})();9const { chromium } = require('playwright');10(async () => {11  const browser = await chromium.launch();12  const context = await browser.newContext();13  const page = await context.newPage();14  await page.screenshot({ path: 'google.png' });15  await browser.close();16})();17const { chromium } = require('playwright');18(async () => {19  const browser = await chromium.launch();20  const context = await browser.newContext();21  const page = await context.newPage();22  await page.screenshot({ path: 'google.png' });23  await browser.close();24})();25const { chromium } = require('playwright');26(async () => {27  const browser = await chromium.launch();28  const context = await browser.newContext();29  const page = await context.newPage();30  await page.screenshot({ path: 'google.png' });31  await browser.close();32})();33const { chromium } = require('playwright');34(async () => {35  const browser = await chromium.launch();36  const context = await browser.newContext();37  const page = await context.newPage();38  await page.screenshot({ path: 'google.png' });39  await browser.close();40})();41const { chromium } = require('playwright');42(async () => {43  const browser = await chromium.launch();44  const context = await browser.newContext();45  const page = await context.newPage();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const title = await page.title();7  console.log('Page title: ' + title);8  const root = await page._delegate.getWorkInProgressRoot();9  console.log('Root: ' + root);10  await browser.close();11})();12const { chromium } = require('playwright');13(async () => {14  const browser = await chromium.launch();15  const context = await browser.newContext();16  const page = await context.newPage();17  await page.waitForLoadState('load');18  const root = await page._delegate.getWorkInProgressRoot();19  console.log('Root: ' + root);20  await browser.close();21})();

Using AI Code Generation

1const { chromium } = require('playwright');2const { getWorkInProgressRoot } = require('playwright/lib/server/browserContext');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const root = getWorkInProgressRoot(page);8  console.log(root);9  await browser.close();10})();11const { chromium } = require('playwright');12const { getWorkInProgressRoot } = require('playwright/lib/server/browserContext');13(async () => {14  const browser = await chromium.launch();15  const context = await browser.newContext();16  const page = await context.newPage();17  const root = getWorkInProgressRoot(page);18  console.log(root);19  await browser.close();20})();21const { chromium } = require('playwright');22const { getWorkInProgressRoot } = require('playwright/lib/server/browserContext');23(async () => {24  const browser = await chromium.launch();25  const context = await browser.newContext();26  const page = await context.newPage();27  const root = getWorkInProgressRoot(page);28  console.log(root);29  await browser.close();30})();31const { chromium } = require('playwright');32const { getWorkInProgressRoot } = require('playwright/lib/server/browserContext');33(async () => {34  const browser = await chromium.launch();35  const context = await browser.newContext();36  const page = await context.newPage();37  const root = getWorkInProgressRoot(page);38  console.log(root);39  await browser.close();40})();41const { chromium } = require('playwright');42const { getWorkInProgressRoot } = require('playwright/lib/server/browserContext');43(async () => {44  const browser = await chromium.launch();45  const context = await browser.newContext();46  const page = await context.newPage();47  const root = getWorkInProgressRoot(page);48  console.log(root);49  await browser.close();50})();51const {

Using AI Code Generation

1const { getWorkInProgressRoot } = require('playwright/lib/server/chromium/crPage');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const root = getWorkInProgressRoot(page);8  console.log(root);9  await browser.close();10})();

Using AI Code Generation

1const { getWorkInProgressRoot } = require("playwright/lib/server/browserContext");2const { chromium } = require("playwright");3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const root = getWorkInProgressRoot(context);8  const frame = page.mainFrame();9  const handle = await frame.$("h1");10  const result = await handle.evaluate((node) => node.textContent);11  console.log(result);12  await browser.close();13})();14const { getWorkInProgressRoot } = require("playwright/lib/server/browserContext");15const { chromium } = require("playwright");16(async () => {17  const browser = await chromium.launch();18  const context = await browser.newContext();19  const page = await context.newPage();20  const root = getWorkInProgressRoot(context);21  const frame = page.mainFrame();22  const handle = await frame.$("h1");23  const result = await handle.evaluate((node) => node.textContent);24  console.log(result);25  await browser.close();26})();27const { getWorkInProgressRoot } = require("playwright/lib/server/browserContext");28const { chromium } = require("playwright");29(async () => {30  const browser = await chromium.launch();31  const context = await browser.newContext();32  const page = await context.newPage();33  const root = getWorkInProgressRoot(context);34  const frame = page.mainFrame();35  const handle = await frame.$("h1");36  const result = await handle.evaluate((node) => node.textContent);37  console.log(result);38  await browser.close();39})();40const { getWorkInProgressRoot } = require("playwright/lib/server/browserContext");41const { chromium } = require("playwright");42(async () => {43  const browser = await chromium.launch();44  const context = await browser.newContext();

Using AI Code Generation

1const { getWorkInProgressRoot } = require('playwright/lib/server/frames');2const { chromium } = require('playwright');3const fs = require('fs');4(async () => {5  const browser = await chromium.launch({ headless: false });6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.click('text=Start');9  await page.click('text=Stop');10  const root = getWorkInProgressRoot(page.mainFrame());11  const fiber = root.current;12  const stateNode = fiber.stateNode;13  const state = stateNode.memoizedState;14  const value = state.current;15  console.log(value);16  await browser.close();17})();18const { getWorkInProgressRoot } = require('playwright/lib/server/frames');19const { chromium } = require('playwright');20const fs = require('fs');21(async () => {22  const browser = await chromium.launch({ headless: false });23  const context = await browser.newContext();24  const page = await context.newPage();25  await page.click('text=Start');26  await page.click('text=Stop');27  const root = getWorkInProgressRoot(page.mainFrame());28  const fiber = root.current;29  const stateNode = fiber.stateNode;30  const state = stateNode.memoizedState;31  const value = state.current;32  console.log(value);33  await browser.close();34})();35const { getWorkInProgressRoot } = require('playwright/lib/server/frames');36const { chromium } = require('playwright');37const fs = require('fs');38(async () => {39  const browser = await chromium.launch({ headless: false });40  const context = await browser.newContext();

Using AI Code Generation

1const playwright = require('playwright');2const { getWorkInProgressRoot } = require('playwright/lib/server/browserContext');3const browser = await playwright.chromium.launch();4const context = await browser.newContext();5const page = await context.newPage();6const workInProgressRoot = getWorkInProgressRoot(page);7console.log(workInProgressRoot);8await browser.close();9module.exports = {10  use: {11    viewport: { width: 1280, height: 720 },12    launchOptions: {13    },14  },15};16const { test, expect } = require('@playwright/test');17test('Test', async ({ page }) => {18  const title = page.locator('h1');19  await expect(title).toHaveText('Playwright');20});21{22  "scripts": {23  },24  "dependencies": {25  }26}27const page = workInProgressRoot._page;28const page = workInProgressRoot._page;

Using AI Code Generation

1const { getWorkInProgressRoot } = require('playwright/lib/server/chromium/crPage');2const browser = await chromium.launch();3const page = await browser.newPage();4const context = page._delegate._context;5const root = getWorkInProgressRoot(context);6console.log(root);7await browser.close();8Output: { _root: null, _rootContainer: null, _internalRoot: null }

Using AI Code Generation

1const { getWorkInProgressRoot } = require('playwright/lib/server/chromium/crPage');2const page = await browser.newPage();3const root = getWorkInProgressRoot(page);4const playwright = require('playwright-core');5const { getWorkInProgressRoot } = require('playwright/lib/server/chromium/crPage');6const browser = await playwright.chromium.launch();7const page = await browser.newPage();8const root = getWorkInProgressRoot(page);

StackOverFlow community discussions

Questions

Discussion

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

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

firefox browser does not start in playwright

Running Playwright in Azure Function

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

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

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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:

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