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How to use requestCurrentTimeForUpdate method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberReconciler.old.js

Source:ReactFiberReconciler.old.js

...232  if (__DEV__) {233    onScheduleRoot(container, element);234  }235  const current = container.current;236  const currentTime = requestCurrentTimeForUpdate();237  if (__DEV__) {238    // $FlowExpectedError - jest isn't a global, and isn't recognized outside of tests239    if ('undefined' !== typeof jest) {240      warnIfUnmockedScheduler(current);241      warnIfNotScopedWithMatchingAct(current);242    }243  }244  const suspenseConfig = requestCurrentSuspenseConfig();245  const expirationTime = computeExpirationForFiber(246    currentTime,247    current,248    suspenseConfig,249  );250  const context = getContextForSubtree(parentComponent);251  if (container.context === null) {252    container.context = context;253  } else {254    container.pendingContext = context;255  }256  if (__DEV__) {257    if (258      ReactCurrentFiberIsRendering &&259      ReactCurrentFiberCurrent !== null &&260      !didWarnAboutNestedUpdates261    ) {262      didWarnAboutNestedUpdates = true;263      console.error(264        'Render methods should be a pure function of props and state; ' +265          'triggering nested component updates from render is not allowed. ' +266          'If necessary, trigger nested updates in componentDidUpdate.\n\n' +267          'Check the render method of %s.',268        getComponentName(ReactCurrentFiberCurrent.type) || 'Unknown',269      );270    }271  }272  const update = createUpdate(expirationTime, suspenseConfig);273  // Caution: React DevTools currently depends on this property274  // being called "element".275  update.payload = {element};276  callback = callback === undefined ? null : callback;277  if (callback !== null) {278    if (__DEV__) {279      if (typeof callback !== 'function') {280        console.error(281          'render(...): Expected the last optional `callback` argument to be a ' +282            'function. Instead received: %s.',283          callback,284        );285      }286    }287    update.callback = callback;288  }289  enqueueUpdate(current, update);290  scheduleUpdateOnFiber(current, expirationTime);291  return expirationTime;292}293export {294  batchedEventUpdates,295  batchedUpdates,296  unbatchedUpdates,297  deferredUpdates,298  discreteUpdates,299  flushDiscreteUpdates,300  flushControlled,301  flushSync,302  flushPassiveEffects,303  IsThisRendererActing,304  act,305};306export function getPublicRootInstance(307  container: OpaqueRoot,308): React$Component<any, any> | PublicInstance | null {309  const containerFiber = container.current;310  if (!containerFiber.child) {311    return null;312  }313  switch (containerFiber.child.tag) {314    case HostComponent:315      return getPublicInstance(containerFiber.child.stateNode);316    default:317      return containerFiber.child.stateNode;318  }319}320export function attemptSynchronousHydration(fiber: Fiber): void {321  switch (fiber.tag) {322    case HostRoot:323      const root: FiberRoot = fiber.stateNode;324      if (root.hydrate) {325        // Flush the first scheduled "update".326        flushRoot(root, root.firstPendingTime);327      }328      break;329    case SuspenseComponent:330      flushSync(() => scheduleUpdateOnFiber(fiber, Sync));331      // If we're still blocked after this, we need to increase332      // the priority of any promises resolving within this333      // boundary so that they next attempt also has higher pri.334      const retryExpTime = computeInteractiveExpiration(335        requestCurrentTimeForUpdate(),336      );337      markRetryTimeIfNotHydrated(fiber, retryExpTime);338      break;339  }340}341function markRetryTimeImpl(fiber: Fiber, retryTime: ExpirationTime) {342  const suspenseState: null | SuspenseState = fiber.memoizedState;343  if (suspenseState !== null && suspenseState.dehydrated !== null) {344    if (suspenseState.retryTime < retryTime) {345      suspenseState.retryTime = retryTime;346    }347  }348}349// Increases the priority of thennables when they resolve within this boundary.350function markRetryTimeIfNotHydrated(fiber: Fiber, retryTime: ExpirationTime) {351  markRetryTimeImpl(fiber, retryTime);352  const alternate = fiber.alternate;353  if (alternate) {354    markRetryTimeImpl(alternate, retryTime);355  }356}357export function attemptUserBlockingHydration(fiber: Fiber): void {358  if (fiber.tag !== SuspenseComponent) {359    // We ignore HostRoots here because we can't increase360    // their priority and they should not suspend on I/O,361    // since you have to wrap anything that might suspend in362    // Suspense.363    return;364  }365  const expTime = computeInteractiveExpiration(requestCurrentTimeForUpdate());366  scheduleUpdateOnFiber(fiber, expTime);367  markRetryTimeIfNotHydrated(fiber, expTime);368}369export function attemptContinuousHydration(fiber: Fiber): void {370  if (fiber.tag !== SuspenseComponent) {371    // We ignore HostRoots here because we can't increase372    // their priority and they should not suspend on I/O,373    // since you have to wrap anything that might suspend in374    // Suspense.375    return;376  }377  scheduleUpdateOnFiber(fiber, ContinuousHydration);378  markRetryTimeIfNotHydrated(fiber, ContinuousHydration);379}380export function attemptHydrationAtCurrentPriority(fiber: Fiber): void {381  if (fiber.tag !== SuspenseComponent) {382    // We ignore HostRoots here because we can't increase383    // their priority other than synchronously flush it.384    return;385  }386  const currentTime = requestCurrentTimeForUpdate();387  const expTime = computeExpirationForFiber(currentTime, fiber, null);388  scheduleUpdateOnFiber(fiber, expTime);389  markRetryTimeIfNotHydrated(fiber, expTime);390}391export {findHostInstance};392export {findHostInstanceWithWarning};393export function findHostInstanceWithNoPortals(394  fiber: Fiber,395): PublicInstance | null {396  const hostFiber = findCurrentHostFiberWithNoPortals(fiber);397  if (hostFiber === null) {398    return null;399  }400  if (hostFiber.tag === FundamentalComponent) {...

ReactFiberReconciler.js

Source:ReactFiberReconciler.js

...213  if (__DEV__) {214    onScheduleRoot(container, element);215  }216  const current = container.current;217  const currentTime = requestCurrentTimeForUpdate();218  if (__DEV__) {219    // $FlowExpectedError - jest isn't a global, and isn't recognized outside of tests220    if ('undefined' !== typeof jest) {221      warnIfUnmockedScheduler(current);222      warnIfNotScopedWithMatchingAct(current);223    }224  }225  const suspenseConfig = requestCurrentSuspenseConfig();226  const expirationTime = computeExpirationForFiber(227    currentTime,228    current,229    suspenseConfig,230  );231  const context = getContextForSubtree(parentComponent);232  if (container.context === null) {233    container.context = context;234  } else {235    container.pendingContext = context;236  }237  if (__DEV__) {238    if (239      ReactCurrentFiberPhase === 'render' &&240      ReactCurrentFiberCurrent !== null &&241      !didWarnAboutNestedUpdates242    ) {243      didWarnAboutNestedUpdates = true;244      console.error(245        'Render methods should be a pure function of props and state; ' +246          'triggering nested component updates from render is not allowed. ' +247          'If necessary, trigger nested updates in componentDidUpdate.\n\n' +248          'Check the render method of %s.',249        getComponentName(ReactCurrentFiberCurrent.type) || 'Unknown',250      );251    }252  }253  const update = createUpdate(expirationTime, suspenseConfig);254  // Caution: React DevTools currently depends on this property255  // being called "element".256  update.payload = {element};257  callback = callback === undefined ? null : callback;258  if (callback !== null) {259    if (__DEV__) {260      if (typeof callback !== 'function') {261        console.error(262          'render(...): Expected the last optional `callback` argument to be a ' +263            'function. Instead received: %s.',264          callback,265        );266      }267    }268    update.callback = callback;269  }270  enqueueUpdate(current, update);271  scheduleWork(current, expirationTime);272  return expirationTime;273}274export {275  batchedEventUpdates,276  batchedUpdates,277  unbatchedUpdates,278  deferredUpdates,279  syncUpdates,280  discreteUpdates,281  flushDiscreteUpdates,282  flushControlled,283  flushSync,284  flushPassiveEffects,285  IsThisRendererActing,286};287export function getPublicRootInstance(288  container: OpaqueRoot,289): React$Component<any, any> | PublicInstance | null {290  const containerFiber = container.current;291  if (!containerFiber.child) {292    return null;293  }294  switch (containerFiber.child.tag) {295    case HostComponent:296      return getPublicInstance(containerFiber.child.stateNode);297    default:298      return containerFiber.child.stateNode;299  }300}301export function attemptSynchronousHydration(fiber: Fiber): void {302  switch (fiber.tag) {303    case HostRoot:304      let root: FiberRoot = fiber.stateNode;305      if (root.hydrate) {306        // Flush the first scheduled "update".307        flushRoot(root, root.firstPendingTime);308      }309      break;310    case SuspenseComponent:311      flushSync(() => scheduleWork(fiber, Sync));312      // If we're still blocked after this, we need to increase313      // the priority of any promises resolving within this314      // boundary so that they next attempt also has higher pri.315      let retryExpTime = computeInteractiveExpiration(316        requestCurrentTimeForUpdate(),317      );318      markRetryTimeIfNotHydrated(fiber, retryExpTime);319      break;320  }321}322function markRetryTimeImpl(fiber: Fiber, retryTime: ExpirationTime) {323  let suspenseState: null | SuspenseState = fiber.memoizedState;324  if (suspenseState !== null && suspenseState.dehydrated !== null) {325    if (suspenseState.retryTime < retryTime) {326      suspenseState.retryTime = retryTime;327    }328  }329}330// Increases the priority of thennables when they resolve within this boundary.331function markRetryTimeIfNotHydrated(fiber: Fiber, retryTime: ExpirationTime) {332  markRetryTimeImpl(fiber, retryTime);333  let alternate = fiber.alternate;334  if (alternate) {335    markRetryTimeImpl(alternate, retryTime);336  }337}338export function attemptUserBlockingHydration(fiber: Fiber): void {339  if (fiber.tag !== SuspenseComponent) {340    // We ignore HostRoots here because we can't increase341    // their priority and they should not suspend on I/O,342    // since you have to wrap anything that might suspend in343    // Suspense.344    return;345  }346  let expTime = computeInteractiveExpiration(requestCurrentTimeForUpdate());347  scheduleWork(fiber, expTime);348  markRetryTimeIfNotHydrated(fiber, expTime);349}350export function attemptContinuousHydration(fiber: Fiber): void {351  if (fiber.tag !== SuspenseComponent) {352    // We ignore HostRoots here because we can't increase353    // their priority and they should not suspend on I/O,354    // since you have to wrap anything that might suspend in355    // Suspense.356    return;357  }358  let expTime = computeContinuousHydrationExpiration(359    requestCurrentTimeForUpdate(),360  );361  scheduleWork(fiber, expTime);362  markRetryTimeIfNotHydrated(fiber, expTime);363}364export function attemptHydrationAtCurrentPriority(fiber: Fiber): void {365  if (fiber.tag !== SuspenseComponent) {366    // We ignore HostRoots here because we can't increase367    // their priority other than synchronously flush it.368    return;369  }370  const currentTime = requestCurrentTimeForUpdate();371  const expTime = computeExpirationForFiber(currentTime, fiber, null);372  scheduleWork(fiber, expTime);373  markRetryTimeIfNotHydrated(fiber, expTime);374}375export {findHostInstance};376export {findHostInstanceWithWarning};377export function findHostInstanceWithNoPortals(378  fiber: Fiber,379): PublicInstance | null {380  const hostFiber = findCurrentHostFiberWithNoPortals(fiber);381  if (hostFiber === null) {382    return null;383  }384  if (hostFiber.tag === FundamentalComponent) {...

classComponentUpdater.js

Source:classComponentUpdater.js

1const classComponentUpdater = {2  isMounted,3  enqueueSetState(inst, payload, callback) {4    const fiber = getInstance(inst);5    const currentTime = requestCurrentTimeForUpdate();6    const suspenseConfig = requestCurrentSuspenseConfig();7    const expirationTime = computeExpirationForFiber(8      currentTime,9      fiber,10      suspenseConfig,11    );12    const update = createUpdate(expirationTime, suspenseConfig);13    update.payload = payload;14    if (callback !== undefined && callback !== null) {15      update.callback = callback;16    }17    enqueueUpdate(fiber, update);18    scheduleUpdateOnFiber(fiber, expirationTime);19  },20  enqueueReplaceState(inst, payload, callback) {21    const fiber = getInstance(inst);22    const currentTime = requestCurrentTimeForUpdate();23    const suspenseConfig = requestCurrentSuspenseConfig();24    const expirationTime = computeExpirationForFiber(25      currentTime,26      fiber,27      suspenseConfig,28    );29    const update = createUpdate(expirationTime, suspenseConfig);30    update.tag = ReplaceState;31    update.payload = payload;32    if (callback !== undefined && callback !== null) {33      if (__DEV__) {34        warnOnInvalidCallback(callback, 'replaceState');35      }36      update.callback = callback;37    }38    enqueueUpdate(fiber, update);39    scheduleUpdateOnFiber(fiber, expirationTime);40  },41  enqueueForceUpdate(inst, callback) {42    const fiber = getInstance(inst);43    const currentTime = requestCurrentTimeForUpdate();44    const suspenseConfig = requestCurrentSuspenseConfig();45    const expirationTime = computeExpirationForFiber(46      currentTime,47      fiber,48      suspenseConfig,49    );50    const update = createUpdate(expirationTime, suspenseConfig);51    update.tag = ForceUpdate;52    if (callback !== undefined && callback !== null) {53      if (__DEV__) {54        warnOnInvalidCallback(callback, 'forceUpdate');55      }56      update.callback = callback;57    }...

ReactRoot.js

Source:ReactRoot.js

...18    this.finishedWork = null19  }20  render(element) {21    const current = this.current;22    const expirationTime = DOMRenderer.requestCurrentTimeForUpdate();23    // var expirationTime = computeExpirationForFiber(currentTime, current$$1);24    const update = createUpdate(expirationTime);25    // fiber.tagä¸ºHostRootç±»åï¼payloadä¸ºå¯¹åºè¦æ¸²æçReactComponents26    update.payload = {element};27    enqueueUpdate(current, update);28    return DOMRenderer.scheduleUpdateOnFiber(current, expirationTime);29  }...

index.js

Source:index.js

1import {unbatchedUpdates, requestCurrentTimeForUpdate, scheduleUpdateOnFiber} from './ReactFiberWorkLoop';2export {3  unbatchedUpdates,4  scheduleUpdateOnFiber,5  requestCurrentTimeForUpdate...

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 time = await page.evaluate(() => window.playwright._internal.requestCurrentTimeForUpdate());7  console.log(time);8  await browser.close();9})();

Using AI Code Generation

1const {chromium} = require('playwright-chromium');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  await page.evaluate(() => {7    const { requestCurrentTimeForUpdate } = window._playwrightInternal;8    const currentTime = requestCurrentTimeForUpdate();9    console.log(currentTime);10  });11  await browser.close();12})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  await page.evaluate(() => {6    window.requestCurrentTimeForUpdate = function() {7      return new Promise((resolve, reject) => {8        window.requestAnimationFrame(() => {9          resolve(performance.now());10        });11      });12    };13  });14  await page.evaluate(() => {15    window.requestCurrentTimeForUpdate().then((t) => {16      console.log(t);17    });18  });19  await browser.close();20})();21I don’t think this is the correct way of getting the time. The requestAnimationFrame() method is called before every frame is rendered. If you

Using AI Code Generation

1const pw = require('playwright');2const { chromium } = pw;3(async () => {4  const browser = await chromium.launch({headless: false});5  const page = await browser.newPage();6  await page.click('#movie_player > div.html5-video-container > video');7  await page.evaluate(() => {8    window.playwrightInternal.requestCurrentTimeForUpdate();9  });10  await browser.close();11})();

Using AI Code Generation

1const { requestCurrentTimeForUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const [page] = await browser.pages();6  await page.click('text=Get started');7  await page.click('text=Show me the code');8  await page.click('text=Get started');9  await page.click('text=Show me the code');10  await page.click('text=Get started');11  await page.click('text=Show me the code');12  await page.click('text=Get started');13  await page.click('text=Show me the code');14  await page.click('text=Get started');15  await page.click('text=Show me the code');16  await page.click('text=Get started');17  await page.click('text=Show me the code');18  await page.click('text=Get started');19  await page.click('text=Show me the code');20  await page.click('text=Get started');21  await page.click('text=Show me the code');22  await page.click('text=Get started');23  await page.click('text=Show me the code');24  await page.click('text=Get started');25  await page.click('text=Show me the code');26  await page.click('text=Get started');27  await page.click('text=Show me the code');28  await page.click('text=Get started');29  await page.click('text=Show me the code');30  await page.click('text=Get started');31  await page.click('text=Show me the code');32  await page.click('text=Get started');33  await page.click('text=Show me the code');34  await page.click('text=Get started');35  await page.click('text=Show me the code');36  await page.click('text=Get started');37  await page.click('text=Show me the code');38  await page.click('text=Get started');39  await page.click('text=Show me the code');40  await page.click('text=Get started');41  await page.click('text=Show me the code');42  await page.click('text=Get started');43  await page.click('text=Show me the code');44  await page.click('text=Get started');

Using AI Code Generation

1const { requestCurrentTimeForUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement');2const { chromium } = require('playwright');3const browser = await chromium.launch();4const context = await browser.newContext();5const page = await context.newPage();6await requestCurrentTimeForUpdate(page);7await page.close();8await context.close();9await browser.close();10const { chromium } = require('playwright');11const assert = require('assert');12describe('Playwright Internal API', () => {13  it('should work', async () => {14    const browser = await chromium.launch();15    const context = await browser.newContext();16    const page = await context.newPage();17    await page.evaluate(async () => {18      const { requestCurrentTimeForUpdate } = require('playwright/lib/server/supplements/recorder/recorderSupplement');19      await requestCurrentTimeForUpdate(page);20    });21    await page.close();22    await context.close();23    await browser.close();24  });25});

Using AI Code Generation

1const { chromium } = require("playwright");2(async () => {3  const browser = await chromium.launch({4  });5  const context = await browser.newContext();6  const page = await context.newPage();7  const current_time = await page.evaluate(() => {8    return window.playwright.currentTime();9  });10  console.log(current_time);11})();

Using AI Code Generation

1const { requestCurrentTimeForUpdate } = require('playwright/lib/server/chromium/crPage');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const time = await requestCurrentTimeForUpdate(page);6  console.log(time);7  await browser.close();8})();9    at requestCurrentTimeForUpdate (/home/ashish/Downloads/playwright-1.14.1-linux/playwright-1.14.1-linux/node_modules/playwright/lib/server/chromium/crPage.js:13:11)10[1116/143628.498190:FATAL:zygote_host_impl_linux.cc(89)] Check failed: ReceiveFixedMessage(fds[0], kZygoteBootMessage, sizeof(kZygoteBootMessage), &boot_pid). 11#0 0x55d9b2c1ff4f base::debug::CollectStackTrace()12#1 0x55d9b2bd0e8d base::debug::StackTrace::StackTrace()13#2 0x55d9b2bce0c5 logging::LogMessage::~LogMessage()14#3 0x55d9b2bce2b2 logging::LogMessage::~LogMessage()15#4 0x55d9b2c3d3b1 content::ZygoteHostImpl::Init()

Using AI Code Generation

1const { requestCurrentTimeForUpdate } = require('playwright');2(async () => {3  const time = await requestCurrentTimeForUpdate();4  console.log(time);5})();6const { requestCurrentTimeForUpdate } = require('playwright');7(async () => {8  const time = await requestCurrentTimeForUpdate();9  console.log(time);10})();

Using AI Code Generation

1const {chromium} = require('playwright');2const { requestCurrentTimeForUpdate } = require('playwright/lib/server/frames');3const browser = await chromium.launch();4const page = await browser.newPage();5await page.waitForSelector('div#movie_player');6const video = await page.$('div#movie_player');7await video.click();8await video.hover();9await video.focus();10await video.press('Space');

StackOverFlow community discussions

Questions

Discussion

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

Running Playwright in Azure Function

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

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

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

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

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

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

Blogs

Check out the latest blogs from LambdaTest on this topic:

What exactly do Scrum Masters perform throughout the course of a typical day

Many theoretical descriptions explain the role of the Scrum Master as a vital member of the Scrum team. However, these descriptions do not provide an honest answer to the fundamental question: “What are the day-to-day activities of a Scrum Master?”

Why Agile Teams Have to Understand How to Analyze and Make adjustments

How do we acquire knowledge? This is one of the seemingly basic but critical questions you and your team members must ask and consider. We are experts; therefore, we understand why we study and what we should learn. However, many of us do not give enough thought to how we learn.

Project Goal Prioritization in Context of Your Organization’s Strategic Objectives

One of the most important skills for leaders to have is the ability to prioritize. To understand how we can organize all of the tasks that must be completed in order to complete a project, we must first understand the business we are in, particularly the project goals. There might be several project drivers that stimulate project execution and motivate a company to allocate the appropriate funding.

Keeping Quality Transparency Throughout the organization

In general, software testers have a challenging job. Software testing is frequently the final significant activity undertaken prior to actually delivering a product. Since the terms “software” and “late” are nearly synonymous, it is the testers that frequently catch the ire of the whole business as they try to test the software at the end. It is the testers who are under pressure to finish faster and deem the product “release candidate” before they have had enough opportunity to be comfortable. To make matters worse, if bugs are discovered in the product after it has been released, everyone looks to the testers and says, “Why didn’t you spot those bugs?” The testers did not cause the bugs, but they must bear some of the guilt for the bugs that were disclosed.

How to Position Your Team for Success in Estimation

Estimates are critical if you want to be successful with projects. If you begin with a bad estimating approach, the project will almost certainly fail. To produce a much more promising estimate, direct each estimation-process issue toward a repeatable standard process. A smart approach reduces the degree of uncertainty. When dealing with presales phases, having the most precise estimation findings can assist you to deal with the project plan. This also helps the process to function more successfully, especially when faced with tight schedules and the danger of deviation.

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.