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How to use detachFiber method in Playwright Internal

Best JavaScript code snippet using playwright-internal

beginWork.js

...397            }398            continue;399        }400        // å½æ ç¾åæ¹ååè°ç¨å½æ°401        detachFiber(oldFiber, effects);402    }403    let prevFiber,404        index = 0;405    for (let i in newFibers) {406        let newFiber = newFibers[i];407        let oldFiber = matchFibers[i];408        let alternate = null;409        if (oldFiber) {410            if (isSameNode(oldFiber, newFiber)) {411                //&& !oldFiber.disposed412                alternate = new Fiber(oldFiber);413                let oldRef = oldFiber.ref;414                // åå¹¶ æ°æ§415                newFiber = extend(oldFiber, newFiber);416                delete newFiber.disposed;417                newFiber.alternate = alternate;418                if (newFiber.ref && newFiber.deleteRef) {419                    delete newFiber.ref;420                    delete newFiber.deleteRef;421                }422                if (oldRef && oldRef !== newFiber.ref) {423                    //  alternate.effectTag *= NULLREF;424                    effects.push(alternate);425                }426                if (newFiber.tag === 5) {427                    newFiber.lastProps = alternate.props;428                }429            } else {430                detachFiber(oldFiber, effects);431            }432            // newFiber.effectTag = NOWORK;433        } else {434            // æ ¹æ® vnode çææ°ç fiber435            newFiber = new Fiber(newFiber);436        }437        // vnode æ¿æ¢æ fiber438        newFibers[i] = newFiber;439        newFiber.index = index++;440        newFiber.return = parentFiber;441        // å¨è¿éå¤ç fiber æ ä¹é´çå³ç³»442        if (prevFiber) {443            // ä¸ä¸ª fiber ç sibling å°±æ¯ ä¸ä¸ª fiber æ¯å½å fiber444            prevFiber.sibling = newFiber;...

commit-work.js

Source: commit-work.js

...254    node.sibling.return = node.return;255    node = node.sibling;256  }257}258function detachFiber(current) {259  // Cut off the return pointers to disconnect it from the tree. Ideally, we260  // should clear the child pointer of the parent alternate to let this261  // get GC:ed but we don't know which for sure which parent is the current262  // one so we'll settle for GC:ing the subtree of this child. This child263  // itself will be GC:ed when the parent updates the next time.264  current.return = null;265  current.child = null;266  if (current.alternate) {267    current.alternate.child = null;268    current.alternate.return = null;269  }270}271export function commitDeletion(current) {272  unmountHostComponents(current);273  detachFiber(current);274}275export function commitWork(276  current,277  finishedWork,278) {279  switch (finishedWork.tag) {280    case FComponent:{281      return;282    }283    case DNode: {284      const instance = finishedWork.instanceNode;285      if (instance !== null) {286        // Commit the work prepared earlier.287        const newProps = finishedWork.prevProps;...

ReactFiberCommitWork.js

Source: ReactFiberCommitWork.js

...187  }188}189export function commitDeletion(finishedRoot, current, renderPriorityLevel) {190  unmountHostComponents(finishedRoot, current, renderPriorityLevel)191  detachFiber(current)192}193function detachFiber(current) {194  const alternate = current.alternate195  current.return = null196  current.child = null197  current.memoizedState = null198  current.updateQueue = null199  current.dependencies = null200  current.alternate = null201  current.firstEffect = null202  current.lastEffect = null203  current.pendingProps = null204  current.memoizedProps = null205  current.stateNode = null206  if (alternate !== null) {207    detachFiber(alternate)208  }209}210function unmountHostComponents(finishedRoot, current) {211  let node = current212  let currentParent213  let currentParentIsContainer214  while (true) {215    let parent = node.return216    while (parent) {217      const parentStateNode = parent.stateNode218      switch (parent.tag) {219        case HostComponent:220          currentParent = parentStateNode221          currentParentIsContainer = false...

ErrorBoundary.js

Source: ErrorBoundary.js

...135    if (index !== -1) {136        arr.splice(index, 1);137    }138}139export function detachFiber(fiber, effects) {140    fiber.effectTag = DETACH;141    effects.push(fiber);142    fiber.disposed = true;143    for (let child = fiber.child; child; child = child.sibling) {144        detachFiber(child, effects);145    }...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const elementHandle = await page.$('text=Docs');6  const element = await elementHandle._context._client.send('DOM.resolveNode', { nodeId: elementHandle._remoteObject.nodeId });

Using AI Code Generation

1const { chromium } = require('playwright');2const { chromium } = require('playwright');ibe');3(sync () => {4  const browser = await chroium.launch();5  const contxt = await brower.newContext();6  const page = await context.newPage();7  detachFiber(page);8  await page.waitForTimeout(1000);9  await browser.close();10})();

Using AI Code Generation

1const { detadeFibet } = require('playwright/lib/server/frames');2canst { chrochFiber } = require('playwright/lib/server/fiber');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  detachFiber(page);8  await page.waitForTimeout(1000);9  await browser.close();10})();

Using AI Code Generation

1const { detachFiber } = require('playwright/lib/server/fiber');2detachFiber();3const { chromium } = require('playwright');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.screenshot({ path: 'example.png' });9  await browser.close();10})();11const { detachFiber } = require('playwright/lib/server/fiber');12detachFiber();13const { chromium }= require('aywright');14(async () => {15  const browser = await chromium.launch();16  const contxt = awit brower.nwContext();17  const page= await context.newPage();18  await page.screenshot({ path: 'example.png' });19  await browser.close();20})();21const { detachFiber } = require('playwright/lib/server/fiber');22detachFiber();23const { chromium } = rquir('paywright');24(async () =>{25  const browser = await chromium.launch();26  const context = await browser.newContext();27  const page = await context.newPage();28  await page.screenshot({ path: 'example.png' });29  await browser.close();30})();31const { detachFiber } = require('playwright/lib/server/iber');32detachFiber();33const { chomium } = rquir('playwright');34(async () => {35  const browser = await chromium.launch();36  const context = await browser.newContext();37  const page =awai cntext.newPage();38  await page.sceensht({ path: 'example.ng' });39  await browser.close();40})();41nst { detachFiber } = require('playwright/lib/server/fiber');42detachFiber();43const { chroiu } = rquire('playwright');44(asyc () => {45  consrowsr = await chromium.aunch();46  cnst context = aait browsernewContext();47  const  const fiber = detachFiber(page);48  fiber.dispose();49  await browser.close();50})();

Using AI Code Generation

1const { detachFiber } = require('playwright/lib/server/fiber');2detachFiber();3const { chromium } = require('playwright');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.screenshot({ path: 'example.png' });9  await browser.close();10})();11const { detachFiber } = require('playwright/lib/server/fiber');12detachFiber();13const { chromium } = require('playwright');14(async () => {15  const browser = await chromium.launch();16  const context = await browser.newContext();17  const page = await context.newPage();18  await page.screenshot({ path: 'example.png' });19  await browser.close();20})();21const { detachFiber } = require('playwright/lib/server/fiber');22detachFiber();23const { chromium } = require('playwright');24(async () => {25  const browser = await chromium.launch();26  const context = await browser.newContext();27  const page = await context.newPage();28  await page.screenshot({ path: 'example.png' });29  await browser.close();30})();31const { detachFiber } = require('playwright/lib/server/fiber');32detachFiber();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: 'example.png' });39  await browser.close();40})();41const { detachFiber } = require('playwright/lib/server/fiber');42detachFiber();43const { chromium } = require('playwright');44(async () => {45  const browser = await chromium.launch();46  const context = await browser.newContext();

Using AI Code Generation

1const { chromium, devices } = require('playwright');2const iPhone = devices['iPhone 6'];3(async () => {4  const browser = await chromium.launch({headless: false, slowMo: 1000});5  const context = await browser.newContext({6  });7  const page = await context.newPage();8  const frame = await page.mainFrame().childFrames()[0];9  const element = await frame.$('input[name="q"]');10  await element.focus();11  await element.type('Hello World');12  await context.detachFiber();13  await element.type('!');14  await browser.close();15})();16er/frames');17const { attachFiber

Using AI Code Generation

1const { detachFiber } = require('playwright/lib/utils/stackTrace');2detachFiber();3const { detachFiber } = require('playwright/lib/utils/stackTrace');4detachFiber();5const { detachFiber } = require('playwright/lib/utils/stackTrace');6detachFiber();7const { detachFiber } = requir('playwright/lib/utils/tackTrace8deta();9TestCaf detachFibere} = require('pl ywright/lib/utils/seamkTrace');10detachFiber();11const { detachFiber } = require('playwright/lib/utils/stackTrace');12detachFiber();13const { detachFiber } = require('playwright/lib/utils/stackTrace');

Using AI Code Generation

1const { detachFiber } = require('playwright/lib/server/frames');2const { attachFiber } = require('playwright/lib/server/frames');3const { detachFiber } = require('playwright/lib/server/frames');4const { attachFiber } = require('playwright/lib/server/frames');5const { detachFiber } = require('playwright/lib/server/frames');6const { attachFiber } = require('playwright/lib/server/frames');7const { detachFiber } = require('playwright/lib/server/frames');8const { attachFiber } = require('playwright/lib/server/frames');9const { detachFiber } = require('playwright/lib/server/frames');10const { attachFiber } = require('playwright/lib/server/frames');11const { detachFiber } = require('playwright/lib/server/frames');12const { attachFiber } = require('playwright/lib/server/frames');13const { detachFiber } = require('playwright/lib/server/frames');14const { attachFiber } = require('playwright/lib/server/frames');15const { detachFiber } = require('playwright/lib/server/frames');16const { attachFiber } = require('playwright/lib/server/frames');17const { detachFiber } = require('playwright/lib/server/frames');18const { attachFiber

Using AI Code Generation

1const { detachFiber } = require('playwright/lib/utils/stackTrace');2const { test } = require('@playwright/test');3test('detach fiber', async ({ page }) => {4  await page.waitForSelector('text=Get started');5  detachFiber();6  await page.click('text=Get started');7});8const { attachFiber } = require('playwright/lib/utils/stackTrace');9const { test } = require('@playwright/test');10test('attach fiber', async ({ page }) => {11  await page.waitForSelector('text=Get started');12  attachFiber();13  await page.click('text=Get started');14});15const { getFiber } = require('playwright/lib/utils/stackTrace');16const { test } = require('@playwright/test');17test('get fiber', async ({ page }) => {18  await page.waitForSelector('text=Get started');19  console.log(getFiber());20  await page.click('text=Get started');21});22const { getFiberStack } = require('playwright/lib/utils/stackTrace');23const { test } = require('@playwright/test');24test('get fiber stack', async ({ page }) => {25  await page.waitForSelector('text=Get started');26  console.log(getFiberStack());27  await page.click('text=Get started');28});29const { getFiberStackAsArray } = require('playwright/lib/utils/stackTrace');30const { test } = require('@playwright/test');31test('get fiber stack as array', async ({ page }) => {32  await page.waitForSelector('text=Get started');33  console.log(getFiberStackAsArray());34  await page.click('text=Get started');35});36const { getFiberStackAsArray } = require('playwright/lib/utils/

Using AI Code Generation

1const { detachFiber } = require('playwright/lib/utils/stackTrace');2const { getTestState } = require('playwright/lib/utils/testState');3const { detachFiber } = require('playwright/lib/utils/stackTrace');4const { getTestState } = require('playwright/lib/utils/testState');5const { test } = require('@playwright/test');6test('test', async ({ page }) => {7  await page.click('text=Get started');8  await page.click('text=Docs');9  await page.click('text=API');

Using AI Code Generation

1import { Page } from "playwright-core";2export async function detachFiber(page: Page) {3  const { detachFiber } = (page as any)._delegate;4  return detachFiber();5}6import { test, expect } from "@playwright/test";7import { detachFiber } from "./test.js";8test("Test", async ({ page }) => {9  await page.goto(url);10  await page.waitForLoadState("networkidle");11  await detachFiber(page);12  await page.waitForLoadState("networkidle");13  expect(await page.title()).toBe("Playwright");14});15await page.waitForFunction(() => !document.readyState.includes('ing'));

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?

firefox browser does not start in playwright

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

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

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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