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How to use releaseTopLevelCallbackBookKeeping method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactDOMEventListener.js

...24}25export function isEnabled() {26	return _enabled;27}28function releaseTopLevelCallbackBookKeeping(instance) {29	instance.topLevelType = null;30	instance.nativeEvent = null;31	instance.targetInst = null;32	instance.ancestors.length = 0;33	if (callbackBookkeepingPool.length < CALLBACK_BOOKKEEPING_POOL_SIZE) {34		callbackBookkeepingPool.push(instance);35	}36}37function getTopLevelCallbackBookKeeping(topLevelType, nativeEvent, targetInst) {38	if (callbackBookkeepingPool.length) {39		// å¤ç¨40		const instance = callbackBookkeepingPool.pop();41		instance.topLevelType = topLevelType;42		instance.nativeEvent = nativeEvent;43		instance.targetInst = targetInst;44		return instance;45	}46	return {47		topLevelType,48		nativeEvent,49		targetInst,50		ancestors: [],51	};52}53function findRootContainerNode(inst) {54	while (inst.return) {55		inst = inst.return;56	}57	if (inst.tag !== HostRoot) {58		// This can happen if we're in a detached tree.59		return null;60	}61	return inst.stateNode.containerInfo;62}63function handleTopLevel(bookKeeping) {64	let targetInst = bookKeeping.targetInst;65	let ancestor = targetInst;66	do {67		if (!ancestor) {68			const ancestors = bookKeeping.ancestors;69			ancestors.push(ancestor);70			break;71		}72		const root = findRootContainerNode(ancestor);73		if (!root) {74			break;75		}76		bookKeeping.ancestors.push(ancestor);77		ancestor = getClosestInstanceFromNode(root);78	} while (ancestor);79	for (let i = 0; i < bookKeeping.ancestors.length; i++) {80		targetInst = bookKeeping.ancestors[i];81		const eventTarget = getEventTarget(bookKeeping.nativeEvent);82		const topLevelType = bookKeeping.topLevelType;83		const nativeEvent = bookKeeping.nativeEvent;84		runExtractedPluginEventsInBatch(85			topLevelType,86			targetInst,87			nativeEvent,88			eventTarget,89		);90	}91}92function dispatchEventForPluginEventSystem(93	topLevelType,94	eventSystemFlags,95	nativeEvent,96	targetInst,97) {98	const bookKeeping = getTopLevelCallbackBookKeeping(99		topLevelType,100		nativeEvent,101		targetInst,102	);103	try {104		batchedEventUpdates(handleTopLevel, bookKeeping);105	} finally {106		releaseTopLevelCallbackBookKeeping(bookKeeping);107	}108}109function dispatchEvent(topLevelType, eventSystemFlags, nativeEvent) {110	if (!_enabled) {111		return;112	}113	const nativeEventTarget = getEventTarget(nativeEvent);114	let targetInst = getClosestInstanceFromNode(nativeEventTarget);115	dispatchEventForPluginEventSystem(116		topLevelType,117		eventSystemFlags,118		nativeEvent,119		targetInst,120	);...

Using AI Code Generation

1const { Playwright } = require('playwright-core/lib/client/playwright');2const { BrowserContext } = require('playwright-core/lib/server/browserContext');3const { Page } = require('playwright-core/lib/server/page');4const playwright = new Playwright();5const browser = await playwright.chromium.launch();6const context = await browser.newContext();7const page = await context.newPage();8await page.click('[aria-label="Google apps"]');9await page.click('[aria-label="Google apps"]');10await page.click('text=YouTube');11await page.click('[aria-label="Search"]');12await page.click('[aria-label="Search"]');13await page.fill('[aria-label="Search"]', 'playwright');14await page.press('[aria-label="Search"]', 'Enter');15await page.click('text=Playwright: Node.js library to automate Chromium, Firefox and WebKit');16await page.click('text=Playwright: Node.js library to automate Chromium, Firefox and WebKit');17await page.click('text=Playwright: Node.js library to automate Chromium, Firefox and WebKit');18await page.click('text=Playwright: Node.js library to automate Chromium, Firefox and WebKit');19await page.click('text=Playwright: Node.js library to automate Chromium, Firefox and WebKit');20await page.click('text=Playwright: Node.js library to automate Chromium, Firefox and WebKit

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

Running Playwright in Azure Function

firefox browser does not start in playwright

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

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

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

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