KaneAI - World’s First E2E Software Testing Agent.Signup for Private Beta Join TestMu Conference

How to use getFirstHydratableChild method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberHydrationContext.new.js

Source:ReactFiberHydrationContext.new.js

...52  if (!supportsHydration) {53    return false;54  }55  const parentInstance = fiber.stateNode.containerInfo;56  nextHydratableInstance = getFirstHydratableChild(parentInstance);57  hydrationParentFiber = fiber;58  isHydrating = true;59  return true;60}61function reenterHydrationStateFromDehydratedSuspenseInstance(62  fiber: Fiber,63  suspenseInstance: SuspenseInstance,64): boolean {65  if (!supportsHydration) {66    return false;67  }68  nextHydratableInstance = getNextHydratableSibling(suspenseInstance);69  popToNextHostParent(fiber);70  isHydrating = true;71  return true;72}73function deleteHydratableInstance(74  returnFiber: Fiber,75  instance: HydratableInstance,76) {77  const childToDelete = createFiberFromHostInstanceForDeletion();78  childToDelete.stateNode = instance;79  childToDelete.return = returnFiber;80  const deletions = returnFiber.deletions;81  if (deletions === null) {82    returnFiber.deletions = [childToDelete];83    // TODO (effects) Rename this to better reflect its new usage (e.g. ChildDeletions)84    returnFiber.flags |= Deletion;85  } else {86    deletions.push(childToDelete);87  }88}89function insertNonHydratedInstance(returnFiber: Fiber, fiber: Fiber) {90  fiber.flags = (fiber.flags & ~Hydrating) | Placement;91}92function tryHydrate(fiber, nextInstance) {93  switch (fiber.tag) {94    case HostComponent: {95      const type = fiber.type;96      const props = fiber.pendingProps;97      const instance = canHydrateInstance(nextInstance, type, props);98      if (instance !== null) {99        fiber.stateNode = (instance: Instance);100        return true;101      }102      return false;103    }104    case HostText: {105      const text = fiber.pendingProps;106      const textInstance = canHydrateTextInstance(nextInstance, text);107      if (textInstance !== null) {108        fiber.stateNode = (textInstance: TextInstance);109        return true;110      }111      return false;112    }113    case SuspenseComponent: {114      if (enableSuspenseServerRenderer) {115        const suspenseInstance: null | SuspenseInstance = canHydrateSuspenseInstance(116          nextInstance,117        );118        if (suspenseInstance !== null) {119          const suspenseState: SuspenseState = {120            dehydrated: suspenseInstance,121            retryLane: OffscreenLane,122          };123          fiber.memoizedState = suspenseState;124          // Store the dehydrated fragment as a child fiber.125          // This simplifies the code for getHostSibling and deleting nodes,126          // since it doesn't have to consider all Suspense boundaries and127          // check if they're dehydrated ones or not.128          const dehydratedFragment = createFiberFromDehydratedFragment(129            suspenseInstance,130          );131          dehydratedFragment.return = fiber;132          fiber.child = dehydratedFragment;133          return true;134        }135      }136      return false;137    }138    default:139      return false;140  }141}142function tryToClaimNextHydratableInstance(fiber: Fiber): void {143  if (!isHydrating) {144    return;145  }146  let nextInstance = nextHydratableInstance;147  if (!nextInstance) {148    // Nothing to hydrate. Make it an insertion.149    insertNonHydratedInstance((hydrationParentFiber: any), fiber);150    isHydrating = false;151    hydrationParentFiber = fiber;152    return;153  }154  const firstAttemptedInstance = nextInstance;155  if (!tryHydrate(fiber, nextInstance)) {156    // If we can't hydrate this instance let's try the next one.157    // We use this as a heuristic. It's based on intuition and not data so it158    // might be flawed or unnecessary.159    nextInstance = getNextHydratableSibling(firstAttemptedInstance);160    if (!nextInstance || !tryHydrate(fiber, nextInstance)) {161      // Nothing to hydrate. Make it an insertion.162      insertNonHydratedInstance((hydrationParentFiber: any), fiber);163      isHydrating = false;164      hydrationParentFiber = fiber;165      return;166    }167    // We matched the next one, we'll now assume that the first one was168    // superfluous and we'll delete it. Since we can't eagerly delete it169    // we'll have to schedule a deletion. To do that, this node needs a dummy170    // fiber associated with it.171    deleteHydratableInstance(172      (hydrationParentFiber: any),173      firstAttemptedInstance,174    );175  }176  hydrationParentFiber = fiber;177  nextHydratableInstance = getFirstHydratableChild((nextInstance: any));178}179function prepareToHydrateHostInstance(180  fiber: Fiber,181  rootContainerInstance: Container,182  hostContext: HostContext,183): boolean {184  if (!supportsHydration) {185    invariant(186      false,187      'Expected prepareToHydrateHostInstance() to never be called. ' +188        'This error is likely caused by a bug in React. Please file an issue.',189    );190  }191  const instance: Instance = fiber.stateNode;...

ReactFiberHydrationContext.js

Source:ReactFiberHydrationContext.js

...20	if (!supportsHydration) {21		return false;22	}23	const parentInstance = fiber.stateNode.containerInfo;24	nextHydratableInstance = getFirstHydratableChild(parentInstance);25	hydrationParentFiber = fiber;26	isHydrating = true;27	return true;28}29function deleteHydratableInstance(returnFiber, instance) {30	const childToDelete = createFiberFromHostInstanceForDeletion();31	childToDelete.stateNode = instance;32	childToDelete.return = returnFiber;33	childToDelete.effectTag = Deletion;34	// This might seem like it belongs on progressedFirstDeletion. However,35	// these children are not part of the reconciliation list of children.36	// Even if we abort and rereconcile the children, that will try to hydrate37	// again and the nodes are still in the host tree so these will be38	// recreated.39	if (returnFiber.lastEffect !== null) {40		returnFiber.lastEffect.nextEffect = childToDelete;41		returnFiber.lastEffect = childToDelete;42	} else {43		returnFiber.firstEffect = returnFiber.lastEffect = childToDelete;44	}45}46function insertNonHydratedInstance(returnFiber, fiber) {47	fiber.effectTag |= Placement;48}49function tryHydrate(fiber, nextInstance) {50	switch (fiber.tag) {51		case HostComponent: {52			const type = fiber.type;53			const props = fiber.pendingProps;54			const instance = canHydrateInstance(nextInstance, type, props);55			if (instance !== null) {56				fiber.stateNode = instance;57				return true;58			}59			return false;60		}61		case HostText: {62			const text = fiber.pendingProps;63			const textInstance = canHydrateTextInstance(nextInstance, text);64			if (textInstance !== null) {65				fiber.stateNode = textInstance;66				return true;67			}68			return false;69		}70		default:71			return false;72	}73}74function tryToClaimNextHydratableInstance(fiber) {75	if (!isHydrating) {76		return;77	}78	let nextInstance = nextHydratableInstance;79	if (!nextInstance) {80		// Nothing to hydrate. Make it an insertion.81		insertNonHydratedInstance((hydrationParentFiber: any), fiber);82		isHydrating = false;83		hydrationParentFiber = fiber;84		return;85	}86	const firstAttemptedInstance = nextInstance;87	if (!tryHydrate(fiber, nextInstance)) {88		// If we can't hydrate this instance let's try the next one.89		// We use this as a heuristic. It's based on intuition and not data so it90		// might be flawed or unnecessary.91		nextInstance = getNextHydratableSibling(firstAttemptedInstance);92		if (!nextInstance || !tryHydrate(fiber, nextInstance)) {93			// Nothing to hydrate. Make it an insertion.94			insertNonHydratedInstance((hydrationParentFiber), fiber);95			isHydrating = false;96			hydrationParentFiber = fiber;97			return;98		}99		// We matched the next one, we'll now assume that the first one was100		// superfluous and we'll delete it. Since we can't eagerly delete it101		// we'll have to schedule a deletion. To do that, this node needs a dummy102		// fiber associated with it.103		deleteHydratableInstance((hydrationParentFiber), firstAttemptedInstance);104	}105	hydrationParentFiber = fiber;106	nextHydratableInstance = getFirstHydratableChild((nextInstance));107}108function prepareToHydrateHostInstance(fiber, rootContainerInstance, hostContext) {109	const instance = fiber.stateNode;110	const updatePayload = hydrateInstance(111		instance,112		fiber.type,113		fiber.memoizedProps,114		rootContainerInstance,115		hostContext,116		fiber117	);118	// TODO: Type this specific to this type of component.119	fiber.updateQueue = (updatePayload);120	// If the update payload indicates that there is a change or if there...

HostConfigWithNoHydration.js

Source:HostConfigWithNoHydration.js

1/**2 * Copyright (c) Facebook, Inc. and its affiliates.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of the React source tree.6 *7 * @flow8 */9import invariant from 'invariant';10// Renderers that don't support hydration11// can re-export everything from this module.12function shim(...args: any) {13  invariant(14    false,15    'The current renderer does not support hydration. ' +16      'This error is likely caused by a bug in React. ' +17      'Please file an issue.',18  );19}20// Hydration (when unsupported)21export type SuspenseInstance = mixed;22export const supportsHydration = false;23export const canHydrateInstance = shim;24export const canHydrateTextInstance = shim;25export const canHydrateSuspenseInstance = shim;26export const isSuspenseInstancePending = shim;27export const isSuspenseInstanceFallback = shim;28export const registerSuspenseInstanceRetry = shim;29export const getNextHydratableSibling = shim;30export const getFirstHydratableChild = shim;31export const hydrateInstance = shim;32export const hydrateTextInstance = shim;33export const getNextHydratableInstanceAfterSuspenseInstance = shim;34export const clearSuspenseBoundary = shim;35export const clearSuspenseBoundaryFromContainer = shim;36export const didNotMatchHydratedContainerTextInstance = shim;37export const didNotMatchHydratedTextInstance = shim;38export const didNotHydrateContainerInstance = shim;39export const didNotHydrateInstance = shim;40export const didNotFindHydratableContainerInstance = shim;41export const didNotFindHydratableContainerTextInstance = shim;42export const didNotFindHydratableContainerSuspenseInstance = shim;43export const didNotFindHydratableInstance = shim;44export const didNotFindHydratableTextInstance = shim;...

hydrations.js

Source:hydrations.js

1import { emptyFnc } from '../utils';2export const canHydrateInstance = emptyFnc('canHydrateInstance');3export const canHydrateTextInstance = emptyFnc('canHydrateTextInstance');4export const getNextHydratableSibling = emptyFnc('getNextHydratableSibling');5export const getFirstHydratableChild = emptyFnc('getFirstHydratableChild');6export const hydrateInstance = emptyFnc('hydrateInstance');7export const hydrateTextInstance = emptyFnc('hydrateTextInstance');8export const didNotMatchHydratedContainerTextInstance = emptyFnc('didNotMatchHydratedContainerTextInstance');9export const didNotMatchHydratedTextInstance = emptyFnc('didNotMatchHydratedTextInstance');10export const didNotHydrateContainerInstance = emptyFnc('didNotHydrateContainerInstance');11export const didNotHydrateInstance = emptyFnc('didNotHydrateInstance');12export const didNotFindHydratableContainerInstance = emptyFnc('didNotFindHydratableContainerInstance');13export const didNotFindHydratableContainerTextInstance = emptyFnc('didNotFindHydratableContainerTextInstance');14export const didNotFindHydratableInstance = emptyFnc('didNotFindHydratableInstance');...

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 elementHandle = page._delegate.getFirstHydratableChild();7  console.log(elementHandle);8  await browser.close();9})();

Using AI Code Generation

1const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');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 element = await page.$('body');8  const firstHydratableChild = await getFirstHydratableChild(element);9  console.log(firstHydratableChild);10  await browser.close();11})();

Using AI Code Generation

1const { getFirstHydratableChild } = require('@playwright/test/lib/server/dom');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  await page.setContent(`<div id="parent">8  </div>`);9  const parent = await page.$('#parent');10  const child1 = await page.$('#child1');11  const child2 = await page.$('#child2');12  const firstHydratableChild = await getFirstHydratableChild(parent);13  console.log(firstHydratableChild._element);14  await browser.close();15})();

Using AI Code Generation

1const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');2const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');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 { getFirstHydratableChild } = require('playwright/lib/server/dom.js');12const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');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 { getFirstHydratableChild } = require('playwright/lib/server/dom.js');22const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');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 { getFirstHydratableChild } = require('playwright/lib/server/dom.js');32const { getFirstHydratableChild } = require('playwright/lib/server/dom

Using AI Code Generation

1const { getFirstHydratableChild } = require('@playwright/test/lib/server/domSnapshot');2const { createPage } = require('@playwright/test/lib/server/page');3const { createFrame } = require('@playwright/test/lib/server/frames');4const { createExecutionContext } = require('@playwright/test/lib/server/frames');5const { createJSHandle } = require('@playwright/test/lib/server/jsHandle');6const { createElementHandle } = require('@playwright/test/lib/server/elementHandler');7const { createJSHandleDispatcher } = require('@playwright/test/lib/server/dispatchers/jsHandleDispatcher');8const { createElementHandleDispatcher } = require('@playwright/test/lib/server/dispatchers/elementHandleDispatcher');9const { createRootDispatcher } = require('@playwright/test/lib/server/dispatchers/elementHandleDispatcher');10const page = createPage();11const frame = createFrame(page, 'frameId', 'frameUrl');12const context = createExecutionContext(frame);13const jsHandle = createJSHandle(context, 'object', 'objectId');14const elementHandle = createElementHandle(context, 'element', 'elementId');15const jsHandleDispatcher = createJSHandleDispatcher(jsHandle);16const elementHandleDispatcher = createElementHandleDispatcher(elementHandle);17const rootDispatcher = createRootDispatcher(page);18(async () => {19  const result = await getFirstHydratableChild(rootDispatcher);20  console.log(result);21})();22const firstChild = await page.$('body > *:first-child')23const firstChild = await page.$('body > *:first-child')24const firstChild = await page.$('body > *:first-child')

Using AI Code Generation

1const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');2const { dom } = require('playwright/lib/server/dom.js');3const { parse } = require('playwright/lib/server/parse5.js');4const { createTestServer } = require('playwright/lib/utils/testserver/');5const { test } = require('playwright/lib/utils/testrunner/');6const { expect } = require('playwright/lib/utils/testrunner/');7const { createTestState } = require('playwright/lib/utils/testrunner/');8const { createTestFixtures } = require('playwright/lib/utils/testrunner/');9const { createTestFixture } = require('playwright/lib/utils/testrunner/');10const { createTestWorker } = require('playwright/lib/utils/testrunner/');11test('should return first hydratable child', async () => {12  const { page } = await createTestState();13  await page.setContent(`14  `);15  const container = page.locator('#container');16  let firstChild = await getFirstHydratableChild(container);17  expect(firstChild).toBe('1');18  await page.evaluate(() => {19    const container = document.querySelector('#container');20    container.removeChild(container.firstChild);21  });22  firstChild = await getFirstHydratableChild(container);23  expect(firstChild).toBe('2');24});25test('should return first hydratable child with text content', async () => {26  const { page } = await createTestState();27  await page.setContent(`28  `);29  const container = page.locator('#container');30  const firstChild = await getFirstHydratableChild(container);31  expect(firstChild).toBe('1');32});33test('should return first hydratable child with text content and element', async () => {34  const { page } = await createTestState();35  await page.setContent(`36  `);37  const container = page.locator('#container');38  await page.evaluate(() =>

Using AI Code Generation

1const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');2const { chromium } = require('playwright');3(async () => {4const browser = await chromium.launch();5const context = await browser.newContext();6const page = await context.newPage();7const elementHandle = await page.$('html');8const firstChild = await getFirstHydratableChild(elementHandle);9console.log(firstChild);10await browser.close();11})();12ElementHandle {13  _channel: Connection {14    _events: [Object: null prototype] {},15    _callbacks: Map(0) {},16    _objects: Map(2) { [Object], [Object] },17    _sessions: Map(1) { [Object] => [Object] },18    _pendingSessions: Map(0) {},19  },20  _initializer: {21    objectId: '{"injectedScriptId":1,"id":1}',22    preview: {23    }24  },25  _context: BrowserContext {26  },

Using AI Code Generation

1const { getFirstHydratableChild } = require('playwright/lib/server/dom.js');2const { parse } = require('playwright/lib/server/common/html.js');3`;4const dom = parse(html);5const firstChild = getFirstHydratableChild(dom, dom);6console.log(firstChild);

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.