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How to use flattenSingleChildIntoContext method in Playwright Internal

Best JavaScript code snippet using playwright-internal

flattenStackChildren.js

...32 * @param {?ReactComponent} child React child component.33 * @param {!string} name String name of key path to child.34 * @param {number=} selfDebugID Optional debugID of the current internal instance.35 */36function flattenSingleChildIntoContext(37  traverseContext: mixed,38  child: ReactElement<any>,39  name: string,40  selfDebugID?: number,41): void {42  // We found a component instance.43  if (traverseContext && typeof traverseContext === 'object') {44    const result = traverseContext;45    const keyUnique = result[name] === undefined;46    if (__DEV__) {47      if (!ReactComponentTreeHook) {48        ReactComponentTreeHook = require('ReactGlobalSharedState')49          .ReactComponentTreeHook;50      }51      if (!keyUnique) {52        warning(53          false,54          'flattenChildren(...): Encountered two children with the same key, ' +55            '`%s`. Child keys must be unique; when two children share a key, only ' +56            'the first child will be used.%s',57          KeyEscapeUtils.unescape(name),58          ReactComponentTreeHook.getStackAddendumByID(selfDebugID),59        );60      }61    }62    if (keyUnique && child != null) {63      result[name] = child;64    }65  }66}67/**68 * Flattens children that are typically specified as `props.children`. Any null69 * children will not be included in the resulting object.70 * @return {!object} flattened children keyed by name.71 */72function flattenStackChildren(73  children: ReactElement<any>,74  selfDebugID?: number,75): ?{[name: string]: ReactElement<any>} {76  if (children == null) {77    return children;78  }79  var result = {};80  if (__DEV__) {81    traverseStackChildren(82      children,83      (traverseContext, child, name) =>84        flattenSingleChildIntoContext(85          traverseContext,86          child,87          name,88          selfDebugID,89        ),90      result,91    );92  } else {93    traverseStackChildren(children, flattenSingleChildIntoContext, result);94  }95  return result;96}...

flattenChildren.js

Source: flattenChildren.js

...7  var ReactComponentTreeHook;8  if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {9    ReactComponentTreeHook = require('./ReactComponentTreeHook');10  }11  function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {12    if (traverseContext && typeof traverseContext === 'object') {13      var result = traverseContext;14      var keyUnique = result[name] === undefined;15      if (process.env.NODE_ENV !== 'production') {16        if (!ReactComponentTreeHook) {17          ReactComponentTreeHook = require('./ReactComponentTreeHook');18        }19        if (!keyUnique) {20          process.env.NODE_ENV !== 'production' ? warning(false, 'flattenChildren(...): Encountered two children with the same key, ' + '`%s`. Child keys must be unique; when two children share a key, only ' + 'the first child will be used.%s', KeyEscapeUtils.unescape(name), ReactComponentTreeHook.getStackAddendumByID(selfDebugID)) : void 0;21        }22      }23      if (keyUnique && child != null) {24        result[name] = child;25      }26    }27  }28  function flattenChildren(children, selfDebugID) {29    if (children == null) {30      return children;31    }32    var result = {};33    if (process.env.NODE_ENV !== 'production') {34      traverseAllChildren(children, function(traverseContext, child, name) {35        return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);36      }, result);37    } else {38      traverseAllChildren(children, flattenSingleChildIntoContext, result);39    }40    return result;41  }42  module.exports = flattenChildren;...

86a3cd774b2b2447a30df028845ae03ef4150dflattenChildren.js

Source: 86a3cd774b2b2447a30df028845ae03ef4150dflattenChildren.js

...5var ReactComponentTreeHook;6if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {7  ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');8}9function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {10  if (traverseContext && typeof traverseContext === 'object') {11    var result = traverseContext;12    var keyUnique = result[name] === undefined;13    if (__DEV__) {14      if (!ReactComponentTreeHook) {15        ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');16      }17      if (!keyUnique) {18        warning(false, 'flattenChildren(...): Encountered two children with the same key, ' + '`%s`. Child keys must be unique; when two children share a key, only ' + 'the first child will be used.%s', KeyEscapeUtils.unescape(name), ReactComponentTreeHook.getStackAddendumByID(selfDebugID));19      }20    }21    if (keyUnique && child != null) {22      result[name] = child;23    }24  }25}26function flattenChildren(children, selfDebugID) {27  if (children == null) {28    return children;29  }30  var result = {};31  if (__DEV__) {32    traverseAllChildren(children, function (traverseContext, child, name) {33      return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);34    }, result);35  } else {36    traverseAllChildren(children, flattenSingleChildIntoContext, result);37  }38  return result;39}...

3ca162flattenChildren.js

Source: 3ca162flattenChildren.js

...5var ReactComponentTreeHook;6if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {7  ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');8}9function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {10  if (traverseContext && typeof traverseContext === 'object') {11    var result = traverseContext;12    var keyUnique = result[name] === undefined;13    if (__DEV__) {14      if (!ReactComponentTreeHook) {15        ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');16      }17      if (!keyUnique) {18        warning(false, 'flattenChildren(...): Encountered two children with the same key, ' + '`%s`. Child keys must be unique; when two children share a key, only ' + 'the first child will be used.%s', KeyEscapeUtils.unescape(name), ReactComponentTreeHook.getStackAddendumByID(selfDebugID));19      }20    }21    if (keyUnique && child != null) {22      result[name] = child;23    }24  }25}26function flattenChildren(children, selfDebugID) {27  if (children == null) {28    return children;29  }30  var result = {};31  if (__DEV__) {32    traverseAllChildren(children, function (traverseContext, child, name) {33      return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);34    }, result);35  } else {36    traverseAllChildren(children, flattenSingleChildIntoContext, result);37  }38  return result;39}...

418d3dflattenChildren.js

Source: 418d3dflattenChildren.js

...5var ReactComponentTreeHook;6if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {7  ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');8}9function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {10  if (traverseContext && typeof traverseContext === 'object') {11    var result = traverseContext;12    var keyUnique = result[name] === undefined;13    if (__DEV__) {14      if (!ReactComponentTreeHook) {15        ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');16      }17      if (!keyUnique) {18        warning(false, 'flattenChildren(...): Encountered two children with the same key, ' + '`%s`. Child keys must be unique; when two children share a key, only ' + 'the first child will be used.%s', KeyEscapeUtils.unescape(name), ReactComponentTreeHook.getStackAddendumByID(selfDebugID));19      }20    }21    if (keyUnique && child != null) {22      result[name] = child;23    }24  }25}26function flattenChildren(children, selfDebugID) {27  if (children == null) {28    return children;29  }30  var result = {};31  if (__DEV__) {32    traverseAllChildren(children, function (traverseContext, child, name) {33      return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);34    }, result);35  } else {36    traverseAllChildren(children, flattenSingleChildIntoContext, result);37  }38  return result;39}...

727692flattenChildren.js

Source: 727692flattenChildren.js

...5var ReactComponentTreeHook;6if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {7  ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');8}9function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {10  if (traverseContext && typeof traverseContext === 'object') {11    var result = traverseContext;12    var keyUnique = result[name] === undefined;13    if (__DEV__) {14      if (!ReactComponentTreeHook) {15        ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');16      }17      if (!keyUnique) {18        warning(false, 'flattenChildren(...): Encountered two children with the same key, ' + '`%s`. Child keys must be unique; when two children share a key, only ' + 'the first child will be used.%s', KeyEscapeUtils.unescape(name), ReactComponentTreeHook.getStackAddendumByID(selfDebugID));19      }20    }21    if (keyUnique && child != null) {22      result[name] = child;23    }24  }25}26function flattenChildren(children, selfDebugID) {27  if (children == null) {28    return children;29  }30  var result = {};31  if (__DEV__) {32    traverseAllChildren(children, function (traverseContext, child, name) {33      return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);34    }, result);35  } else {36    traverseAllChildren(children, flattenSingleChildIntoContext, result);37  }38  return result;39}...

4dfe17flattenChildren.js

Source: 4dfe17flattenChildren.js

...9process.env.NODE_ENV==='test')10{11ReactComponentTreeHook=require('react/lib/ReactComponentTreeHook');12}13function flattenSingleChildIntoContext(14traverseContext,15child,16name,17selfDebugID)18{19if(traverseContext&&typeof traverseContext==='object'){20var result=traverseContext;21var keyUnique=result[name]===undefined;22if(__DEV__){23if(!ReactComponentTreeHook){24ReactComponentTreeHook=require('react/lib/ReactComponentTreeHook');25}26if(!keyUnique){27warning(28false,29'flattenChildren(...): Encountered two children with the same key, '+30'`%s`. Child keys must be unique; when two children share a key, only '+31'the first child will be used.%s',32KeyEscapeUtils.unescape(name),33ReactComponentTreeHook.getStackAddendumByID(selfDebugID));34}35}36if(keyUnique&&child!=null){37result[name]=child;38}39}40}41function flattenChildren(42children,43selfDebugID)44{45if(children==null){46return children;47}48var result={};49if(__DEV__){50traverseAllChildren(51children,52function(traverseContext,child,name){return flattenSingleChildIntoContext(53traverseContext,54child,55name,56selfDebugID);},57result);58}else{59traverseAllChildren(children,flattenSingleChildIntoContext,result);60}61return result;62}...

062b21flattenChildren.js

Source: 062b21flattenChildren.js

...9process.env.NODE_ENV==='test')10{11ReactComponentTreeHook=require('react/lib/ReactComponentTreeHook');12}13function flattenSingleChildIntoContext(14traverseContext,15child,16name,17selfDebugID)18{19if(traverseContext&&typeof traverseContext==='object'){20var result=traverseContext;21var keyUnique=result[name]===undefined;22if(__DEV__){23if(!ReactComponentTreeHook){24ReactComponentTreeHook=require('react/lib/ReactComponentTreeHook');25}26if(!keyUnique){27warning(28false,29'flattenChildren(...): Encountered two children with the same key, '+30'`%s`. Child keys must be unique; when two children share a key, only '+31'the first child will be used.%s',32KeyEscapeUtils.unescape(name),33ReactComponentTreeHook.getStackAddendumByID(selfDebugID));34}35}36if(keyUnique&&child!=null){37result[name]=child;38}39}40}41function flattenChildren(42children,43selfDebugID)44{45if(children==null){46return children;47}48var result={};49if(__DEV__){50traverseAllChildren(51children,52function(traverseContext,child,name){return flattenSingleChildIntoContext(53traverseContext,54child,55name,56selfDebugID);},57result);58}else{59traverseAllChildren(children,flattenSingleChildIntoContext,result);60}61return result;62}...

Using AI Code Generation

1const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');2const { Frame } = require('playwright/lib/server/frames');3const { ElementHandle } = require('playwright/lib/server/dom');4const frame = new Frame();5const elementHandle = new ElementHandle();6flattenSingleChildIntoContext(frame, elementHandle);

Using AI Code Generation

1const { Internal } = require('@playwright/test/lib/server/frames');2const { Frame } = require('@playwright/test/lib/server/frames');3const { Page } = require('@playwright/test/lib/server/page');4const { ElementHandle } = require('@playwright/test/lib/server/elementHandler');5const { JSHandle } = require('@playwright/test/lib/server/jsHandle');6const { ChannelOwner } = require('@playwright/test/lib/server/channelOwner');7const { FrameManager } = require('@playwright/test/lib/server/frames');8const { BrowserContext } = require('@playwright/test/lib/server/browserContext');9const { Browser } = require('@playwright/test/lib/server/browser');10const { BrowserType } = require('@playwright/test/lib/server/browserType');11const { BrowserServer } = require('@playwright/test/lib/server/browserServer');12const { Connection } = require('@playwright/test/lib/server/connection');13const { Transport } = require('@playwright/test/lib/server/transport');14const { Logger } = require('@playwright/test/lib/utils/logger');15const { debugLogger } = require('@playwright/test/lib/utils/debugLogger');16const { helper } = require('@playwright/test/lib/helper');17const { TimeoutError } = require('@playwright/test/lib/errors');18const { Events } = require('@playwright/test/lib/server/events');19const { assert } = require('@playwright/test/lib/utils/assert');20const { debugError } = require('@playwright/test/lib/utils/debugError');21const { ProgressController } = require('@playwright/test/lib/server/progress');22const { Progress } = require('@playwright/test/lib/server/progress');23const { Selectors } = require('@playwright/test/lib/server/selectors');24const { FileChooser } = require('@playwright/test/lib/server/fileChooser');25const { Download } = require('@playwright/test/lib/server/download');26const { WebSocketTransport } = require('@playwright/test/lib/server/webSocketTransport');27const { HttpServer } = require('@playwright/test/lib/server/httpServer');28const { BrowserServerLauncher } = require('@playwright/test/lib/server/browserServerLauncher');29const { BrowserFetcher } = require('@playwright/test/lib/server/browserFetcher');30const { BrowserTypeBase } = require('@playwright/test/lib/server/browserType');31const { BrowserContextBase } = require('@playwright/test/lib/server/browserContext');32const { BrowserBase } = require('@playwright/test/lib/server/browser');33const { PageBase

Using AI Code Generation

1const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');2const { Frame } = require('playwright/lib/server/supplements/Frame');3const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');4const { Frame } = require('playwright/lib/server/supplements/Frame');5const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');6const { Frame } = require('playwright/lib/server/supplements/Frame');7const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');8const { Frame } = require('playwright/lib/server/supplements/Frame');9const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');10const { Frame } = require('playwright/lib/server/supplements/Frame');11const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');12const { Frame } = require('playwright/lib/server/supplements/Frame');13const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');14const { Frame } = require('playwright/lib/server/supplements/Frame');15const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');16const { Frame } = require('playwright/lib/server/supplements/Frame');17const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');18const { Frame } = require('playwright/lib/server/supplements/Frame');19const { flattenSingleChildIntoContext } = require('playwright/lib/server/frames');20const { Frame } = require('playwright/lib/server/supplements/Frame');

Using AI Code Generation

1const { flattenSingleChildIntoContext } = require('playwright/lib/server/common/stackTrace');2const { stackTrace } = require('playwright/lib/utils/stackTrace');3const { test } = require('@playwright/test');4test('test', async ({ page }) => {5  const element = await page.$('div');6  flattenSingleChildIntoContext(stackTrace(), element);7});

Using AI Code Generation

1const {flattenSingleChildIntoContext} = require('playwright/lib/server/frames');2const {Page} = require('playwright/lib/server/page');3const {Frame} = require('playwright/lib/server/frames');4const {ElementHandle} = require('playwright/lib/server/dom');5const {JSHandle} = require('playwright/lib/server/jsHandle');6const {BrowserContext} = require('playwright/lib/server/browserContext');7const {Browser} = require('playwright/lib/server/browser');8let browser = new Browser();9let browserContext = new BrowserContext(browser);10let page = new Page(browserContext);11let frame = new Frame(page, null, 'frameId');12let elementHandle = new ElementHandle(frame, {}, 'elementId');13let childContext = new BrowserContext(browser);14flattenSingleChildIntoContext(childContext, browserContext);15let childFrame = new Frame(page, null, 'childFrameId');16flattenSingleChildIntoContext(childFrame, frame);17let childElement = new ElementHandle(frame, {}, 'childElementId');18flattenSingleChildIntoContext(childElement, elementHandle);19let childJsHandle = new JSHandle(frame, {}, 'childJsHandleId');20flattenSingleChildIntoContext(childJsHandle, childJsHandle);21let childPage = new Page(browserContext);22flattenSingleChildIntoContext(childPage, page);23let childBrowserContext = new BrowserContext(browser);24flattenSingleChildIntoContext(childBrowserContext, browserContext);25let childBrowser = new Browser();26flattenSingleChildIntoContext(childBrowser, browser);27flattenSingleChildIntoContext(page, page);28flattenSingleChildIntoContext(frame, frame);29flattenSingleChildIntoContext(elementHandle, elementHandle);

Using AI Code Generation

1import { flattenSingleChildIntoContext } from 'playwright/lib/server/dom.js';2const element = await page.$('div');3flattenSingleChildIntoContext(element, page);4I am trying to use the flattenSingleChildIntoContext method of Playwright Internal. But I am unable to import the method. I am getting the following error5I am using the following code to import the method6import { flattenSingleChildIntoContext } from 'playwright/lib/server/dom.js';

Using AI Code Generation

1const {flattenSingleChildIntoContext} = require('./node_modules/playwright/lib/internal/stackTrace');2const ParentComponent = require('./ParentComponent');3const ChildComponent = require('./ChildComponent');4const parentComp = new ParentComponent();5const childComp = new ChildComponent();6flattenSingleChildIntoContext(parentComp, childComp);7const {flattenSingleChildIntoContext} = require('./node_modules/playwright/lib/internal/stackTrace');8const ParentComponent = require('./ParentComponent');9const ChildComponent = require('./ChildComponent');10const parentComp = new ParentComponent();11const childComp = new ChildComponent();12flattenSingleChildIntoContext(parentComp, childComp);13const {flattenSingleChildIntoContext} = require('./node_modules/playwright/lib/internal/stackTrace');14const ParentComponent = require('./ParentComponent');15const ChildComponent = require('./ChildComponent');16const parentComp = new ParentComponent();17const childComp = new ChildComponent();18flattenSingleChildIntoContext(parentComp, childComp);19const {flattenSingleChildIntoContext} = require('./node_modules/playwright/lib/internal/stackTrace');20const ParentComponent = require('./ParentComponent');21const ChildComponent = require('./ChildComponent');22const parentComp = new ParentComponent();23const childComp = new ChildComponent();24flattenSingleChildIntoContext(parentComp, childComp);25const {flattenSingleChildIntoContext} = require('./node_modules/playwright/lib/internal/stackTrace');26const ParentComponent = require('./

StackOverFlow community discussions

Questions

Discussion

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

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

Running Playwright in Azure Function

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:

Different Ways To Style CSS Box Shadow Effects

Have you ever visited a website that only has plain text and images? Most probably, no. It’s because such websites do not exist now. But there was a time when websites only had plain text and images with almost no styling. For the longest time, websites did not focus on user experience. For instance, this is how eBay’s homepage looked in 1999.

A Detailed Guide To Xamarin Testing

Xamarin is an open-source framework that offers cross-platform application development using the C# programming language. It helps to simplify your overall development and management of cross-platform software applications.

The Top 52 Selenium Open Source Projects On GitHub

Selenium, a project hosted by the Apache Software Foundation, is an umbrella open-source project comprising a variety of tools and libraries for test automation. Selenium automation framework enables QA engineers to perform automated web application testing using popular programming languages like Python, Java, JavaScript, C#, Ruby, and PHP.

Joomla Testing Guide: How To Test Joomla Websites

Before we discuss the Joomla testing, let us understand the fundamentals of Joomla and how this content management system allows you to create and maintain web-based applications or websites without having to write and implement complex coding requirements.

How To Automate Toggle Buttons In Selenium Java

If you pay close attention, you’ll notice that toggle switches are all around us because lots of things have two simple states: either ON or OFF (in binary 1 or 0).

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.