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How to use serializeArgument method in Playwright Internal

Best JavaScript code snippet using playwright-internal

helper.js

...54    /**55     * @param {*} arg56     * @return {string}57     */58    function serializeArgument(arg) {59      if (Object.is(arg, undefined))60        return 'undefined';61      return JSON.stringify(arg);62    }63  }64  /**65   * @param {function} nodeFunction66   * @return {function}67   */68  static promisify(nodeFunction) {69    function promisified(...args) {70      return new Promise((resolve, reject) => {71        function callback(err, ...result) {72          if (err)...

jsHandle.js

Source: jsHandle.js

...39    return this._wrapApiCall(async channel => {40      const result = await channel.evaluateExpression({41        expression: String(pageFunction),42        isFunction: typeof pageFunction === 'function',43        arg: serializeArgument(arg)44      });45      return parseResult(result.value);46    });47  }48  async evaluateHandle(pageFunction, arg) {49    return this._wrapApiCall(async channel => {50      const result = await channel.evaluateExpressionHandle({51        expression: String(pageFunction),52        isFunction: typeof pageFunction === 'function',53        arg: serializeArgument(arg)54      });55      return JSHandle.from(result.handle);56    });57  }58  async getProperty(propertyName) {59    return this._wrapApiCall(async channel => {60      const result = await channel.getProperty({61        name: propertyName62      });63      return JSHandle.from(result.handle);64    });65  }66  async getProperties() {67    return this._wrapApiCall(async channel => {68      const map = new Map();69      for (const {70        name,71        value72      } of (await channel.getPropertyList()).properties) map.set(name, JSHandle.from(value));73      return map;74    });75  }76  async jsonValue() {77    return this._wrapApiCall(async channel => {78      return parseResult((await channel.jsonValue()).value);79    });80  }81  asElement() {82    return null;83  }84  async dispose() {85    return this._wrapApiCall(async channel => {86      return await channel.dispose();87    });88  }89  toString() {90    return this._preview;91  }92} // This function takes care of converting all JSHandles to their channels,93// so that generic channel serializer converts them to guids.94exports.JSHandle = JSHandle;95function serializeArgument(arg) {96  const handles = [];97  const pushHandle = channel => {98    handles.push(channel);99    return handles.length - 1;100  };101  const value = (0, _serializers.serializeValue)(arg, value => {102    if (value instanceof JSHandle) return {103      h: pushHandle(value._channel)104    };105    return {106      fallThrough: value107    };108  }, new Set());109  return {...

serialize.js

Source: serialize.js

1var serializeError = require('error-stack-parser');2var uniqueSelector = require('unique-selector');3function serializeArgument(arg, data) {4	var Error = window.Error;5	var ErrorEvent = window.ErrorEvent;6	var RegExp = window.RegExp;7	var Node = window.Node;8	var Element = window.Element;9	var Window = window.Window;10	// serialize(obj) will turn obj into a JSON-ish representation11	var reflist = [];12	function serialize(obj) {13		if (obj === undefined) {14			return JSON.stringify('<undefined>');15		}16		// class: Window17		if (Window && obj instanceof Window) {18			return JSON.stringify('[DOM Window]');19		}20		// class: Element (dom element, cannot be serialized without hazard)21		if (Element && obj instanceof Element) {22			return JSON.stringify('[DOM Element (' + uniqueSelector(obj) + ')]');23		}24		// class: Node (other dom nodes, cannot be serialized without hazard)25		if (Node && obj instanceof Node) {26			return JSON.stringify('[DOM Node (' + obj.nodeName + ')]');27		}28		// class: RegExp29		if (RegExp && obj instanceof RegExp) {30			// turn into a string31			return JSON.stringify('[RegExp (' + obj.toString() + ')]');32		}33		// class: Error34		if (obj instanceof Error) {35			try {36				data.error = serializeError.parse(obj);37			} catch (e) {38				// iOS39				if (typeof obj.stack === 'string') {40					data.error = obj.stack.split('\n');41				}42			}43			return JSON.stringify(obj.name + ': ' + obj.message);44		}45		// class: ErrorEvent46		if (ErrorEvent && obj instanceof ErrorEvent) {47			// ErrorEvent has "filename", "lineno", "message" and possibly "column"/"colno" and "error"48			//49			// The w3c says "column" and has no "error" property.50			// The whatwg says "colno" and adds the "error" property, which is the thrown object.51			//52			// For more information about the insanity, read the two different specifications at:53			//54			// - http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#the-errorevent-interface55			// - http://www.w3.org/TR/html5/webappapis.html#the-errorevent-interface56			// - https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent57			data.filename = obj.filename;58			data.lineno = arg.lineno;59			data.colno = arg.colno || arg.column;60			if (obj.error) {61				data.error = serialize(obj.error);62			}63			return serialize(obj.message);64		}65		// array66		if (Array.isArray(obj)) {67			if (reflist.indexOf(obj) !== -1) {68				return JSON.stringify('[Circular reference]');69			}70			reflist.push(obj);71			return '[' + obj.map(serialize).join(',') + ']';72		}73		// object74		if (obj && typeof obj === 'object') {75			if (reflist.indexOf(obj) !== -1) {76				return JSON.stringify('[Circular reference]');77			}78			reflist.push(obj);79			var keys = Object.keys(obj);80			return '{' + keys.map(function (key) {81				return JSON.stringify(key) + ':' + serialize(obj[key]);82			}).join(',') + '}';83		}84		// scalar85		return JSON.stringify(obj);86	}87	return serialize(arg);88}89module.exports = function serializeArguments(args) {90	var len = args.length;91	var out = new Array(len);92	var data = {};93	for (var i = 0; i < len; i++) {94		var arg = args[i];95		if (typeof arg === 'string') {96			out[i] = arg;97		} else {98			out[i] = serializeArgument(args[i], data);99		}100	}101	var message = out.join(' ');102	if (Object.keys(data).length === 0) {103		data = null;104	}105	return { message: message, data: data };106};107/*****************108 ** WEBPACK FOOTER109 ** ./src/views/main/dofusProxy/clientLogger/serialize.js110 ** module id = 18111 ** module chunks = 0112 **/

command.js

Source: command.js

...75        var isBuffer = Buffer.isBuffer(parameter),76            argument = isBuffer ? parameter : String(parameter);77        if (!argument.length)78        {79            var bodyString = isBuffer ? '$0\r\n\r\n' : helpers.serializeArgument(argument);80            return bufferedWrites + socket.write(bodyString);81        }82        return bufferedWrites + socket.write('$' + argument.length + '\r\n') + socket.write(argument) + socket.write('\r\n');83    }, socket.write(commandHeader));...

worker.js

Source: worker.js

1"use strict";2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.Worker = void 0;6var _events = require("./events");7var _channelOwner = require("./channelOwner");8var _jsHandle = require("./jsHandle");9/**10 * Copyright (c) Microsoft Corporation.11 *12 * Licensed under the Apache License, Version 2.0 (the "License");13 * you may not use this file except in compliance with the License.14 * You may obtain a copy of the License at15 *16 * http://www.apache.org/licenses/LICENSE-2.017 *18 * Unless required by applicable law or agreed to in writing, software19 * distributed under the License is distributed on an "AS IS" BASIS,20 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.21 * See the License for the specific language governing permissions and22 * limitations under the License.23 */24class Worker extends _channelOwner.ChannelOwner {25  // Set for web workers.26  // Set for service workers.27  static from(worker) {28    return worker._object;29  }30  constructor(parent, type, guid, initializer) {31    super(parent, type, guid, initializer);32    this._page = void 0;33    this._context = void 0;34    this._channel.on('close', () => {35      if (this._page) this._page._workers.delete(this);36      if (this._context) this._context._serviceWorkers.delete(this);37      this.emit(_events.Events.Worker.Close, this);38    });39  }40  url() {41    return this._initializer.url;42  }43  async evaluate(pageFunction, arg) {44    (0, _jsHandle.assertMaxArguments)(arguments.length, 2);45    return this._wrapApiCall(async channel => {46      const result = await channel.evaluateExpression({47        expression: String(pageFunction),48        isFunction: typeof pageFunction === 'function',49        arg: (0, _jsHandle.serializeArgument)(arg)50      });51      return (0, _jsHandle.parseResult)(result.value);52    });53  }54  async evaluateHandle(pageFunction, arg) {55    (0, _jsHandle.assertMaxArguments)(arguments.length, 2);56    return this._wrapApiCall(async channel => {57      const result = await channel.evaluateExpressionHandle({58        expression: String(pageFunction),59        isFunction: typeof pageFunction === 'function',60        arg: (0, _jsHandle.serializeArgument)(arg)61      });62      return _jsHandle.JSHandle.from(result.handle);63    });64  }65}...

serializer.cjs

Source: serializer.cjs

...7  constructor (arg) {8    this.arg = arg9  }10  serialize () {11    return this.serializeArgument(this.arg)12  }13  serializeArgument (arg) {14    if (typeof arg == "object" && arg.constructor.apiMakerType == "BaseModel") {15      return {16        api_maker_type: "model",17        model_class_name: digg(arg.modelClassData(), "name"),18        model_id: arg.id()19      }20    } else if (typeof arg == "function" && arg.apiMakerType == "BaseModel") {21      return {22        api_maker_type: "resource",23        name: digg(arg.modelClassData(), "name")24      }25    } else if (arg instanceof Date) {26      let offsetNumber = parseInt((arg.getTimezoneOffset() / 60) * 100, 10)27      offsetNumber = -offsetNumber28      let offset = `${offsetNumber}`29      while (offset.length < 4) {30        offset = `0${offset}`31      }32      return {33        api_maker_type: "datetime",34        value: `${arg.getFullYear()}-${arg.getMonth() + 1}-${arg.getDate()} ${arg.getHours()}:${arg.getMinutes()}:${arg.getSeconds()}+${offset}`35      }36    } else if (Array.isArray(arg)) {37      return this.serializeArray(arg)38    } else if (typeof arg == "object" && arg.constructor && arg.constructor.apiMakerType == "Collection") {39      return {40        api_maker_type: "collection",41        value: this.serializeObject(arg)42      }43    } else if (typeof arg == "object" && arg !== null && arg.constructor.name == "Object") {44      return this.serializeObject(arg)45    } else {46      return arg47    }48  }49  serializeArray (arg) {50    return arg.map((value) => this.serializeArgument(value))51  }52  serializeObject (arg) {53    const newObject = {}54    for (const key in arg) {55      const value = arg[key]56      const newValue = this.serializeArgument(value)57      const newKey = this.serializeArgument(key)58      newObject[newKey] = newValue59    }60    return newObject61  }...

execute.js

Source: execute.js

...13      query: repr.serialize(repr),14      binds: {}15    };16  } else if (isArgument(fragment)) {17    let value = serializeArgument(args, fragment);18    /**19     * Have to re-execute the argument's resolved value, because it could be a string20     * or another fragment or anything really.21     */22    value = execute(value).query;23    return {24      query: value,25      binds: {}26    };27  } else if (typeof fragment === "string") {28    return {29      query: SqlString.escapeId(fragment),30      binds: {}31    };...

helpers.js

Source: helpers.js

...5    var deferred = P.defer();6    setTimeout(deferred.resolve, milliseconds);7    return deferred.promise;8};9exports.serializeArgument = function serializeArgument(argument)10{11    var value = String(argument),12        length = Buffer.byteLength(value);13    return '$' + length + '\r\n' + value + '\r\n';14};15exports.decodeBuffers = function decodeBuffers(reply)16{17    if (Buffer.isBuffer(reply))18        return String(reply);19    if (Array.isArray(reply))20        return _.map(reply, decodeBuffers);21    return reply;22};23exports.rejectQueueWith = function rejectQueueWith(queue, message)...

Using AI Code Generation

1const { serializeArgument } = require('playwright/lib/client/helper');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6})();7const { serializeArgument } = require('playwright/lib/client/helper');8const { chromium } = require('playwright');9(async () => {10  const browser = await chromium.launch();11  const page = await browser.newPage();12  console.log(serializeArgument({foo: 'bar', baz:

Using AI Code Generation

1const { serializeArgument } = require('playwright/lib/client/serializers');2const { serializeArgument } = require('playwright/lib/client/serializers');3const args = serializeArgument({4  corge: Symbol('test'),5  grault: new Date(0),6  waldo: ['foo', 42, true, null, undefined, Symbol('test'), new Date(0), /foo/],7  fred: {8    corge: Symbol('test'),9    grault: new Date(0),10  },11});12console.log(args);13const { serializeArgument } = require('playwright/lib/client/serializers');14const args = serializeArgument({15  corge: Symbol('test'),16  grault: new Date(0),17  waldo: ['foo', 42, true, null, undefined, Symbol('test'), new Date(0), /foo/],18  fred: {

Using AI Code Generation

1const path = require('path');2const playwright = require('playwright');3const { serializeArgument } = require('playwright/lib/server/serializers');4const { convertPlaywrightOptions } = require('playwright/lib/server/converters');5const options = {6  executablePath: path.join(__dirname, 'chrome-win', 'chrome.exe'),7};8const browserOptions = convertPlaywrightOptions(options, 'chromium');9const browser = await playwright.chromium.launch(browserOptions);10const page = await browser.newPage();11const elementHandle = await page.$('h1');12const serializedArgument = serializeArgument(elementHandle);13console.log(serializedArgument);14await browser.close();15Error: Protocol error (Runtime.callFunctionOn): Cannot find context with specified id16const browser = await playwright.chromium.launch(browserOptions);17const context = await browser.newContext();18const page = await context.newPage();19const elementHandle = await page.$('h1');20const serializedArgument = serializeArgument(elementHandle);21const result = await page.evaluateHandle((element) => {22  return element;23}, serializedArgument);24await browser.close();25Error: Protocol error (Runtime.callFunctionOn): Cannot find context with specified id26const browser = await playwright.chromium.launch(browserOptions);27const context = await browser.newContext();28const page = await context.newPage();29const elementHandle = await page.$('h1');30const serializedArgument = serializeArgument(elementHandle);

Using AI Code Generation

1const { serializeArgument } = require('playwright/lib/server/serializers/serializers');2const { Page } = require('playwright/lib/server/page');3const { ElementHandle } = require('playwright/lib/server/dom');4const { JSHandle } = require('playwright/lib/server/jsHandle');5const { Frame } = require('playwright/lib/server/frames');6const page = new Page();7const frame = new Frame(page, 'frameId', 'frameName');8const elementHandle = new ElementHandle(frame, 'elementHandleId', 'elementHandleName');9const jsHandle = new JSHandle(frame, 'jsHandleId', 'jsHandleName');10const serializedElementHandle = serializeArgument(elementHandle);11const serializedJsHandle = serializeArgument(jsHandle);12console.log(serializedElementHandle);13console.log(serializedJsHandle);14const { serializeArgument } = require('playwright/lib/server/serializers/serializers');15const { Page } = require('playwright/lib/server/page');16const { ElementHandle } = require('playwright/lib/server/dom');17const { JSHandle } = require('playwright/lib/server/jsHandle');18const { Frame } = require('playwright/lib/server/frames');19const page = new Page();20const frame = new Frame(page, 'frameId', 'frameName');21const elementHandle = new ElementHandle(frame, 'elementHandleId', 'elementHandleName');22const jsHandle = new JSHandle(frame, 'jsHandleId', 'jsHandleName');23const serializedElementHandle = serializeArgument(elementHandle);24const serializedJsHandle = serializeArgument(jsHandle);25console.log(serializedElementHandle);26console.log(serializedJsHandle);

Using AI Code Generation

1const { serializeArgument } = require('playwright/lib/server/frames');2const arg = { foo: 'bar' };3const result = serializeArgument(arg, 'main');4console.log(result);5{ guid: 'main',6   { type: 'object',7     objectId: '{"injectedScriptId":1,"id":1}',8      { type: 'object',9        entries: [] } } }10const { serializeArgument } = require('playwright/lib/server/frames');11const arg = () => console.log('Hello World');12const result = serializeArgument(arg, 'main');13console.log(result);14{ guid: 'main',15   { type: 'function',16     description: '() => console.log(\'Hello World\')',17     objectId: '{"injectedScriptId":1,"id":2}' } }18const { serializeArgument } = require('playwright/lib/server/frames');19const arg = {20    bar: () => console.log('Hello World')21};22const result = serializeArgument(arg, 'main');23console.log(result);24{ guid: 'main',25   { type: 'object',26     objectId: '{"injectedScriptId":1,"id":3}',27      { type: '

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

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

firefox browser does not start in playwright

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

firefox browser does not start in playwright

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

I played with your example for a while and I got the same errors. These are the things I found that made my example work:

It must be Linux. I know that you mentioned that you picked a Linux plan. But I found that in VS Code that part is hidden, and on the Web the default is Windows. This is important because only the Linux plan runs npm install on the server.

Make sure that you are building on the server. You can find this option in the VS Code Settings:

Make sure you set the environment variable PLAYWRIGHT_BROWSERS_PATH, before making the publish.

https://stackoverflow.com/questions/63949978/running-playwright-in-azure-function

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

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

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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Companies are using DevOps to quickly respond to changing market dynamics and customer requirements.

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.