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How to use bindAutoBindMethod method in Playwright Internal

Best JavaScript code snippet using playwright-internal

bindAutoBindMethods.js

...8 *9 * Original:10 * https://github.com/facebook/react/blob/6508b1ad273a6f371e8d90ae676e5390199461b4/src/isomorphic/classic/class/ReactClass.js#L650-L71311 */12function bindAutoBindMethod(component, method) {13  var boundMethod = method.bind(component);14  boundMethod.__reactBoundContext = component;15  boundMethod.__reactBoundMethod = method;16  boundMethod.__reactBoundArguments = null;17  var componentName = component.constructor.displayName,18      _bind = boundMethod.bind;19  boundMethod.bind = function (newThis) {20    var args = Array.prototype.slice.call(arguments, 1);21    if (newThis !== component && newThis !== null) {22      console.warn(23        'bind(): React component methods may only be bound to the ' +24        'component instance. See ' + componentName25      );26    } else if (!args.length) {27      console.warn(28        'bind(): You are binding a component method to the component. ' +29        'React does this for you automatically in a high-performance ' +30        'way, so you can safely remove this call. See ' + componentName31      );32      return boundMethod;33    }34    var reboundMethod = _bind.apply(boundMethod, arguments);35    reboundMethod.__reactBoundContext = component;36    reboundMethod.__reactBoundMethod = method;37    reboundMethod.__reactBoundArguments = args;38    return reboundMethod;39  };40  return boundMethod;41}42function bindAutoBindMethodsFromMap(component) {43  for (var autoBindKey in component.__reactAutoBindMap) {44    if (!component.__reactAutoBindMap.hasOwnProperty(autoBindKey)) {45      return;46    }47    // Tweak: skip methods that are already bound.48    // This is to preserve method reference in case it is used49    // as a subscription handler that needs to be detached later.50    if (51      component.hasOwnProperty(autoBindKey) &&52      component[autoBindKey].__reactBoundContext === component53    ) {54      continue;55    }56    var method = component.__reactAutoBindMap[autoBindKey];57    component[autoBindKey] = bindAutoBindMethod(component, method);58  }59}60export default function bindAutoBindMethods(component) {61  if (component.__reactAutoBindPairs) {62    bindAutoBindMethodsFromArray(component);63  } else if (component.__reactAutoBindMap) {64    bindAutoBindMethodsFromMap(component);65  }66}67function bindAutoBindMethodsFromArray(component) {68  var pairs = component.__reactAutoBindPairs;69  if (!pairs) {70    return;71  }72  for (var i = 0; i < pairs.length; i += 2) {73    var autoBindKey = pairs[i];74    if (75      component.hasOwnProperty(autoBindKey) &&76      component[autoBindKey].__reactBoundContext === component77    ) {78      continue;79    }80    var method = pairs[i + 1];81    component[autoBindKey] = bindAutoBindMethod(82      component,83      method84    );85  }...

8cced7bindAutoBindMethods.js

Source: 8cced7bindAutoBindMethods.js

2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.default = bindAutoBindMethods;6function bindAutoBindMethod(component, method) {7  var boundMethod = method.bind(component);8  boundMethod.__reactBoundContext = component;9  boundMethod.__reactBoundMethod = method;10  boundMethod.__reactBoundArguments = null;11  var componentName = component.constructor.displayName,12      _bind = boundMethod.bind;13  boundMethod.bind = function (newThis) {14    var args = Array.prototype.slice.call(arguments, 1);15    if (newThis !== component && newThis !== null) {16      console.warn('bind(): React component methods may only be bound to the ' + 'component instance. See ' + componentName);17    } else if (!args.length) {18      console.warn('bind(): You are binding a component method to the component. ' + 'React does this for you automatically in a high-performance ' + 'way, so you can safely remove this call. See ' + componentName);19      return boundMethod;20    }21    var reboundMethod = _bind.apply(boundMethod, arguments);22    reboundMethod.__reactBoundContext = component;23    reboundMethod.__reactBoundMethod = method;24    reboundMethod.__reactBoundArguments = args;25    return reboundMethod;26  };27  return boundMethod;28}29function bindAutoBindMethodsFromMap(component) {30  for (var autoBindKey in component.__reactAutoBindMap) {31    if (!component.__reactAutoBindMap.hasOwnProperty(autoBindKey)) {32      return;33    }34    if (component.hasOwnProperty(autoBindKey) && component[autoBindKey].__reactBoundContext === component) {35      continue;36    }37    var method = component.__reactAutoBindMap[autoBindKey];38    component[autoBindKey] = bindAutoBindMethod(component, method);39  }40}41function bindAutoBindMethods(component) {42  if (component.__reactAutoBindPairs) {43    bindAutoBindMethodsFromArray(component);44  } else if (component.__reactAutoBindMap) {45    bindAutoBindMethodsFromMap(component);46  }47}48function bindAutoBindMethodsFromArray(component) {49  var pairs = component.__reactAutoBindPairs;50  if (!pairs) {51    return;52  }53  for (var i = 0; i < pairs.length; i += 2) {54    var autoBindKey = pairs[i];55    if (component.hasOwnProperty(autoBindKey) && component[autoBindKey].__reactBoundContext === component) {56      continue;57    }58    var method = pairs[i + 1];59    component[autoBindKey] = bindAutoBindMethod(component, method);60  }...

0c256bbindAutoBindMethods.js

Source: 0c256bbindAutoBindMethods.js

2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.default = bindAutoBindMethods;6function bindAutoBindMethod(component, method) {7  var boundMethod = method.bind(component);8  boundMethod.__reactBoundContext = component;9  boundMethod.__reactBoundMethod = method;10  boundMethod.__reactBoundArguments = null;11  var componentName = component.constructor.displayName,12      _bind = boundMethod.bind;13  boundMethod.bind = function (newThis) {14    var args = Array.prototype.slice.call(arguments, 1);15    if (newThis !== component && newThis !== null) {16      console.warn('bind(): React component methods may only be bound to the ' + 'component instance. See ' + componentName);17    } else if (!args.length) {18      console.warn('bind(): You are binding a component method to the component. ' + 'React does this for you automatically in a high-performance ' + 'way, so you can safely remove this call. See ' + componentName);19      return boundMethod;20    }21    var reboundMethod = _bind.apply(boundMethod, arguments);22    reboundMethod.__reactBoundContext = component;23    reboundMethod.__reactBoundMethod = method;24    reboundMethod.__reactBoundArguments = args;25    return reboundMethod;26  };27  return boundMethod;28}29function bindAutoBindMethodsFromMap(component) {30  for (var autoBindKey in component.__reactAutoBindMap) {31    if (!component.__reactAutoBindMap.hasOwnProperty(autoBindKey)) {32      return;33    }34    if (component.hasOwnProperty(autoBindKey) && component[autoBindKey].__reactBoundContext === component) {35      continue;36    }37    var method = component.__reactAutoBindMap[autoBindKey];38    component[autoBindKey] = bindAutoBindMethod(component, method);39  }40}41function bindAutoBindMethods(component) {42  if (component.__reactAutoBindPairs) {43    bindAutoBindMethodsFromArray(component);44  } else if (component.__reactAutoBindMap) {45    bindAutoBindMethodsFromMap(component);46  }47}48function bindAutoBindMethodsFromArray(component) {49  var pairs = component.__reactAutoBindPairs;50  if (!pairs) {51    return;52  }53  for (var i = 0; i < pairs.length; i += 2) {54    var autoBindKey = pairs[i];55    if (component.hasOwnProperty(autoBindKey) && component[autoBindKey].__reactBoundContext === component) {56      continue;57    }58    var method = pairs[i + 1];59    component[autoBindKey] = bindAutoBindMethod(component, method);60  }...

44a2a6bindAutoBindMethods.js

Source: 44a2a6bindAutoBindMethods.js

2Object.defineProperty(exports, "__esModule", {3  value: true4});5exports.default = bindAutoBindMethods;6function bindAutoBindMethod(component, method) {7  var boundMethod = method.bind(component);8  boundMethod.__reactBoundContext = component;9  boundMethod.__reactBoundMethod = method;10  boundMethod.__reactBoundArguments = null;11  var componentName = component.constructor.displayName,12      _bind = boundMethod.bind;13  boundMethod.bind = function (newThis) {14    var args = Array.prototype.slice.call(arguments, 1);15    if (newThis !== component && newThis !== null) {16      console.warn('bind(): React component methods may only be bound to the ' + 'component instance. See ' + componentName);17    } else if (!args.length) {18      console.warn('bind(): You are binding a component method to the component. ' + 'React does this for you automatically in a high-performance ' + 'way, so you can safely remove this call. See ' + componentName);19      return boundMethod;20    }21    var reboundMethod = _bind.apply(boundMethod, arguments);22    reboundMethod.__reactBoundContext = component;23    reboundMethod.__reactBoundMethod = method;24    reboundMethod.__reactBoundArguments = args;25    return reboundMethod;26  };27  return boundMethod;28}29function bindAutoBindMethodsFromMap(component) {30  for (var autoBindKey in component.__reactAutoBindMap) {31    if (!component.__reactAutoBindMap.hasOwnProperty(autoBindKey)) {32      return;33    }34    if (component.hasOwnProperty(autoBindKey) && component[autoBindKey].__reactBoundContext === component) {35      continue;36    }37    var method = component.__reactAutoBindMap[autoBindKey];38    component[autoBindKey] = bindAutoBindMethod(component, method);39  }40}41function bindAutoBindMethods(component) {42  if (component.__reactAutoBindPairs) {43    bindAutoBindMethodsFromArray(component);44  } else if (component.__reactAutoBindMap) {45    bindAutoBindMethodsFromMap(component);46  }47}48function bindAutoBindMethodsFromArray(component) {49  var pairs = component.__reactAutoBindPairs;50  if (!pairs) {51    return;52  }53  for (var i = 0; i < pairs.length; i += 2) {54    var autoBindKey = pairs[i];55    if (component.hasOwnProperty(autoBindKey) && component[autoBindKey].__reactBoundContext === component) {56      continue;57    }58    var method = pairs[i + 1];59    component[autoBindKey] = bindAutoBindMethod(component, method);60  }...

087dcfbindAutoBindMethods.js

Source: 087dcfbindAutoBindMethods.js

1'use strict';2Object.defineProperty(exports,"__esModule",{3value:true});4exports.default=bindAutoBindMethods;5function bindAutoBindMethod(component,method){6var boundMethod=method.bind(component);7boundMethod.__reactBoundContext=component;8boundMethod.__reactBoundMethod=method;9boundMethod.__reactBoundArguments=null;10var componentName=component.constructor.displayName,11_bind=boundMethod.bind;12boundMethod.bind=function(newThis){13var args=Array.prototype.slice.call(arguments,1);14if(newThis!==component&&newThis!==null){15console.warn('bind(): React component methods may only be bound to the '+'component instance. See '+componentName);16}else if(!args.length){17console.warn('bind(): You are binding a component method to the component. '+'React does this for you automatically in a high-performance '+'way, so you can safely remove this call. See '+componentName);18return boundMethod;19}20var reboundMethod=_bind.apply(boundMethod,arguments);21reboundMethod.__reactBoundContext=component;22reboundMethod.__reactBoundMethod=method;23reboundMethod.__reactBoundArguments=args;24return reboundMethod;25};26return boundMethod;27}28function bindAutoBindMethodsFromMap(component){29for(var autoBindKey in component.__reactAutoBindMap){30if(!component.__reactAutoBindMap.hasOwnProperty(autoBindKey)){31return;32}33if(component.hasOwnProperty(autoBindKey)&&component[autoBindKey].__reactBoundContext===component){34continue;35}36var method=component.__reactAutoBindMap[autoBindKey];37component[autoBindKey]=bindAutoBindMethod(component,method);38}39}40function bindAutoBindMethods(component){41if(component.__reactAutoBindPairs){42bindAutoBindMethodsFromArray(component);43}else if(component.__reactAutoBindMap){44bindAutoBindMethodsFromMap(component);45}46}47function bindAutoBindMethodsFromArray(component){48var pairs=component.__reactAutoBindPairs;49if(!pairs){50return;51}52for(var i=0;i<pairs.length;i+=2){53var autoBindKey=pairs[i];54if(component.hasOwnProperty(autoBindKey)&&component[autoBindKey].__reactBoundContext===component){55continue;56}57var method=pairs[i+1];58component[autoBindKey]=bindAutoBindMethod(component,method);59}...

5a86acbindAutoBindMethods.js

Source: 5a86acbindAutoBindMethods.js

1'use strict';2Object.defineProperty(exports,"__esModule",{3value:true});4exports.default=bindAutoBindMethods;5function bindAutoBindMethod(component,method){6var boundMethod=method.bind(component);7boundMethod.__reactBoundContext=component;8boundMethod.__reactBoundMethod=method;9boundMethod.__reactBoundArguments=null;10var componentName=component.constructor.displayName,11_bind=boundMethod.bind;12boundMethod.bind=function(newThis){13var args=Array.prototype.slice.call(arguments,1);14if(newThis!==component&&newThis!==null){15console.warn('bind(): React component methods may only be bound to the '+'component instance. See '+componentName);16}else if(!args.length){17console.warn('bind(): You are binding a component method to the component. '+'React does this for you automatically in a high-performance '+'way, so you can safely remove this call. See '+componentName);18return boundMethod;19}20var reboundMethod=_bind.apply(boundMethod,arguments);21reboundMethod.__reactBoundContext=component;22reboundMethod.__reactBoundMethod=method;23reboundMethod.__reactBoundArguments=args;24return reboundMethod;25};26return boundMethod;27}28function bindAutoBindMethodsFromMap(component){29for(var autoBindKey in component.__reactAutoBindMap){30if(!component.__reactAutoBindMap.hasOwnProperty(autoBindKey)){31return;32}33if(component.hasOwnProperty(autoBindKey)&&component[autoBindKey].__reactBoundContext===component){34continue;35}36var method=component.__reactAutoBindMap[autoBindKey];37component[autoBindKey]=bindAutoBindMethod(component,method);38}39}40function bindAutoBindMethods(component){41if(component.__reactAutoBindPairs){42bindAutoBindMethodsFromArray(component);43}else if(component.__reactAutoBindMap){44bindAutoBindMethodsFromMap(component);45}46}47function bindAutoBindMethodsFromArray(component){48var pairs=component.__reactAutoBindPairs;49if(!pairs){50return;51}52for(var i=0;i<pairs.length;i+=2){53var autoBindKey=pairs[i];54if(component.hasOwnProperty(autoBindKey)&&component[autoBindKey].__reactBoundContext===component){55continue;56}57var method=pairs[i+1];58component[autoBindKey]=bindAutoBindMethod(component,method);59}...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const context = await browser.newContext();5  const page = await context.newPage();6  await page.screenshot({ path: 'example.png' });7  await browser.close();8})();

Using AI Code Generation

1const { bindAutoBindMethod } = require('playwright/lib/server/instrumentation');2const { Page } = require('playwright/lib/server/page');3bindAutoBindMethod(Page.prototype, 'close', (close) => {4  return async function (...args) {5    console.log(`Closing page with title "${this.title()}"`);6    return close.call(this, ...args);7  };8});9const { bindAutoBindMethods } = require('playwright/lib/server/instrumentation');10const { Page } = require('playwright/lib/server/page');11bindAutoBindMethods(Page.prototype, ['close', 'reload'], (method, methodName) => {12  return async function (...args) {13    console.log(`${methodName} page with title "${this.title()}"`);14    return method.call(this, ...args);15  };16});17const playwright = require('playwright');18(async () => {19  for (const browserType of ['chromium', 'firefox', 'webkit']) {20    const browser = await playwright[browserType].launch();21    const context = await browser.newContext();22    const page = await context.newPage();23    await page.close();24    await browser.close();25  }26})();27const { bindElementHandle } = require('playwright/lib/server/instrumentation');28const { ElementHandle } = require('playwright/lib/server/dom');29bindElementHandle(ElementHandle.prototype, 'innerHTML', (innerHTML) => {30  return async function (...args) {31    console.log(`Getting innerHTML of element with selector "${this._selector}"`);32    return innerHTML.call(this, ...args);33  };34});35const { bindElementHandles } = require('playwright/lib/server/instrumentation');36const { ElementHandle } = require('playwright/lib/server/dom');37bindElementHandles(ElementHandle.prototype, ['innerHTML', 'innerText'], (method, methodName) => {38  return async function (...args) {39    console.log(`Getting ${methodName} of element with selector "${this._selector}"`);40    return method.call(this, ...args);41  };42});43const playwright = require('playwright');44(async () => {45  for (const browserType of ['chromium', 'firefox', 'webkit']) {

Using AI Code Generation

1const { Playwright } = require('playwright');2const playwright = new Playwright();3const { Page } = require('playwright/lib/page');4const page = new Page(playwright, null, null);5page.bindAutoBindMethod('foo', 'bar');6console.log(page.foo);7const { Playwright } = require('playwright');8const playwright = new Playwright();9const { Page } = require('playwright/lib/page');10const page = new Page(playwright, null, null);11page.bindAutoBindMethod('foo', 'bar');12console.log(page.foo);13const { Playwright } = require('playwright');14const playwright = new Playwright();15const { Page } = require('playwright/lib/page');16const page = new Page(playwright, null, null);17page.bindAutoBindMethod('foo', 'bar');18console.log(page.foo);19const { Playwright } = require('playwright');20const playwright = new Playwright();21const { Page } = require('playwright/lib/page');22const page = new Page(playwright, null, null);23page.bindAutoBindMethod('foo', 'bar');24console.log(page.foo);25const { Playwright } = require('playwright');26const playwright = new Playwright();27const { Page } = require('playwright/lib/page');28const page = new Page(playwright, null, null);29page.bindAutoBindMethod('foo', 'bar');30console.log(page.foo);31const { Playwright } = require('playwright');32const playwright = new Playwright();33const { Page } = require('playwright/lib/page');34const page = new Page(playwright, null, null);35page.bindAutoBindMethod('foo', 'bar');36console.log(page.foo);

Using AI Code Generation

1const { bindAutoBindMethods } = require('playwright/lib/utils/utils');2const { Page } = require('playwright/lib/page');3bindAutoBindMethods(Page.prototype);4Page.prototype.myCustomMethod = async function() {5  console.log('my custom method');6}7const { chromium } = require('playwright');8(async () => {9  const browser = await chromium.launch();10  const page = await browser.newPage();11  await page.myCustomMethod();12  await browser.close();13})();14const { Page } = require('playwright/lib/page');15const { bindAutoBindMethods } = require('playwright/lib/utils/utils');16bindAutoBindMethods(Page.prototype);17Page.prototype.myCustomMethod = async function() {18  console.log('my custom method');19}20const { chromium } = require('playwright');21(async () => {22  const browser = await chromium.launch();23  const page = await browser.newPage();24  await page.myCustomMethod();25  await browser.close();26})();27const { Page } = require('playwright/lib/page');28const { bindAutoBindMethods } = require('playwright/lib/utils/utils');29bindAutoBindMethods(Page.prototype);30Page.prototype.myCustomMethod = async function() {31  console.log('my custom method');32}33const { chromium } = require('playwright');34(async () => {35  const browser = await chromium.launch();36  const page = await browser.newPage();37  await page.myCustomMethod();38  await browser.close();39})();40const { Page } = require('playwright/lib/page');41const { bindAutoBindMethods } = require('playwright/lib/utils/utils');42bindAutoBindMethods(Page.prototype);43Page.prototype.myCustomMethod = async function() {44  console.log('my custom method');45}46const { chromium } = require('playwright');47(async () => {48  const browser = await chromium.launch();49  const page = await browser.newPage();50  await page.myCustomMethod();51  await browser.close();52})();53const { Page } = require('playwright/lib/page');54const { bindAutoBindMethods } = require('

Using AI Code Generation

1const { bindAutoBindMethod } = require('@playwright/test/lib/utils/utils');2const { test } = require('@playwright/test');3const { expect } = require('@playwright/test');4test('testing auto bind method', async ({ page }) => {5  const search = await page.$('#search_input_react');6  const searchInput = await search.$('input');7  const searchInputValue = await searchInput.getAttribute('value');8  expect(searchInputValue).toBe('Type to search');9  const searchInputBind = bindAutoBindMethod(page, searchInput);10  await searchInputBind.type('test');11  const searchInputValueAfterType = await searchInputBind.getAttribute('value');12  expect(searchInputValueAfterType).toBe('Type to searchtest');13});

Using AI Code Generation

1const { Playwright } = require('playwright-core/lib/server/playwright');2const playwright = new Playwright();3const browser = playwright.chromium.launch();4const page = browser.newPage();5page.bindAutoBindMethod('myMethod', function() { console.log('myMethod'); });6const { Playwright } = require('playwright-core/lib/server/playwright');7const playwright = new Playwright();8const browser = playwright.chromium.launch();9const page = browser.newPage();10page.bindAutoBindMethod('myMethod', function() { console.log('myMethod'); });

Using AI Code Generation

1const { chromium } = require('playwright');2const { bindAutoBindMethods } = require('playwright/lib/utils/autobind');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  bindAutoBindMethods(page, page);8  await page.screenshot({ path: 'google.png' });9  await browser.close();10})();

Using AI Code Generation

1const { bindAutoBindMethod } = require('playwright/lib/server/frames');2const { Page } = require('playwright/lib/server/page');3bindAutoBindMethod(Page);4const { bindAutoBindMethod } = require('playwright/lib/server/frames');5const { Page } = require('playwright/lib/server/page');6bindAutoBindMethod(Page);

Using AI Code Generation

1const { Internal } = require('playwright');2const { bindAutoBindMethods } = Internal;3bindAutoBindMethods(new Page());4const { Internal } = require('playwright');5const { bindAutoBindMethods } = Internal;6bindAutoBindMethods(new Page());7await page.click('button');

StackOverFlow community discussions

Questions

Discussion

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

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?

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

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

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

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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.
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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.
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Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.