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How to use createAppAPI method in Playwright Internal

Best JavaScript code snippet using playwright-internal

index.js

...108    create = (...args) => {109        const app = createApp(...args);110        app.on('destroy', destroy);111        state.apps.push(app);112        return createAppAPI(app);113    };114    // destroys apps and removes them from the app array115    destroy = hook => {116        // returns true if the app was destroyed successfully117        const indexToRemove = state.apps.findIndex(app => app.isAttachedTo(hook));118        if (indexToRemove >= 0) {119            120            // remove from apps121            const app = state.apps.splice(indexToRemove, 1)[0];122            // restore original dom element123            app.restoreElement();124            return true;125        }126        return false;127    };128    // parses the given context for plugins (does not include the context element itself)129    parse = context => {130        // get all possible hooks131        const matchedHooks = Array.from(context.querySelectorAll(`.${name}`));132        // filter out already active hooks133        const newHooks = matchedHooks.filter(134            newHook => !state.apps.find(app => app.isAttachedTo(newHook))135        );136        // create new instance for each hook137        return newHooks.map(hook => create(hook));138    };139    // returns an app based on the given element hook140    find = hook => {141        const app = state.apps.find(app => app.isAttachedTo(hook));142        if (!app) {143            return null;144        }145        return createAppAPI(app);146    };147    // adds a plugin extension148    registerPlugin = (...plugins) => {149        // register plugins150        plugins.forEach(createAppPlugin);151        // update OptionTypes, each plugin might have extended the default options152        updateOptionTypes();153    }154    getOptions = () => {155        const opts = {};156        forin(getDefaultOptions(), (key, value) => {157            opts[key] = value[0];158        });159        return opts;...

createRenderer.js

Source: createRenderer.js

...74 insert(recursive(vnode), parent)75 }76 return {77 render,78 createApp: createAppAPI(render)79 }...

vue3-init.js

Source: vue3-init.js

1/*2 * @Author: mrzou3 * @Date: 2021-04-21 20:29:554 * @LastEditors: mrzou5 * @LastEditTime: 2021-06-23 00:31:156 * @Description: file content7 */8// createAppApi9const createAppApi = (render) => {10  return function createApp(rootComponent) {11    const app = {12      mount(rootContainer) {13        // 1. vnode14        const vnode = {15          tag: rootComponent16        }17        // 2. render18        render(vnode, rootContainer)19      }20    }21    return app22  }23}24// åå»º renderer25const createRenderer = ({ querySelector, createElement, insert }) => {26  const render = (vnode, container) => {27    patch(container._vnode || null, vnode, container)28    container._vnode = vnode29  }30  const patch = (n1, n2, container) => {31    // æ ¹ç»ä»¶éç½®32    const rootComponent = n2.tag33    const ctx = rootComponent.data()34    const vnode = rootComponent.render.call(ctx)35    // vnode => dom36    const parent = querySelector(container)37    const child = createElement(vnode.tag)38    //  children39    if (typeof vnode.children === 'string') {40      child.textContent = vnode.children41    } else {42      // todo43    }44    insert(child, parent)45  }46  return {47    render,48    createApp: createAppApi(render)49  }50}51// render52const renderer = createRenderer({53  querySelector(sel) {54    return document.querySelector(sel)55  },56  createElement(tag) {57    return document.createElement(tag)58  },59  insert(child, parent) {60    parent.appendChild(child)61  }62})63const Vue = {64  createApp(options) {65    return renderer.createApp(options)66  }67}68Vue.createApp({69  data() {70    return {71      counter: 072    }73  },74  render() {75    return {76      tag: 'p',77      children: this.counter + ''78    }79  }...

vue3中的柯里化.js

Source: vue3中的柯里化.js

1// æ¯éåçä½ç¨ä¼åäºtree shaking2// vue3æè½½3import App from './App.vue'4const app = createApp(App)5app.mount('#app')6// æºç è§£è¯» - æ¯éåçè¿ç¨7// æ¸²æç¸å³çä¸äºéç½®ï¼æ¯å¦æ´æ°å±æ§çæ¹æ³ï¼æä½ DOM çæ¹æ³8const rendererOptions = {9  patchProp,10  ...nodeOps11}12let renderer13function ensureRenderer() {14  return renderer || (renderer = createRenderer(rendererOptions))15}16function createRenderer(options) {17  return baseCreateRenderer(options)18}19function baseCreateRenderer(options) {20  function render(vnode, container) {21    // ç»ä»¶æ¸²æçæ ¸å¿é»è¾22  }23  return {24    render,25    createApp: createAppApi(render)26  }27}28function createAppApi(render) {29  return function createApp(rootComponent, rootProps = null) {30    const app = {31      _component: rootComponent,32      _props: rootProps,33      mount(rootContainer) {34        const vnode = createVNode(rootComponent, rootProps)35        render(vnode, rootContainer)36        app._container = rootContainer37        return vnode._component.proxy38      }39    }40    return app41  }42}43const createApp = ((...args) => {44  const app = ensureRenderer().createApp(...args)45  const { mount } = app46  app.mount = (containerOrSelector) => {47    // ...48  }49  return app...

createAppApiDialog.directive.js

Source: createAppApiDialog.directive.js

1/**2 * @ngdoc directive3 * @name applications.directive:cmCreateAppApiDialog4 * @description5 * ngDialog to create a new api application6 * @restrict E7 * @requires applications.factory:apiApplications8 * @requires _factory.factory:cmNotify9 * @requires Lodash10 * @requires https://docs.angularjs.org/api/ng/service/$log11 * @requires gettextCatalog12 */13(function () {14    'use strict';15    var directive = function(_, $log, apiApplications, cmNotify, gettextCatalog) {16        return {17            templateUrl:'views/applications/createAppApiDialog.html',18            controller: function($scope) {19                $scope.appApi = {};20                /**21                 * @ngdoc function22                 * @name createAppApi23                 * @methodOf applications.directive:cmCreateAppApiDialog24                 * @description25                 * Create an api application26                 */27                $scope.createAppApi = function() {28                    apiApplications.createApi($scope.appApi).then(function(result) {29                        $scope.confirm(result.data);30                    });31                };32            }33        };34    };35    module.exports = directive;...

api-center.js

Source: api-center.js

1import createUserApi from '@/api/user.js'2import createArticleApi from '@/api/article.js'3import createAppApi from '@/api/app.js'4export default (ctx, inject) => {5  const repositories = {6    myApp: createAppApi(ctx.$axios)(),7    user: createUserApi(ctx.$axios)(),8    article: createArticleApi(ctx.$axios)(),9  }10  inject('Api', repositories)...

Using AI Code Generation

1const { createAppAPI, createPageAPI, createBrowserAPI, createBrowserContextAPI, createSelectorsAPI } = require('playwright-core/lib/server/api');2const app = createAppAPI();3const page = createPageAPI();4const browser = createBrowserAPI();5const browserContext = createBrowserContextAPI();6const selectors = createSelectorsAPI();7const { createAppAPI, createPageAPI, createBrowserAPI, createBrowserContextAPI, createSelectorsAPI } = require('playwright-core/lib/server/api');8const app = createAppAPI();9const page = createPageAPI();10const browser = createBrowserAPI();11const browserContext = createBrowserContextAPI();12const selectors = createSelectorsAPI();13const { createAppAPI, createPageAPI, createBrowserAPI, createBrowserContextAPI, createSelectorsAPI } = require('playwright-core/lib/server/api');14const app = createAppAPI();15const page = createPageAPI();16const browser = createBrowserAPI();17const browserContext = createBrowserContextAPI();18const selectors = createSelectorsAPI();19const { createAppAPI, createPageAPI, createBrowserAPI, createBrowserContextAPI, createSelectorsAPI } = require('playwright-core/lib/server/api');20const app = createAppAPI();21const page = createPageAPI();22const browser = createBrowserAPI();23const browserContext = createBrowserContextAPI();24const selectors = createSelectorsAPI();25const { createAppAPI, createPageAPI, createBrowserAPI, createBrowserContextAPI, createSelectorsAPI } = require('playwright-core/lib/server/api');26const app = createAppAPI();27const page = createPageAPI();28const browser = createBrowserAPI();29const browserContext = createBrowserContextAPI();30const selectors = createSelectorsAPI();31const { createAppAPI, createPageAPI, createBrowserAPI, createBrowserContextAPI, createSelectorsAPI } = require('playwright-core/lib/server/api');32const app = createAppAPI();33const page = createPageAPI();34const browser = createBrowserAPI();

Using AI Code Generation

1const { createAppAPI } = require('playwright');2const app = createAppAPI('chromium');3(async () => {4    const context = await app.launch();5    const page = await context.newPage();6    await page.screenshot({ path: 'example.png' });7    await context.close();8})();9{10  "scripts": {11  },12  "dependencies": {13  }14}

Using AI Code Generation

1const { createAppAPI } = require('playwright-core/lib/server/app');2const { createPlaywright } = require('playwright-core');3const playwright = createPlaywright('chromium');4const app = createAppAPI(playwright);5app.listen(3000);6const { createAppAPI } = require('playwright-core/lib/server/app');7const { createPlaywright } = require('playwright-core');8const playwright = createPlaywright('chromium');9const app = createAppAPI(playwright);10app.listen(3000);

Using AI Code Generation

1const { createAppAPI } = require('playwright/lib/server/api');2const { chromium } = require('playwright');3(async () => {4  const app = await createAppAPI(chromium);5  const browser = await app.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.screenshot({ path: `example.png` });9  await browser.close();10})();

Using AI Code Generation

1const { createAppAPI } = require('playwright-core/lib/server/app');2const { chromium } = require('playwright-core');3const { createServer } = require('http');4const server = createServer(async (request, response) => {5  const app = await createAppAPI(request, response, {6    launchOptions: {7    },8  });9  const browser = await app.browserType.launch(app.launchOptions);10  const context = await browser.newContext();11  const page = await context.newPage();12  await page.screenshot({ path: 'test.png' });13  await browser.close();14  await app.close();15});16server.listen(8080);17{18  "scripts": {19  },20  "dependencies": {21  }22}

Using AI Code Generation

1const { createAppAPI } = require('playwright/lib/server/app');2const app = createAppAPI();3app.listen(3000);4const { chromium } = require('playwright');5(async () => {6  const context = await browser.newContext();7  const page = await context.newPage();8  await page.screenshot({ path: `example.png` });9  await browser.close();10})();

StackOverFlow community discussions

Questions

Discussion

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

firefox browser does not start in playwright

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

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

Running Playwright in Azure Function

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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