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How to use startDevServer method in Cypress
Best JavaScript code snippet using cypress
watch-all.js
Source:watch-all.js 
...39 file: `${value} files`40 }));41}42let devServer;43function startDevServer() {44 eventBuffer.length = 0;45 devServer = execa(46 'webpack-dev-server',47 ['--stdin', '--progress', '--color', '--env.mode', 'development'],48 {49 cwd: path.join(rootDir, 'packages/venia-concept'),50 localDir: path.join(rootDir, 'node_modules/.bin')51 }52 );53 devServer.on('exit', () => {54 devServer.exited = true;55 });56 devServer.stdout.pipe(process.stdout);57 devServer.stderr.pipe(process.stderr);58}59let isClosing = false;60const runVeniaWatch = debounce(() => {61 if (!devServer) {62 warn('Launching webpack-dev-server');63 return startDevServer();64 }65 const fileSummary =66 eventBuffer.length > 20 ? summarizeEvents() : eventBuffer;67 warn(68 `Relaunching webpack-dev-server due to: \n - ${fileSummary69 .map(70 ({ name, file }) =>71 `${chalk.yellow(name)} ${chalk.whiteBright(file)}`72 )73 .join('\n - ')}\n`74 );75 if (devServer.exited) {76 return startDevServer();77 }78 if (!isClosing) {79 devServer.on('close', () => {80 isClosing = false;81 devServer = false;82 startDevServer();83 });84 isClosing = true;85 devServer.stdout.unpipe(process.stdout);86 devServer.stderr.unpipe(process.stderr);87 devServer.kill();88 }89}, 800);90function watchRestartRequirements() {91 return chokidar.watch(restartDevServerOnChange, {92 ignored: '**/__*__/**/*'93 });94}95function watchVeniaWithRestarts() {96 const eventsToListenTo = ['add', 'change', 'unlink'];...
gulpfile.js
Source:gulpfile.js
...11const eslint = require('gulp-eslint');12const imagemin = require('gulp-imagemin');13const connect = require('gulp-connect');14const ts = require('gulp-typescript');15function startDevServer() {16 connect.server({17 root: 'build',18 livereload: true,19 });20}21function jsBuild() {22 return src('src/js/*.js')23 .pipe(babel())24 .pipe(dest('build/'))25 .pipe(uglify())26 .pipe(rename({ extname: '.min.js' }))27 .pipe(dest('build/'))28 .pipe(connect.reload());29}30function scss() {31 return src('src/scss/*.scss')32 .pipe(sass.sync().on('error', sass.logError))33 // .pipe(sass.sync({outputStyle: 'compressed'}).on('error', sass.logError))34 .pipe(dest('build/css'))35 .pipe(connect.reload());36}37function optimize() {38 return src('src/images/*')39 .pipe(imagemin([40 imagemin.mozjpeg({ quality: 75, progressive: true }),41 ]))42 .pipe(dest('build/images'));43}44function lint() {45 return src('src/js/*.js')46 // eslint() attaches the lint output to the "eslint" property47 // of the file object so it can be used by other modules.48 .pipe(eslint())49 // eslint.format() outputs the lint results to the console.50 // Alternatively use eslint.formatEach() (see Docs).51 .pipe(eslint.format())52 // To have the process exit with an error code (1) on53 // lint error, return the stream and pipe to failAfterError last.54 .pipe(eslint.failAfterError());55}56function copyHtmlFile() {57 return src('src/**/*.html')58 .pipe(dest('build'))59 .pipe(connect.reload());60}61function compileTS() {62 return src('src/**/*.ts')63 .pipe(ts({64 outFile: 'typescript-test.js',65 }))66 .pipe(dest('build'));67}68exports.optimizeImages = optimize;69exports.lint = lint;70exports.scss = scss;71exports.jsBuild = jsBuild;72exports.copyHtmlFile = copyHtmlFile;73exports.compileTS = compileTS;74exports.startDevServer = startDevServer;75exports.default = () => {76 // task('startDevServer', startDevServer);77 startDevServer();78 watch('src/*.html', copyHtmlFile);79 watch('src/js/*.js', series(lint, jsBuild));80 watch('src/scss/*.scss', scss);81 watch('src/**/*.ts', compileTS);...
server.dev.js
Source:server.dev.js
...9let port = process.env.PORT || 3000;10let core = new LavasCore(__dirname);11// let app;12let server;13function startDevServer() {14 // app = new Koa();15 core.build()16 .then(() => {17 app.use(core.koaMiddleware());18 /**19 * server.close() only stop accepting new connections,20 * we need to close existing connections with help of stoppable21 */22 server = stoppable(app.listen(port, () => {23 console.log('server started at localhost:' + port);24 }));25 }).catch(err => {26 console.log(err);27 });28}29let config;30// fix https://github.com/lavas-project/lavas/issues/5031if (process.argv.length >= 3 && process.argv[2] !== 'dev') {32 config = process.argv[2];33}34/**35 * every time lavas rebuild, stop current server first and restart36 */37core.on('rebuild', () => {38 core.close().then(() => {39 server.stop();40 startDevServer();41 });42});43core.init(process.env.NODE_ENV || 'development', true, {config})44 .then(() => startDevServer());45// catch promise error46process.on('unhandledRejection', err => {47 console.warn(err);...
start.js
Source:start.js
1const { execSync } = require('child_process');2exports.command = 'start';3exports.desc = 'Starts the Okta Sign-in Widget playground';4exports.builder = {5 watch: {6 description: 'Watches JS and SASS changes'7 },8 mock: {9 description: 'Use pre-recorded responses for specific interactions',10 choices: [11 'mockDuo',12 ],13 },14 open: {15 description: 'Open the browser after the server starts',16 type: 'boolean',17 default: true,18 },19};20exports.handler = async (argv) => {21 const buildDevCmd = 'grunt build:dev';22 let startDevServer = 'webpack-dev-server --config webpack.playground.config.js';23 if (argv.open) {24 startDevServer += ' --open';25 }26 const mock = argv.mock ? `--env.${argv.mock}` : '';27 let cmd;28 if (argv.watch) {29 // Watch mode requires we run tasks concurrently30 cmd = `concurrently "${buildDevCmd}:watch ${mock}" "grunt watch:sass" "${startDevServer}" --kill-others`;31 } else {32 cmd = `${buildDevCmd} ${mock} && ${startDevServer}`;33 }34 const options = {35 stdio: 'inherit',36 env: Object.assign({}, process.env)37 };38 console.log(`Running: ${cmd}`);39 execSync(cmd, options);...
dev-start.js
Source:dev-start.js
1/*2 * @Author: junjie.lean3 * @Date: 2020-01-10 11:06:124 * @Last Modified by: junjie.lean5 * @Last Modified time: 2021-04-21 15:44:586 */78/**9 * å¯å¨èæ¬10 */1112// windowså
¼å®¹:13const spawn = require("cross-spawn");14// const {spawn} = require("child_process")15// console.log(process.env.NODE_ENV)16// webpack-dev-server --config ./config/webpack.base.config --color1718let startDevServer = spawn(19 "npx",20 ["webpack-dev-server", "--config", "./config/webpack.base.config", "--color"],21 {22 env: { ...process.env },23 }24);2526startDevServer.stdout.on("data", (data) => {27 console.log("stdout:", data.toString());28});2930startDevServer.stderr.on("data", (data) => {31 console.log("error:", data.toString());32});3334startDevServer.on("close", (code) => {35 console.log(code);
...
index.mjs
Source:index.mjs
1import mysql from 'promise-mysql';2import createMysqlAdapter from './server/lib/mysqlAdapter.mjs';3import startDevServer from './server/startDevServer.mjs';4import startProdServer from './server/startProdServer.mjs';5import config from './config/server.js';6const startServer = process.env.NODE_ENV === 'production' ? startProdServer : startDevServer;7const run = async () => {8 const connection = await mysql.createPool({ ...config.mysql, connectionLimit: 3 });9 const mysqlAdapter = createMysqlAdapter(connection);10 startServer({ mysqlAdapter });11};...
index.js
Source:index.js
...7 plugins: (webpackConfig.plugins || []).filter((x) => {8 return x.constructor.name !== 'HtmlPwaPlugin'9 }),10 }11 return startDevServer({12 options,13 webpackConfig: modifiedWebpackConfig,14 })15 })16 return config...
startDevServer.js
Source:startDevServer.js
1const webpack = require('webpack')2const config = require('./webpack.config')3const Server = require('./lib/server')4function startDevServer(complier, config) {5 const devServer = config.devServer || {}6 const server = new Server(complier, devServer)7 const { port = 8080, host = '0.0.0.0' } = devServer8 server.listen(port, host, (err) => {9 console.log('run')10 })11}12const complier = webpack(config)13startDevServer(complier, config)...
Using AI Code Generation
1const startDevServer = require('@cypress/webpack-dev-server')2const webpackConfig = require('../../webpack.config')3module.exports = (on, config) => {4 on('dev-server:start', (options) => {5 return startDevServer({6 })7 })8}9const path = require('path')10const HtmlWebpackPlugin = require('html-webpack-plugin')11const webpack = require('webpack')12const { VueLoaderPlugin } = require('vue-loader')13const { CleanWebpackPlugin } = require('clean-webpack-plugin')14const CopyPlugin = require('copy-webpack-plugin')15const MiniCssExtractPlugin = require('mini-css-extract-plugin')16const TerserPlugin = require('terser-webpack-plugin')17const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')18const VueSSRClientPlugin = require('vue-server-renderer/client-plugin')19const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer')20const VuetifyLoaderPlugin = require('vuetify-loader/lib/plugin')21const { InjectManifest } = require('workbox-webpack-plugin')22const { version } = require('../package.json')23const env = require('./env')24const { isProd, isTest } = require('./utils')25const { resolve } = require('./utils')26const { VUE_APP_BASE_URL, VUE_APP_BASE_API, VUE_APP_BASE_SOCKET, VUE_APP_BASE_IMAGE } = env27const config = {28 entry: {29 },30 output: {31 path: resolve('dist'),32 },33 resolve: {34 alias: {35 '@': resolve('src'),36 },37 },38 module: {39 {40 test: /\.(js|vue)$/,41 include: [resolve('src'), resolve('test')],
Using AI Code Generation
1const { startDevServer } = require("@cypress/webpack-dev-server");2module.exports = (on, config) => {3 on("dev-server:start", (options) => {4 return startDevServer({5 });6 });7};8module.exports = (on, config) => {9 require("@cypress/react/plugins/react-scripts")(on, config);10 require("./test");11 return config;12};13{14 "component": {15 "testFiles": "**/*.spec.{js,jsx,ts,tsx}"16 }17}18import React from "react";19import MyComponent from "../../src/components/MyComponent";20import { mount } from "@cypress/react";21describe("MyComponent", () => {22 it("should render", () => {23 mount(<MyComponent />);24 cy.get("h1").should("contain", "Hello World");25 });26});27import React from "react";28const MyComponent = () => {29 return <h1>Hello World</h1>;30};31export default MyComponent;32import React from "react";33import { mount } from "@cypress/react";34import MyComponent from "./MyComponent";35describe("MyComponent", () => {36 it("should render", () => {37 mount(<MyComponent />);38 cy.get("h1").should("contain", "Hello World");39 });40});41const { startDevServer } = require("@cypress/webpack-dev-server");42module.exports = (on, config) => {43 on("dev-server:start", (options) => {44 return startDevServer({45 });46 });47};48{49 "component": {50 "testFiles": "**/*.spec.{js,jsx,ts,tsx}"51 }52}53import React from "react";54import MyComponent from "../../src/components/My
Using AI Code Generation
1describe('My First Test', function() {2 it('Does not do much!', function() {3 cy.startDevServer()4 cy.visit('/')5 })6})7const injectDevServer = require('@cypress/react/plugins/next')8module.exports = (on, config) => {9 injectDevServer(on, config)10}11require('@cypress/react/support')
Using AI Code Generation
1const startDevServer = require('@cypress/webpack-dev-server')2const webpackConfig = require('@vue/cli-service/webpack.config.js')3const options = {4 watchOptions: {},5}6startDevServer(options)7{8}9import './commands'10if (window.Cypress) {11}12describe('My First Test', () => {13 it('Visits the app root url', () => {14 cy.visit('/')15 cy.contains('h1', 'Hello World!')16 })17})
Using AI Code Generation
1const { startDevServer } = require('@cypress/vite-dev-server')2module.exports = (on, config) => {3 on('dev-server:start', (options) => {4 return startDevServer({5 viteConfig: {6 },7 })8 })9}10const { defineConfig } = require('vite')11const reactRefresh = require('@vitejs/plugin-react-refresh')12const cypressPlugin = require('vite-plugin-cypress')13module.exports = defineConfig({14 plugins: [reactRefresh(), cypressPlugin()],15})16const { startDevServer } = require('@cypress/vite-dev-server')17module.exports = (on, config) => {18 on('dev-server:start', (options) => {19 return startDevServer({20 viteConfig: {21 },22 })23 })24}25const { defineConfig } = require('vite')26const reactRefresh = require('@vitejs/plugin-react-refresh')27const cypressPlugin = require('vite-plugin-cypress')28module.exports = defineConfig({29 plugins: [reactRefresh(), cypressPlugin()],30})31const { startDevServer } = require('@cypress/vite-dev-server')32module.exports = (on, config) => {33 on('dev-server:start', (options) => {34 return startDevServer({35 viteConfig: {36 },37 })38 })39}40const { defineConfig } = require('vite')
Using AI Code Generation
1const startDevServer = require('@cypress/react/plugins/next')2module.exports = (on, config) => {3 startDevServer(on, config)4}5const { startDevServer } = require('./dev-server')6module.exports = (on, config) => {7 startDevServer(on, config)8}9import '@cypress/code-coverage/support'10import './commands'11Cypress.Commands.add('login', (email, password) => {12 cy.get('[data-test-id="email-input"]').type(email)13 cy.get('[data-test-id="password-input"]').type(password)14 cy.get('[data-test-id="submit-button"]').click()15})16describe('Login', () => {17 beforeEach(() => {18 cy.visit('/login')19 })20 it('should login with valid credentials', () => {21 cy.login('
Using AI Code Generation
1cy.startDevServer({2 options: {3 env: {4 },5 },6});7const { startDevServer } = require("@cypress/webpack-dev-server");8const webpackConfig = require("../../webpack.config");9module.exports = (on, config) => {10 on("dev-server:start", (options) => {11 return startDevServer({12 });13 });14};15Cypress.Commands.add("startDevServer", (options) => {16 return cy.task("dev-server:start", options);17});18import "./commands";19{
Using AI Code Generation
1const { startDevServer } = require('@cypress/webpack-dev-server')2const webpackConfig = require('../webpack.config')3const devServerConfig = {4}5module.exports = (on, config) => {6 on('dev-server:start', (options) => {7 return startDevServer({ options, devServerConfig })8 })9}10const path = require('path')11module.exports = {12 output: {13 path: path.resolve(__dirname, 'dist'),14 },15 devServer: {16 contentBase: path.join(__dirname, 'dist'),17 },18}19{20}21describe('Webpack test', () => {22 it('loads the app', () => {23 cy.visit('/')24 })25})26import './commands'27 * @type {Cypress.PluginConfig}28module.exports = (on, config) => {29}
Cypress Tutorial
Cypress is a renowned Javascript-based open-source, easy-to-use end-to-end testing framework primarily used for testing web applications. Cypress is a relatively new player in the automation testing space and has been gaining much traction lately, as evidenced by the number of Forks (2.7K) and Stars (42.1K) for the project. LambdaTest’s Cypress Tutorial covers step-by-step guides that will help you learn from the basics till you run automation tests on LambdaTest.
Chapters:
- What is Cypress? -
- Why Cypress? - Learn why Cypress might be a good choice for testing your web applications.
- Features of Cypress Testing - Learn about features that make Cypress a powerful and flexible tool for testing web applications.
- Cypress Drawbacks - Although Cypress has many strengths, it has a few limitations that you should be aware of.
- Cypress Architecture - Learn more about Cypress architecture and how it is designed to be run directly in the browser, i.e., it does not have any additional servers.
- Browsers Supported by Cypress - Cypress is built on top of the Electron browser, supporting all modern web browsers. Learn browsers that support Cypress.
- Selenium vs Cypress: A Detailed Comparison - Compare and explore some key differences in terms of their design and features.
- Cypress Learning: Best Practices - Take a deep dive into some of the best practices you should use to avoid anti-patterns in your automation tests.
- How To Run Cypress Tests on LambdaTest? - Set up a LambdaTest account, and now you are all set to learn how to run Cypress tests.
Certification
You can elevate your expertise with end-to-end testing using the Cypress automation framework and stay one step ahead in your career by earning a Cypress certification. Check out our Cypress 101 Certification.
YouTube
Watch this 3 hours of complete tutorial to learn the basics of Cypress and various Cypress commands with the Cypress testing at LambdaTest.
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