'use strict'; // Do this as the first thing so that any code reading it knows the right env. process.env.BABEL_ENV = 'development'; process.env.NODE_ENV = 'development'; // Makes the script crash on unhandled rejections instead of silently // ignoring them. In the future, promise rejections that are not handled will // terminate the Node.js process with a non-zero exit code. process.on('unhandledRejection', err => { throw err; }); // Ensure environment variables are read. require('../config/env'); const fs = require('fs'); const chalk = require('chalk'); const webpack = require('webpack'); const WebpackDevServer = require('webpack-dev-server'); const clearConsole = require('react-dev-utils/clearConsole'); const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles'); const { choosePort, createCompiler, prepareProxy, prepareUrls, } = require('react-dev-utils/WebpackDevServerUtils'); const openBrowser = require('react-dev-utils/openBrowser'); const paths = require('../config/paths'); const config = require('../config/webpack.config.dev'); const createDevServerConfig = require('../config/webpackDevServer.config'); const useYarn = fs.existsSync(paths.yarnLockFile); const isInteractive = process.stdout.isTTY; // Warn and crash if required files are missing if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) { process.exit(1); } // Tools like Cloud9 rely on this. const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000; const HOST = process.env.HOST || '0.0.0.0'; if (process.env.HOST) { console.log( chalk.cyan( `Attempting to bind to HOST environment variable: ${chalk.yellow( chalk.bold(process.env.HOST) )}` ) ); console.log( `If this was unintentional, check that you haven't mistakenly set it in your shell.` ); console.log(`Learn more here: ${chalk.yellow('http://bit.ly/2mwWSwH')}`); console.log(); } // We attempt to use the default port but if it is busy, we offer the user to // run on a different port. `choosePort()` Promise resolves to the next free port. choosePort(HOST, DEFAULT_PORT) .then(port => { if (port == null) { // We have not found a port. return; } const protocol = process.env.HTTPS === 'true' ? 'https' : 'http'; const appName = require(paths.appPackageJson).name; const urls = prepareUrls(protocol, HOST, port); // Create a webpack compiler that is configured with custom messages. const compiler = createCompiler(webpack, config, appName, urls, useYarn); // Load proxy config const proxySetting = require(paths.appPackageJson).proxy; const proxyConfig = prepareProxy(proxySetting, paths.appPublic); // Serve webpack assets generated by the compiler over a web sever. const serverConfig = createDevServerConfig( proxyConfig, urls.lanUrlForConfig ); const devServer = new WebpackDevServer(compiler, serverConfig); // Launch WebpackDevServer. devServer.listen(port, HOST, err => { if (err) { return console.log(err); } if (isInteractive) { clearConsole(); } console.log(chalk.cyan('Starting the development server...\n')); openBrowser(urls.localUrlForBrowser); }); ['SIGINT', 'SIGTERM'].forEach(function(sig) { process.on(sig, function() { devServer.close(); process.exit(); }); }); }) .catch(err => { if (err && err.message) { console.log(err.message); } process.exit(1); });