mirror of
https://github.com/zhigang1992/create-react-app.git
synced 2026-03-29 22:38:26 +08:00
128 lines
4.2 KiB
JavaScript
128 lines
4.2 KiB
JavaScript
// @remove-on-eject-begin
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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// @remove-on-eject-end
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'use strict';
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// Makes the script crash on unhandled rejections instead of silently
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// ignoring them. In the future, promise rejections that are not handled will
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// terminate the Node.js process with a non-zero exit code.
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process.on('unhandledRejection', err => {
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throw err;
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});
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process.env.NODE_ENV = 'development';
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// Load environment variables from .env file. Suppress warnings using silent
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// if this file is missing. dotenv will never modify any environment variables
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// that have already been set.
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// https://github.com/motdotla/dotenv
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require('dotenv').config({ silent: true });
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const fs = require('fs');
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const chalk = require('chalk');
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const detect = require('detect-port');
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const WebpackDevServer = require('webpack-dev-server');
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const clearConsole = require('react-dev-utils/clearConsole');
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const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
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const getProcessForPort = require('react-dev-utils/getProcessForPort');
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const openBrowser = require('react-dev-utils/openBrowser');
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const prompt = require('react-dev-utils/prompt');
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const paths = require('../config/paths');
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const config = require('../config/webpack.config.dev');
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const devServerConfig = require('../config/webpackDevServer.config');
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const createWebpackCompiler = require('./utils/createWebpackCompiler');
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const addWebpackMiddleware = require('./utils/addWebpackMiddleware');
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const useYarn = fs.existsSync(paths.yarnLockFile);
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const cli = useYarn ? 'yarn' : 'npm';
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const isInteractive = process.stdout.isTTY;
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// Warn and crash if required files are missing
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if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
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process.exit(1);
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}
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// Tools like Cloud9 rely on this.
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const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
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function run(port) {
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const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
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const host = process.env.HOST || 'localhost';
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// Create a webpack compiler that is configured with custom messages.
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const compiler = createWebpackCompiler(
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config,
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function onReady(showInstructions) {
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if (!showInstructions) {
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return;
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}
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console.log();
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console.log('The app is running at:');
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console.log();
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console.log(` ${chalk.cyan(`${protocol}://${host}:${port}/`)}`);
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console.log();
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console.log('Note that the development build is not optimized.');
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console.log(
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`To create a production build, use ${chalk.cyan(`${cli} run build`)}.`
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);
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console.log();
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}
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);
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// Serve webpack assets generated by the compiler over a web sever.
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const devServer = new WebpackDevServer(compiler, devServerConfig);
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// Our custom middleware proxies requests to /index.html or a remote API.
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addWebpackMiddleware(devServer);
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// Launch WebpackDevServer.
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devServer.listen(port, err => {
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if (err) {
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return console.log(err);
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}
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if (isInteractive) {
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clearConsole();
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}
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console.log(chalk.cyan('Starting the development server...'));
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console.log();
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openBrowser(`${protocol}://${host}:${port}/`);
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});
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}
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// We attempt to use the default port but if it is busy, we offer the user to
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// run on a different port. `detect()` Promise resolves to the next free port.
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detect(DEFAULT_PORT).then(port => {
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if (port === DEFAULT_PORT) {
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run(port);
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return;
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}
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if (isInteractive) {
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clearConsole();
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const existingProcess = getProcessForPort(DEFAULT_PORT);
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const question = chalk.yellow(
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`Something is already running on port ${DEFAULT_PORT}.` +
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`${existingProcess ? ` Probably:\n ${existingProcess}` : ''}`
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) + '\n\nWould you like to run the app on another port instead?';
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prompt(question, true).then(shouldChangePort => {
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if (shouldChangePort) {
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run(port);
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}
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});
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} else {
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console.log(
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chalk.red(`Something is already running on port ${DEFAULT_PORT}.`)
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);
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}
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});
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