133 lines
4.1 KiB
JavaScript
133 lines
4.1 KiB
JavaScript
'use strict';
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// Do this as the first thing so that any code reading it knows the right env.
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process.env.BABEL_ENV = 'development';
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process.env.NODE_ENV = 'development';
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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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// Ensure environment variables are read.
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require('../config/env');
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const fs = require('fs');
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const chalk = require('react-dev-utils/chalk');
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const webpack = require('webpack');
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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 {
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choosePort,
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createCompiler,
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prepareProxy,
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prepareUrls,
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} = require('react-dev-utils/WebpackDevServerUtils');
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const openBrowser = require('react-dev-utils/openBrowser');
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const paths = require('../config/paths');
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const configFactory = require('../config/webpack.config');
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const createDevServerConfig = require('../config/webpackDevServer.config');
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const useYarn = fs.existsSync(paths.yarnLockFile);
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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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const HOST = process.env.HOST || '0.0.0.0';
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if (process.env.HOST) {
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console.log(
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chalk.cyan(
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`Attempting to bind to HOST environment variable: ${chalk.yellow(
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chalk.bold(process.env.HOST)
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)}`
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)
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);
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console.log(
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`If this was unintentional, check that you haven't mistakenly set it in your shell.`
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);
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console.log(
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`Learn more here: ${chalk.yellow('https://bit.ly/CRA-advanced-config')}`
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);
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console.log();
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}
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// We require that you explictly set browsers and do not fall back to
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// browserslist defaults.
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const { checkBrowsers } = require('react-dev-utils/browsersHelper');
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checkBrowsers(paths.appPath, isInteractive)
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.then(() => {
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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. `choosePort()` Promise resolves to the next free port.
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return choosePort(HOST, DEFAULT_PORT);
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})
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.then(port => {
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if (port == null) {
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// We have not found a port.
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return;
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}
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const config = configFactory('development');
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const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
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const appName = require(paths.appPackageJson).name;
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const useTypeScript = fs.existsSync(paths.appTsConfig);
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const urls = prepareUrls(protocol, HOST, port);
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const devSocket = {
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warnings: warnings =>
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devServer.sockWrite(devServer.sockets, 'warnings', warnings),
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errors: errors =>
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devServer.sockWrite(devServer.sockets, 'errors', errors),
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};
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// Create a webpack compiler that is configured with custom messages.
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const compiler = createCompiler({
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appName,
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config,
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devSocket,
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urls,
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useYarn,
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useTypeScript,
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webpack,
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});
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// Load proxy config
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const proxySetting = require(paths.appPackageJson).proxy;
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const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
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// Serve webpack assets generated by the compiler over a web server.
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const serverConfig = createDevServerConfig(
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proxyConfig,
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urls.lanUrlForConfig
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);
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const devServer = new WebpackDevServer(compiler, serverConfig);
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// Launch WebpackDevServer.
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devServer.listen(port, HOST, 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...\n'));
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openBrowser(urls.localUrlForBrowser);
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});
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['SIGINT', 'SIGTERM'].forEach(function(sig) {
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process.on(sig, function() {
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devServer.close();
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process.exit();
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});
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});
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})
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.catch(err => {
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if (err && err.message) {
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console.log(err.message);
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}
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process.exit(1);
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});
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