141 lines
4.5 KiB
JavaScript
141 lines
4.5 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 semver = require('semver')
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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 getClientEnvironment = require('../config/env')
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const react = require(require.resolve('react', { paths: [paths.appPath] }))
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const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1))
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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(`If this was unintentional, check that you haven't mistakenly set it in your shell.`)
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console.log(`Learn more here: ${chalk.yellow('https://cra.link/advanced-config')}`)
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console.log()
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}
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// We require that you explicitly 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, paths.publicUrlOrPath.slice(0, -1))
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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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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, paths.publicUrlOrPath)
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// Serve webpack assets generated by the compiler over a web server.
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const serverConfig = {
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...createDevServerConfig(proxyConfig, urls.lanUrlForConfig),
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host: HOST,
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port
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}
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const devServer = new WebpackDevServer(serverConfig, compiler)
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// Launch WebpackDevServer.
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devServer.startCallback(() => {
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if (isInteractive) {
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clearConsole()
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}
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if (env.raw.FAST_REFRESH && semver.lt(react.version, '16.10.0')) {
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console.log(
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chalk.yellow(
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`Fast Refresh requires React 16.10 or higher. You are using React ${react.version}.`
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)
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)
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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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if (process.env.CI !== 'true') {
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// Gracefully exit when stdin ends
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process.stdin.on('end', 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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