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+'use strict';
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+
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+process.env.NODE_ENV = 'development';
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+
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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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+
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+var chalk = require('chalk');
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+var webpack = require('webpack');
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+var WebpackDevServer = require('webpack-dev-server');
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+var historyApiFallback = require('connect-history-api-fallback');
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+var httpProxyMiddleware = require('http-proxy-middleware');
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+var detect = require('detect-port');
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+var clearConsole = require('react-dev-utils/clearConsole');
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+var checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
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+var formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
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+var getProcessForPort = require('react-dev-utils/getProcessForPort');
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+var openBrowser = require('react-dev-utils/openBrowser');
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+var prompt = require('react-dev-utils/prompt');
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+var fs = require('fs');
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+var config = require('../config/webpack.config.dev');
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+var paths = require('../config/paths');
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+
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+var useYarn = fs.existsSync(paths.yarnLockFile);
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+var cli = useYarn ? 'yarn' : 'npm';
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+var isInteractive = process.stdout.isTTY;
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+
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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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+
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+// Tools like Cloud9 rely on this.
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+var DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
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+var compiler;
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+var handleCompile;
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+
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+// You can safely remove this after ejecting.
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+// We only use this block for testing of Create React App itself:
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+var isSmokeTest = process.argv.some(arg => arg.indexOf('--smoke-test') > -1);
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+if (isSmokeTest) {
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+ handleCompile = function (err, stats) {
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+ if (err || stats.hasErrors() || stats.hasWarnings()) {
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+ process.exit(1);
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+ } else {
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+ process.exit(0);
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+ }
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+ };
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+}
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+
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+function setupCompiler(host, port, protocol) {
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+ // "Compiler" is a low-level interface to Webpack.
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+ // It lets us listen to some events and provide our own custom messages.
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+ compiler = webpack(config, handleCompile);
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+
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+ // "invalid" event fires when you have changed a file, and Webpack is
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+ // recompiling a bundle. WebpackDevServer takes care to pause serving the
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+ // bundle, so if you refresh, it'll wait instead of serving the old one.
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+ // "invalid" is short for "bundle invalidated", it doesn't imply any errors.
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+ compiler.plugin('invalid', function() {
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+ if (isInteractive) {
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+ clearConsole();
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+ }
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+ console.log('Compiling...');
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+ });
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+
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+ var isFirstCompile = true;
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+
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+ // "done" event fires when Webpack has finished recompiling the bundle.
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+ // Whether or not you have warnings or errors, you will get this event.
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+ compiler.plugin('done', function(stats) {
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+ if (isInteractive) {
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+ clearConsole();
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+ }
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+
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+ // We have switched off the default Webpack output in WebpackDevServer
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+ // options so we are going to "massage" the warnings and errors and present
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+ // them in a readable focused way.
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+ var messages = formatWebpackMessages(stats.toJson({}, true));
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+ var isSuccessful = !messages.errors.length && !messages.warnings.length;
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+ var showInstructions = isSuccessful && (isInteractive || isFirstCompile);
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+
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+ if (isSuccessful) {
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+ console.log(chalk.green('Compiled successfully!'));
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+ }
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+
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+ if (showInstructions) {
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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('To create a production build, use ' + chalk.cyan(cli + ' run build') + '.');
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+ console.log();
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+ isFirstCompile = false;
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+ }
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+
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+ // If errors exist, only show errors.
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+ if (messages.errors.length) {
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+ console.log(chalk.red('Failed to compile.'));
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+ console.log();
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+ messages.errors.forEach(message => {
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+ console.log(message);
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+ console.log();
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+ });
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+ return;
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+ }
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+
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+ // Show warnings if no errors were found.
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+ if (messages.warnings.length) {
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+ console.log(chalk.yellow('Compiled with warnings.'));
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+ console.log();
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+ messages.warnings.forEach(message => {
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+ console.log(message);
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+ console.log();
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+ });
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+ // Teach some ESLint tricks.
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+ console.log('You may use special comments to disable some warnings.');
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+ console.log('Use ' + chalk.yellow('// eslint-disable-next-line') + ' to ignore the next line.');
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+ console.log('Use ' + chalk.yellow('/* eslint-disable */') + ' to ignore all warnings in a file.');
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+ }
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+ });
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+}
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+
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+// We need to provide a custom onError function for httpProxyMiddleware.
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+// It allows us to log custom error messages on the console.
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+function onProxyError(proxy) {
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+ return function(err, req, res){
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+ var host = req.headers && req.headers.host;
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+ console.log(
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+ chalk.red('Proxy error:') + ' Could not proxy request ' + chalk.cyan(req.url) +
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+ ' from ' + chalk.cyan(host) + ' to ' + chalk.cyan(proxy) + '.'
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+ );
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+ console.log(
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+ 'See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (' +
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+ chalk.cyan(err.code) + ').'
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+ );
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+ console.log();
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+
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+ // And immediately send the proper error response to the client.
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+ // Otherwise, the request will eventually timeout with ERR_EMPTY_RESPONSE on the client side.
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+ if (res.writeHead && !res.headersSent) {
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+ res.writeHead(500);
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+ }
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+ res.end('Proxy error: Could not proxy request ' + req.url + ' from ' +
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+ host + ' to ' + proxy + ' (' + err.code + ').'
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+ );
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+ }
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+}
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+
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+function addMiddleware(devServer) {
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+ // `proxy` lets you to specify a fallback server during development.
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+ // Every unrecognized request will be forwarded to it.
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+ var proxy = require(paths.appPackageJson).proxy;
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+ devServer.use(historyApiFallback({
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+ // Paths with dots should still use the history fallback.
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+ // See https://github.com/facebookincubator/create-react-app/issues/387.
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+ disableDotRule: true,
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+ // For single page apps, we generally want to fallback to /index.html.
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+ // However we also want to respect `proxy` for API calls.
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+ // So if `proxy` is specified, we need to decide which fallback to use.
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+ // We use a heuristic: if request `accept`s text/html, we pick /index.html.
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+ // Modern browsers include text/html into `accept` header when navigating.
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+ // However API calls like `fetch()` won’t generally accept text/html.
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+ // If this heuristic doesn’t work well for you, don’t use `proxy`.
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+ htmlAcceptHeaders: proxy ?
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+ ['text/html'] :
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+ ['text/html', '*/*']
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+ }));
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+ if (proxy) {
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+ if (typeof proxy !== 'string') {
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+ console.log(chalk.red('When specified, "proxy" in package.json must be a string.'));
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+ console.log(chalk.red('Instead, the type of "proxy" was "' + typeof proxy + '".'));
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+ console.log(chalk.red('Either remove "proxy" from package.json, or make it a string.'));
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+ process.exit(1);
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+ }
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+
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+ // Otherwise, if proxy is specified, we will let it handle any request.
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+ // There are a few exceptions which we won't send to the proxy:
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+ // - /index.html (served as HTML5 history API fallback)
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+ // - /*.hot-update.json (WebpackDevServer uses this too for hot reloading)
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+ // - /sockjs-node/* (WebpackDevServer uses this for hot reloading)
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+ // Tip: use https://jex.im/regulex/ to visualize the regex
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+ var mayProxy = /^(?!\/(index\.html$|.*\.hot-update\.json$|sockjs-node\/)).*$/;
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+
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+ // Pass the scope regex both to Express and to the middleware for proxying
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+ // of both HTTP and WebSockets to work without false positives.
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+ var hpm = httpProxyMiddleware(pathname => mayProxy.test(pathname), {
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+ target: proxy,
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+ logLevel: 'silent',
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+ onProxyReq: function(proxyReq) {
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+ // Browers may send Origin headers even with same-origin
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+ // requests. To prevent CORS issues, we have to change
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+ // the Origin to match the target URL.
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+ if (proxyReq.getHeader('origin')) {
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+ proxyReq.setHeader('origin', proxy);
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+ }
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+ },
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+ onError: onProxyError(proxy),
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+ secure: false,
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+ changeOrigin: true,
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+ ws: true,
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+ xfwd: true
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+ });
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+ devServer.use(mayProxy, hpm);
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+
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+ // Listen for the websocket 'upgrade' event and upgrade the connection.
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+ // If this is not done, httpProxyMiddleware will not try to upgrade until
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+ // an initial plain HTTP request is made.
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+ devServer.listeningApp.on('upgrade', hpm.upgrade);
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+ }
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+
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+ // Finally, by now we have certainly resolved the URL.
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+ // It may be /index.html, so let the dev server try serving it again.
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+ devServer.use(devServer.middleware);
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+}
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+
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+function runDevServer(host, port, protocol) {
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+ var devServer = new WebpackDevServer(compiler, {
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+ // Enable gzip compression of generated files.
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+ compress: true,
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+ // Silence WebpackDevServer's own logs since they're generally not useful.
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+ // It will still show compile warnings and errors with this setting.
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+ clientLogLevel: 'none',
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+ // By default WebpackDevServer serves physical files from current directory
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+ // in addition to all the virtual build products that it serves from memory.
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+ // This is confusing because those files won’t automatically be available in
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+ // production build folder unless we copy them. However, copying the whole
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+ // project directory is dangerous because we may expose sensitive files.
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+ // Instead, we establish a convention that only files in `public` directory
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+ // get served. Our build script will copy `public` into the `build` folder.
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+ // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
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+ // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
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+ // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
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+ // Note that we only recommend to use `public` folder as an escape hatch
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+ // for files like `favicon.ico`, `manifest.json`, and libraries that are
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+ // for some reason broken when imported through Webpack. If you just want to
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+ // use an image, put it in `src` and `import` it from JavaScript instead.
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+ contentBase: paths.appPublic,
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+ // Enable hot reloading server. It will provide /sockjs-node/ endpoint
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+ // for the WebpackDevServer client so it can learn when the files were
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+ // updated. The WebpackDevServer client is included as an entry point
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+ // in the Webpack development configuration. Note that only changes
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+ // to CSS are currently hot reloaded. JS changes will refresh the browser.
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+ hot: true,
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+ // It is important to tell WebpackDevServer to use the same "root" path
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+ // as we specified in the config. In development, we always serve from /.
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+ publicPath: config.output.publicPath,
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+ // WebpackDevServer is noisy by default so we emit custom message instead
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+ // by listening to the compiler events with `compiler.plugin` calls above.
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+ quiet: true,
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+ // Reportedly, this avoids CPU overload on some systems.
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+ // https://github.com/facebookincubator/create-react-app/issues/293
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+ watchOptions: {
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+ ignored: /node_modules/
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+ },
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+ // Enable HTTPS if the HTTPS environment variable is set to 'true'
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+ https: protocol === "https",
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+ host: host
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+ });
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+
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+ // Our custom middleware proxies requests to /index.html or a remote API.
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+ addMiddleware(devServer);
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+
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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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+
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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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+
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+ openBrowser(protocol + '://' + host + ':' + port + '/');
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+ });
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+}
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+
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+function run(port) {
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+ var protocol = process.env.HTTPS === 'true' ? "https" : "http";
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+ var host = process.env.HOST || 'localhost';
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+ setupCompiler(host, port, protocol);
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+ runDevServer(host, port, protocol);
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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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+
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+ if (isInteractive) {
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+ clearConsole();
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+ var existingProcess = getProcessForPort(DEFAULT_PORT);
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+ var question =
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+ chalk.yellow('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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+
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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(chalk.red('Something is already running on port ' + DEFAULT_PORT + '.'));
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+ }
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+});
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