/*** Copyright (c) Meta Platforms, Inc. and affiliates.** This source code is licensed under the MIT license found in the* LICENSE file in the root directory of this source tree.**/'use strict';
const babelRegister = require('@babel/register');
babelRegister({
ignore: [/[\\\/](build|server\/server|node_modules)[\\\/]/],
presets: [['react-app', {runtime: 'automatic'}]],
plugins: ['@babel/transform-modules-commonjs'],
});const express = require('express');
const compress = require('compression');
const {readFileSync} = require('fs');
const path = require('path');
const render = require('./render');
const {JS_BUNDLE_DELAY} = require('./delays');
const PORT = process.env.PORT || 4000;
const app = express();
app.use((req, res, next) => {
if (req.url.endsWith('.js')) {
// Artificially delay serving JS
// to demonstrate streaming HTML.
setTimeout(next, JS_BUNDLE_DELAY);
} else {
next();
}});app.use(compress());
app.get(
'/',
handleErrors(async function (req, res) {
await waitForWebpack();
render(req.url, res);
}));app.use(express.static('build'));
app.use(express.static('public'));
app.listen(PORT, () => {
console.log(`Listening at ${PORT}...`);
}).on('error', function (error) {
if (error.syscall !== 'listen') {
throw error;
}const isPipe = portOrPipe => Number.isNaN(portOrPipe);
const bind = isPipe(PORT) ? 'Pipe ' + PORT : 'Port ' + PORT;
switch (error.code) {
case 'EACCES':
console.error(bind + ' requires elevated privileges');
process.exit(1);
break;
case 'EADDRINUSE':
console.error(bind + ' is already in use');
process.exit(1);
break;
default:
throw error;
}});function handleErrors(fn) {
return async function (req, res, next) {
try {
return await fn(req, res);
} catch (x) {
next(x);
}};}async function waitForWebpack() {
while (true) {
try {
readFileSync(path.resolve(__dirname, '../build/main.js'));
return;
} catch (err) {
console.log(
'Could not find webpack build output. Will retry in a second...'
);await new Promise(resolve => setTimeout(resolve, 1000));
}}}