Bootstrapping Angular Universal App

import * as express from 'express';
import { join } from 'path';

// These are important and needed before anything else
import 'zone.js/dist/zone-node';
import 'reflect-metadata';

import { ngExpressEngine } from '@nguniversal/express-engine';
import { provideModuleMap } from '@nguniversal/module-map-ngfactory-loader';

import { AppServerModuleNgFactory, LAZY_MODULE_MAP } from './dist/server/main';

const app = express();
const PORT = process.env.PORT || 4000;
const DIST_FOLDER = join(process.cwd(), 'dist');

// Set the engine
app.engine('html', ngExpressEngine({
    bootstrap: AppServerModuleNgFactory,
    providers: [
        provideModuleMap(LAZY_MODULE_MAP)
    ]
}));

app.set('view engine', 'html');
app.set('views', join(DIST_FOLDER, 'browser'));

// Server static files from /browser
app.get('*.*', express.static(join(DIST_FOLDER, 'browser'), {
    maxAge: '1y'
}));

// All regular routes use the Universal engine
app.get('*', (req, res) => {
    res.render('index', { req });
});

app.listen(PORT, () => {
    console.log(`Node Express server listening on http://localhost:${PORT}`);
});