index.js

const express = require('express');
const path = require('path');

const app = express();

// Serve only the static files form the dist directory
app.use(express.static(__dirname + '/dist/<name-of-app>'));

app.get('/*', (req, res) => {
  res.sendFile(path.join(__dirname + '/dist/<name-of-app>/index.html'));
});

// Start the app by listening on the default Heroku port
app.listen(process.env.PORT || 8080);