Initialize express without webpack

server.dev.js

const express = require('express');
// Chalk was added by create-react-app, use only on the dev side
const chalk = require('chalk');

// Initialize express
const app = express();
const PORT = process.env.PORT || 3000;

// Start up our express server
app.listen(PORT, (error) => {
  if (error) throw error;

  console.log(chalk.green('Express app listening on port'), PORT);
});