server.js

'use strict';
require('babel-core/register');
let env  = process.env.NODE_ENV || 'development';
let path = require('path');
let express = require('express');

const PORT = process.env.PORT || 4001;

let app = express();

if(env === 'development') {
  let webpack = require('webpack');
  let config = require('./webpack.config.dev');
  let compiler = webpack(config);

  app.use(require('webpack-dev-middleware')(compiler, {
    noInfo: true,
    publicPath: config.output.publicPath,
  }));

  app.use(require('webpack-hot-middleware')(compiler));
}

// Allows for the use of other static resources
app.use('/dist', express.static('dist'));

app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname,'index.html'));
});

app.listen(PORT, (err) => {
  if (err) {
    console.log(err);
    return;
  }

  console.log(`Listening at port ${PORT}`);
});