server.js

const path = require('path');
const webpack = require('webpack');
const express = require('express');
const config = require('./webpack.config-dev');
const PORT = 3030;

const app = express();
const compiler = webpack(config);

// Enable CORS for all methods
app.use(function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

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

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

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

app.listen(PORT, function(err) {
  if (err) {
    return console.error(err);
  }

  console.log(`Listening at http://localhost:${PORT}/`);
});