devServer.js

import express from 'express';
import webpack from 'webpack';
import config from './webpack.config.dev';

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

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

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

app.use(express.static('static'));

app.listen(3e3, 'localhost', (err) => {
  if (err) {
    console.log(err);
    return;
  }

  console.log('Listening at http://localhost:3000');
});