server.js

const Express = require('express');
const webpack = require('webpack');
const webpackDevMiddleware = require('webpack-dev-middleware');
const webpackHotMiddleware = require('webpack-hot-middleware');
const config = require('./webpack.config');

const app = new Express();
const port = process.env.PORT || 3000;
const compiler = webpack(config);

app.use(webpackDevMiddleware(compiler, { noInfo: true, publicPath: config.output.publicPath }));
app.use(webpackHotMiddleware(compiler));

app.listen(port, (error) => {
  if (error) {
    console.error(error); // eslint-disable-line no-console
  } else {
    console.info(`Start demo at http://localhost:${port}`); // eslint-disable-line no-console
  }
});