server-dev.js

const path = require('path');
const express = require('express');
const webpack = require('webpack');
const webpackMiddleware = require('webpack-dev-middleware');
const webpackHotMiddleware = require('webpack-hot-middleware');

const app = express();

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();
});

  const config = require('./webpack.config.dev.js');
  const compiler = webpack(config);
  const middleware = webpackMiddleware(compiler, {
    publicPath: config.output.publicPath,
    contentBase: 'src',
    stats: {
      colors: true,
      hash: false,
      timings: true,
      chunks: false,
      chunkModules: false,
      modules: false
    }
  });

  app.use(middleware);
  app.use(webpackHotMiddleware(compiler));
  app.get('*', function response(req, res) {
    res.write(middleware.fileSystem.readFileSync(path.join(__dirname, 'static/dist/index.html')));
    res.end();
  });

app.listen(process.env.WEB_SERVER_PORT, '0.0.0.0', function onStart(err) {
  if (err) {
    console.log(err);
  }
  console.info('==> 🌎 Listening on port %s. Open up http://0.0.0.0:%s/ in your browser.', process.env.WEB_SERVER_PORT, process.env.WEB_SERVER_PORT);
});