server.js

var SERVER_PORT = 7000
var express = require('express');
var webpackDevMiddleware = require('webpack-dev-middleware');
var webpackHotMiddleware = require("webpack-hot-middleware");
var webpack = require('webpack');
var webpackConfig = require('./webpack.config.js');
var app = express();

var compiler = webpack(webpackConfig);

app.use(express.static(__dirname + '/dist'));

app.use(webpackDevMiddleware(compiler, {
  hot: true,
  filename: 'bundle.js',
  publicPath: '/',
  stats: {
    colors: true,
  },
  historyApiFallback: true,
}));

app.use(webpackHotMiddleware(compiler, {
  log: console.log,
  path: '/__webpack_hmr',
  heartbeat: 10 * 1000,
}));

var server = app.listen(SERVER_PORT, function() {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Example app listening at http://%s:%s', host, port);
});