server.js

/* eslint-disable */
var path = require('path');
var express = require('express');
var webpack = require('webpack');
var config = require('./webpack.config');

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

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

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

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

app.listen(4000, 'localhost', function(err) {
    if (err) {
        console.log(err);
        return;
    }

    console.log('Listening at http://localhost:3000');
});
/* eslint-enable */