server.js

require('babel-core/register');
require.extensions['.css'] = () => {
  return;
};

const path = require('path');
const express = require('express');
const webpack = require('webpack');
const dev = require('webpack-dev-middleware');
const hot = require('webpack-hot-middleware');
const config = require('./webpack.config.js');
const httpProxy = require('http-proxy');
const proxy = httpProxy.createProxyServer({
  // target: 'http://localhost:' + config.apiPort,
  target: 'http://localhost:9876'
});

const port = process.env.PORT || 3000;
const server = express();
global.__ENVIRONMENT__ = process.env.NODE_ENV || 'default';

// Otherwise errors thrown in Promise routines will be silently swallowed.
// (e.g. any error during rendering the app server-side!)
process.on('unhandledRejection', (reason, p) => {
  if (reason.stack) {
    console.error(reason.stack);
  } else {
    console.error('Unhandled Rejection at: Promise ', p, ' reason: ', reason);
  }
});

// Short-circuit the browser's annoying favicon request. You can still
// specify one as long as it doesn't have this exact name and path.
server.get('/favicon.ico', function(req, res) {
  res.writeHead(200, { 'Content-Type': 'image/x-icon' });
  res.end();
});

server.use(express.static(path.resolve(__dirname, 'dist')));
server.use('/static', express.static(path.resolve(__dirname, 'static')));

if (!process.env.NODE_ENV) {
  const compiler = webpack(config);

  server.use(dev(compiler, {
    publicPath: config.output.publicPath,
    stats: {
      colors: true,
      hash: false,
      timings: true,
      chunks: false,
      chunkModules: false,
      modules: false
    }
  }));
  server.use(hot(compiler));
}

server.use('/api', (req, res) => {
  proxy.web(req, res);
});

// added the error handling to avoid https://github.com/nodejitsu/node-http-proxy/issues/527
proxy.on('error', (error, req, res) => {
  if (error.code !== 'ECONNRESET') { console.error('proxy error', error); }
  if (!res.headersSent) { res.writeHead(500, {'content-type': 'application/json'}); }
  res.end(JSON.stringify({error: 'proxy_error', reason: error.message}));
});

server.get('*', require('./app').serverMiddleware);

server.listen(port, (err) => {
  if (err) console.error(err);
  console.info(`⚡⚡⚡ Server running on http://localhost:${port}/`);
});