server.js

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

var app = new require('express')();
var port = process.env.PORT || 4000;

var compiler
try {
	compiler = webpack(config);
} catch (err) {
	console.log(err.message);
	process.exit();
}

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

app.use(function(req, res, next) {
  res.setHeader("Access-Control-Allow-Origin", "*");
  return next();
});

app.get("*", function(req, res) {
  res.sendFile(__dirname + '/index.html');
});

app.listen(port, function(error) {
  if (error) {
    console.error(error);
  } else {
    console.info("Webapp HMR server listening on port %s", port);
  }
});