dev-server.js

var util = require('util');
var webpack = require('webpack');
var WebpackDevServer = require('webpack-dev-server');
var opn = require('opn');
var pkg = require('./package.json');

var port = pkg.config.devPort;
var host = pkg.config.devHost;

var configPath = process.argv[2] || './webpack/config';
var config = require(configPath);

var server = new WebpackDevServer(
  webpack(config),
  config.devServer
);

server.listen(port, host, function (err) {
  if (err) { console.log(err); }
  var url = util.format('http://%s:%d', host, port);
  console.log('Listening at %s', url);
  opn(url);
});