gistfile1.js

const cp = require('child_process')
const http = require('http')
const httpProxy = require('http-proxy')
const Promise = require('rsvp').Promise

const PROXY_PORT = 4201
const BROCCOLI_PORT = 4200

function startBroccoli() {
  return new Promise(function(resolve,reject) {
    console.log('Starting Broccoli')
    const broccoli = cp.spawn('node_modules/.bin/broccoli',['serve'])
    broccoli.stdout.setEncoding('utf8')
    broccoli.stdout.on("close", resolve)
    broccoli.stdout.on("data", function(data) {
      console.log(data)
      if(data.indexOf('Serving on') !== -1) {
        console.log('Broccoli started')
        resolve()
      }
    })
  })
}

function startProxy() {
  return new Promise(function(resolve,reject) {
    const proxy = httpProxy.createProxyServer({})

    const server = http.createServer(function(req, res) {
      const isNotStaticResource = req.url.indexOf('.') === -1
      if(isNotStaticResource) {
        req.url = 'http://localhost:' + PROXY_PORT + '/'
      }
      proxy.web(req, res, { target: 'http://localhost:' + BROCCOLI_PORT })
    })

    server.listen(PROXY_PORT)
    console.log('Proxy is listening on port ' + PROXY_PORT)
  })
}

startBroccoli().then(startProxy)