nes-ai/server/server.js

const app = require('./app')
const Game = require('./game')

game = new Game()
game.start()

app.ws('/game', (ws, req) => {
  const send = (frame) => {
    try {
      ws.send(frame)
    } catch(err) {
      console.warn(err)
      teardown()
    }
  }
  const teardown = () => {
    console.log('Detaching')
    game.off('frame', send)
  }
  game.on('frame', send)
  ws.on('close', () => teardown)
})

app.listen().catch((err) => {
  console.log(err.toString())
  process.exit(1)
})