server.js

import express from 'express'
import { createServer } from 'http'
import path from 'path'
import { Socket } from 'socket.io'
import { toBuffer } from 'qrcode'
import fetch from 'node-fetch'

function connect(conn, PORT) {
  let app = (global.app = express())
  console.log(app)
  let server = (global.server = createServer(app))
  // app.use(express.static(path.join(__dirname, 'views')))
  let _qr = 'invalid'

  conn.ev.on('connection.update', function appQR({ qr }) {
    if (qr) _qr = qr
  })

  app.use(async (req, res) => {
    res.setHeader('content-type', 'image/png')
    res.end(await toBuffer(_qr))
  })

  // let io = new Socket(server)
  // io.on('connection', socket => {
  //     let { unpipeEmit } = pipeEmit(conn, socket, 'conn-')
  //     socket.on('disconnect', unpipeEmit)
  // })

  server.listen(PORT, () => {
    console.log('App listened on port', PORT)
    if (opts['keepalive']) keepAlive()
  })
}

function pipeEmit(event, event2, prefix = '') {
  let old = event.emit
  event.emit = function (event, ...args) {
    old.emit(event, ...args)
    event2.emit(prefix + event, ...args)
  }
  return {
    unpipeEmit() {
      event.emit = old
    },
  }
}

function keepAlive() {
  const url = `https://${process.env.REPL_SLUG}.${process.env.REPL_OWNER}.repl.co`
  if (/(\/\/|\.)undefined\./.test(url)) return
  setInterval(
    () => {
      fetch(url).catch(console.error)
    },
    5 * 1000 * 60
  )
}

export default connect