Cannot subscribe async on 'backend' event

[vedadeepta]

branch: react-router-v4-fix

Issue.
It throws error :
uncaught: { ReplyError: ERR only (P)SUBSCRIBE / (P)UNSUBSCRIBE / PING / QUIT allowed in this context

Code :

  shareDbServer(
    {
      getHead: getHead,
      appRoutes: {
        main: getMainRoutes()
      },
      beforeStart: beforeStart
    },
    (ee, options) => {
      ee.on('backend', async (backend) => {
        let model = backend.createModel()
        let $files = model.query('files', {})
        console.log(model.subscribeAsync)
        await model.subscribeAsync($files)
        model.destroy()
      })
    }
  )

It throws an error in line await model.subscribeAsync($files)

Quick Fix:
put the code in setTimeout.