How to check if channel is empty?

[bstro]

What's the best way to determine if a channel is currently empty? The Buffer interface seems to describe an isEmpty method. But how do I get at the underlying buffer from a channel?

[Andarist]

Just yield flush(channel)

[bstro]

Thanks for the reply @Andarist; for my use case, I just need to know if the channel is empty, but not actually empty it.

[Andarist]

Well, you can always pass a buffer manually, so you have reference to it and you can check its isEmpty method

import { buffers } from 'redux-saga'
import { actionChannel } from 'redux-saga/effects'

function* saga() {
  const buffer = buffers.fixed() // or some other buffer type
  const chan = yield actionChannel('ACTION_TYPE', buffer)

  if (buffer.isEmpty()) {
     //...  
  }
}

[bstro]

Perfect. Thanks!!