Callback is undefined on async/await function

Not sure this is a bug or not. It worked on my production environment right now (docker, node:7.7.0-alpine, async@2.1.5). Please guide me.

What version of async are you using? 2.3.0

Which environment did the issue occur in (Node version/browser version) 7.9.0

What did you do? Please include a minimal reproducable case illustrating issue.

const { eachSeries } = require('async')

eachSeries( 
  [1,2,3], 
  async (item, cb) => {   // <----- it works if remove ```async```
    console.log( 'item:', item )
    console.log( 'cb:', typeof(cb) )
    console.log()
    cb()
  }, 
  err => {
    console.log('err:', err)
  }
)

What did you expect to happen?

item: 1
cb: function

item: 2
cb: function

item: 3
cb: function

err: null

What was the actual result?

item: 1
cb: undefined

err: TypeError: cb is not a function

[wootsaejao]

Figured out that I have to use it this way:

const { eachSeries } = require('async')

eachSeries( 
  [1,2,3], 
  async item => {
    console.log( 'item:', item )
    console.log()
    Promise.resolve() // <-- instead of callback
  }, 
  err => {
    console.log('err:', err)
  }
)

Result:

item: 1

item: 2

item: 3

err: null

[aearly]

You are correct – the cb is no longer passed to async functions. (Changed in 2.3.0)

That final Promise.resolve() is not needed. For async functions, the return value becomes the result.