FFI Requires setTimeout

When using FFI for Aff I need to use setTimeout before calling onSuccess or else the page hangs as if onSuccess was never called. Feels like there is some listener setup in the wrong order or onSuccess is defined after the return.

Failing example without timeout.

exports.failing = s => (onError, onSuccess) => {
  onSuccess(s)
  return (cancelError, cancelerError, cancelerSuccess) => {cancelerSuccess()}
}

Working example with timeout.

exports.working = s => (onError, onSuccess) => {
  setTimeout(() => onSuccess(s), 100)
  return (cancelError, cancelerError, cancelerSuccess) => {cancelerSuccess()}
}

I cannot reproduce this with a modified version of the EffectFn test that always resolves immediately. I suspect that you have some sort of race condition in your code. Could you post a self contained example?

Created an example

https://github.com/BebeSparkelSparkel/aff-error

This is because you are typing it as Aff. Aff's representation is opaque. You need to type it as EffectFnAff and use the Compat module.

purescript-aff/src/Effect/Aff/Compat.purs

Lines 43 to 46 in 390857f

    
           -- | foreign import _myAff :: EffectFnAff String 
        
           -- | 
        
           -- | myAff :: Aff String 
        
           -- | myAff = fromEffectFnAff _myAff

Sorry about that. Just fixed it and am still having the same problem

	-- \| foreign import _myAff :: EffectFnAff String
	-- \|
	-- \| myAff :: Aff String
	-- \| myAff = fromEffectFnAff _myAff