Wonder how you deal with such scenario: ```Promise { resolve, _ -> resolve("a string") }.catch ...

# javascript

[Edoardo Luppi]

Wonder how you deal with such scenario:

Promise { resolve, _ ->
  resolve("a string")
}.catch {
  12
}.then {
  val v: Int = it
  println(v) // Expected an Int, but a string is received
}

[Big Chungus]

Sealed box class if you really must mix the types. Otherwise it's best to avoid mixing types in Promise

[Big Chungus]

Catch block is meant to provide a sensible default value, not an entirely different type.

[turansky]

catch call signature is invalid right now.
We will try to fix it here (with other Promise
problems).

In described example second then will receive data with type String | Int .

[Edoardo Luppi]

@Big Chungus that's reasonable! Thanks.
Although you know, it's something you need to be very careful about now.

@turansky oh nice. Although how are you representing String | Int? Any?

[turansky]

Comparable<*> expected

[turansky]

Draft implementation

[turansky]

Issue

[Edoardo Luppi]

Thanks @turansky!

[turansky]

Implemented 😉
Expected in next release (probably tomorrow).

[turansky]

Released in Kotlin Wrappers pre.585

[Edoardo Luppi]

Thanks @turansky! Awesome!