A modern programming language that makes developers happier.

kotlinlang

Anyone have a library or snippet they use to convert `suspend fun`s to a *cancelable* `Promise`?

There's a <https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/promise.html|promise builder> on `CoroutineScope`. Would using that and cancelling the scope meet your cancellability needs?

```GlobalScope.async {
      // ...
}.asPromise()```

Ah, but not sure what you mean by "cancelable". I don't see cancelation facility in Promise API.

Yeah I've definitely seen `asPromise` and `.promise` ! I think what we'd ideally want is some nice way to cancel the underlying scope that looks like idiomatic jS, rather than having to keep track of the `Promise` and  and scope the same time (similar to the way that most folks currently wrap coroutines in a suspendwrapper class for native)

If Kotlin weren't involved, what would the idiomatic JS you have in mind look like? You can probably wrap a `CoroutineScope` or a `CompletableDeferred` or something in a container with whatever JS API you're looking for, but I don't know what that is

Like <@U01CU4XA4UB> already said, promises are not cancelable. You can only implement cancelation by yourself: Add some extra parameter, cancel the inner suspend function and reject the promise.

Ah yeah I guess that lack of standardization for Promise cancelation is the problem

It looks like `AbortController` is the standard way to do this with `fetch` but its got experimental support…