Ecma262: Why don’t `Promise.{allSettled,all,race}` also support async iterators?

[ExE-Boss]

This is something that I’d expect to be supported, since Promise.{allSettled,all,race} return a Promise, so they’re essentially already asynchronous.

[bakkot]

It makes sense for all, but not so much allSettled or race (or any) - the expectation is that the promises returned by the async iterator settle in the order they're emitted (that's how async generators work, certainly), and that if one of them rejects then any subsequent promises just hold { done: true }.

It does not always make sense for promise-returning APIs which take iterables to also take async iterables.

Anyway, the iterator helpers proposal adds %AsyncIterator.prototype%.toArray(), which allows you to get a promise for a list out of an async iterator, which is a similar to what Promise.all does.

[bakkot]

Closing this as resolved, but @ExE-Boss if there's something else feel free to reopen.