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[JS] Support for AsyncIterator protocol #4336

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Merged
MangelMaxime merged 4 commits into from
Mar 5, 2026
Merged

[JS] Support for AsyncIterator protocol #4336

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8e93095
[JS] Support for AsyncIterator protocol https://developer.mozilla.org…
Lanayx Jan 19, 2026
eff62b0
Removed Symbol module as not used
Lanayx Jan 19, 2026
2e6c61e
Made argument of return and throw non-optionable
Lanayx Jan 19, 2026
5052adf
chore: update changelog
MangelMaxime Mar 5, 2026
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1 change: 1 addition & 0 deletions src/Fable.Core/CHANGELOG.md
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Expand Up @@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
### Added

* [Python] Added collection protocol markers and interfaces for Python interop (by @dbrattli)
* [JS] Add `AsyncIterator`, `AsyncGenerator`, and `IteratorResult` interfaces for the AsyncIterator protocol (by @Lanayx)

### Fixed

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16 changes: 16 additions & 0 deletions src/Fable.Core/Fable.Core.JS.fs
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Expand Up @@ -395,6 +395,22 @@ module JS =
and [<AllowNullLiteral>] AsyncIterable<'T> =
inherit AsyncIterable

[<Emit("$0[Symbol.asyncIterator]()")>]
abstract asyncIterator: unit -> AsyncIterator<'T>

and [<AllowNullLiteral>] IteratorResult<'T> =
abstract value: 'T with get, set
abstract ``done``: bool with get, set

and [<AllowNullLiteral>] AsyncIterator<'T> =
abstract next: unit -> Promise<IteratorResult<'T>>
abstract ``return``: value: 'T -> Promise<IteratorResult<'T>>
abstract throw: e: obj -> Promise<IteratorResult<'T>>

and [<AllowNullLiteral>] AsyncGenerator<'T> =
inherit AsyncIterator<'T>
inherit AsyncIterable<'T>

and [<AllowNullLiteral>] Promise<'T> =
abstract ``then``: ?onfulfilled: ('T -> 'TResult) * ?onrejected: (obj -> 'TResult) -> Promise<'TResult>

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