Implementation Status

[jkrems]

I checked some of the engine/tool issue trackers and couldn't find any clear signal on what the status of the proposal is when it comes to stage 3 implementations. What I found so far:

• Babel: v7.19.0 (blog post). Babel is actively working on aligning with the latest revision, see Add 2022-03 decorators version (stage 3) babel/babel#14836.
• TypeScript: v5.0.0 (blog); metadata in v5.2.0 (blog).
• esbuild: v0.21.0; metadata in v0.21.3
• V8 has started work on accessors and decorators.
• Spidermonkey is (somwhat?) actively working on it.
• I couldn't find a signal from WebKit/JSC though I might have looked in the wrong place(s). @trusktr created https://bugs.webkit.org/show_bug.cgi?id=277593 which may be the most canonical bug.

Does that reflect the current status?

[nicolo-ribaudo]

I couldn't find a signal from Babel.

https://babeljs.io/blog/2022/02/02/7.17.0

[jkrems]

@nicolo-ribaudo Sorry, should've been more clear. I was thinking specifically about the proposal as it's now in stage 3. E.g. isPrivate is now private in the descriptor but (afaict) babel doesn't support this revision yet and I couldn't find an issue to implement it (see current test that still uses isPrivate).

[nicolo-ribaudo]

Have the isPrivate->private and isStatic->static changes already been presented to the committee for consensus?

[nicolo-ribaudo]

Ok, yes: babel/proposals#81 (comment)

[rektide]

Have the isPrivate->private and isStatic->static changes already been presented to the committee for consensus?

@nicolo-ribaudo #467 was merged, resolving.

[trusktr]

For the stumblers, stage 3 decorators landed in Babel on Sep 5th: https://babeljs.io/blog/2022/09/05/7.19.0 🎉 Here's a small guide on how to use them in TypeScript: microsoft/TypeScript#48885 (comment)

[JeanMeche]

It appears the new decorators won't land on TS before 5.0

[jkrems]

Thanks, updated the overview item to "after 4.9".

[woody-li]

https://bugzilla.mozilla.org/show_bug.cgi?id=1435869

[NullVoxPopuli]

Anyone know if Chrome or Safari have started implementation?

[justinfagnani]

Chrome seems to be making progress on auto accessors: https://issues.chromium.org/issues/42202709

[jkrems]

Updated the description with updated status for TypeScript and V8/Chrome. Also made it easier to skim for shipping versions and turned it into a checklist.

[transitive-bullshit]

esbuild also includes support for decorators: https://github.com/evanw/esbuild/releases/tag/v0.21.0 and decorator metadata: https://github.com/evanw/esbuild/releases/tag/v0.21.3