TypeScript only implements JS features that make it to Stage 3, the only exception being decorators in the past which never went beyond Stage 2 in their previous form.

Those first draft decorators never made it past Stage 1. That's also why Typescript required a compile-time flag that began with `--experimental` before you could use them. It's amazing how many projects put an `--experimental` flag into Production code. (Thanks, Angular.)

It's essentially that but from C#

https://learn.microsoft.com/en-us/dotnet/csharp/language-ref...

> Nice, so this is the equivalent of `with` and context mangers in Python.

Well, half of it at least :)

Python has both enter and exit, while this proposal only has the exit half.

More importantly, it does not allow distinguishing between successful completion and a thrown exception. Which may or may not be such a great feature in the first place, but still.

TBF the `__enter__` hook is not the most useful.

The article mentions that this proposal is in stage 3 for Javascript, so will probably be refined a bit more https://tc39.es/process-document/

Things rarely change at all once they're at stage 3. That's why TS waits until that stage before implementing. There might be a minor tweak in some edge cases but stage 3 is usually "done".

Which is funny since Javascript had `with` before (that did something completely different) that was overly abused and thus removed.