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Just today i was bitten by a bug in a framework called NestJS that makes heavy use of decorators: Certain decorator they define doesnt work with Jest test framework.

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I use NestJS with Jest just fine. Lots of decorators, too. What bug did you encounter?

Sounds like you were bitten by Jest inadequacies, no?

Jest is inadequate because it doesn't support some non-standard experimental feature that was shoehorned into TypesScript to make it look more like C#?

This is a JavaScript feature and confusing the two makes finding answers to Typescript questions much harder.

But yes, I think jest, a "JavaScript testing framework designed to ensure correctness of any JavaScript codebase" should support JavaScript features, even the ones you don't like the provenance of.

But decorators aren't a JavaScript feature, that's the point of this comment thread.

Some form of them might eventually be a JavaScript feature, but anything using them now is potentially incompatible with that future form.

Oh yeah, sorry, I shouldn't have worded it that way. the decorators are being transpiled at runtime to standard JS, so why shouldn't tooling like jest be able to work with that?

Because there is something wrong happening while the transpilation of the non-standard feature is happening.

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