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Would it be possible for the maintainers of Typescript to provide an official stripper that could be deployed alongside new versions of Typescript, and then snapped in?

I'm not certain but I would be surprised if the TS and Node devs didn't discuss the functionality that's in Node now, since TS must have some definition of what an erasable type is (or rather, what few features aren't erasable, like enums), since the corresponding --erasableSyntaxOnly flag in TS was probably made specifically because of Node.

Its just stripping types, so new constructs should not matter - there is no parsing.

It uses swc under the hood.