alt Hacker NewsFunction return type inference is funny but I don't think it's that great of a feature. It makes it harder for a library's consumer to know how to properly use a function, and it also makes it harder for the maintainer to not break backwards compatibility inadvertently. Anyway, I'm all for experimenting.
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jitl • last Sunday at 10:28 PM
It’s great in TypeScript. In TypeScript your source can have inferred types returned, and then use a build step to produce resolved typings files (.d.ts) for distribution that have the fully specified type.
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There's nothing stopping a library author from explicitly annotating return types wherever a stable interface is important, the idea is more for smaller functions or callbacks to make use of this. Perhaps I'll make the examples clearer to reflect the intention.