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That's one option (my favorite and the simplest to use).

But the "default" is annotated JS which is not dissimilar to how TS operates.

I prefer Flow's syntax and if it wasn't for the annoying "you have to run a server to check code" thing... I'd use it a lot more

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You can use `flow check`, but the server has the benefit of giving almost instant responses even on large code bases by only revalidating a subset of the project.

Yeah, there are ways to configure it to be better but it's just not... "nice" out of the box.

Which is sadly important - for something so optional.

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