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> Flow is a different language than JS

How so? Isn't JS-with-Flow just JS with specially formatted comments?

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

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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