Having types of some sort helps me greatly in just writing functions, because it makes it much easier to remember just what data I'm messing around with. But I do tend to a functional/data-first style. So it reduces cognitive load way before you get to using tests/compiler to check things. And so, in fact, if your types are wrong your function/data manipulation will go wrong when you write it and a compiler/running tests are secondary things.
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If you have reliable enough tests, sure. And to be clear, I still think TS is a huge improvement over JS.
Having types of some sort helps me greatly in just writing functions, because it makes it much easier to remember just what data I'm messing around with. But I do tend to a functional/data-first style. So it reduces cognitive load way before you get to using tests/compiler to check things. And so, in fact, if your types are wrong your function/data manipulation will go wrong when you write it and a compiler/running tests are secondary things.