I make it about 20 minutes into a JS project before I have to go install TS because I'm losing my mind. It's such a no-brainer that the question barely parses. Javascript is medieval and typescript is... less so.
I know it's not an interesting answer and a lot of other people say the same thing; guess I'm just casting my vote.
There was a time, once, when I did things with vanilla JavaScript. Not huge, ambitious things, but not trivial things either. Now TypeScript has ruined me. I'm pretty sure it didn't really mean to, but I've become so used to encountering `any` and saying "that needs to not be" and fixing it that now there's a reflex in my head that makes the thought of `any` just uncomfortable. I try to write vanilla and I start sweating, it just feels so unsafe.
I know it's not an interesting answer and a lot of other people say the same thing; guess I'm just casting my vote.