My issue with typescript... and, correct me if I'm wrong... is it doesn't exist without Javascript. Typescript needs to be compiled down into Javascript to be run. It has no stand alone interpreter (that I'm aware of) and definitely not one baked into web browsers or NodeJS (or adjacent) tools. In essence, Typescript is jank sitting on top of and trying to fix Javascript's uber jank, simultaneously fracturing the webdev space while not offering itself as a true competitive and independent language for said space.

That's my amateur two cents for what it's worth.