TypeScript's the first thing that's made JS tolerable, if I have to touch or use anyone else's JS code. It's pure misery, otherwise.

Writing solo and using no libraries, plain JS is... OK. Anything else, TS is the only thing that keeps me from hating life the whole time I'm working in JS.

FWIW I'm a huge curmudgeon who's usually (eventually) proven right when I hate some new thing that everyone else seems to think is great. TypeScript is wonderful.