Well, TS does point things out to me in the IDE that make me correct it right there. But, I would have caught that in my browser in under 2 seconds anyway. With proper .map files to debug things it's infinitely more clear what's wrong than with TS's sometimes very cryptic messages.

As for your junior dev, maybe that makes the case for TS. But honestly, I've experienced junior TS developers who were simply overwhelmed by TS. They couldn't be trusted to write proper TS since they already struggled with JS. It just required us to review more code in their PRs.

I'll take a project with naming conventions, proper unit tests & code reviews over TS any day.