It’s not. And trying to just be a transformation of the source to JS without its own standard library (mostly, some old stuff doesn’t follow this) means it really isn’t possible with just TS alone.

That’s OK with me. I use TS because I like it and hate the total lack of safety in JS. I have to use JS on the web, so TS it is.

If I don’t need it to run on a webpage, I wouldn’t be writing it in TS. I like other languages more overall.