You just reminded me of a really good point. We already have "previous examples" of people trying to make CSS tooling in another language! sass was written in

You just reminded me of a really good point. We already have "previous examples" of people trying to make CSS tooling in another language! sass was written in ruby originally, and it sucked so much to manage and work with for many devs that they literally re-wrote the ENTIRE thing in Dart so they could gain the benefits of the JS ecosystem (like npm)! It isn't a compiled language, but it is an example of someone having done this at least once, and ending up regretting it to the point that they spent multiple years rewriting it in a language that compiles to JS and deprecated the ruby version.