Like what, a Swagger-based API? I haven't heard of anything like that, but I can how useful that would be.

like for completing methods on js/window, event classes, stuff like that. I hate having to task out to an MDN window

I'm using Conjure and had similar questions that I haven't yet found the answer to. Completion works, but docstring lookups don't. I found that adding [cljs.js :as js] to my require allowed for jumping to the function definition. Maybe something similar would help you with completion?

will try!

I wish I knew. That would be handy.