add vars usage from ui package

[mihkeleidast]

This is just to demo an issue, breaks the build, so don't merge like this :)

Doing this breaks the build for both vite and next apps (also for a webpack app where i'm trying to get the same thing working). I'd guess that exporting and importing the vars from the ui package is quite an important feature for custom styles on the app side. Any thoughts on how to get this working?

[graup]

Hi, this is interesting. I definitely have importing vars working in my own project. I'll investigate what's going on here!