Stylus - how to make a "global" mixin?

Question

css

Tell me how to make a mixin that does not need to be inserted into styles, make it global, ideally the whole computer?
Well, that is, it is used only when called and creates a code construction, and if not called, it does not exist.
You can, of course, put it in every project, but it still doesn’t appear until you call it, then why?