yui/yui3 — comment on commit a7e9ca67d735ae1bcdc1f7deb35ab98dd9c9f614
File: src/button/meta/button.json line 13
By ericf:

I see `button-core` more as a "private" module that we wouldn't expect anyone to actually `use()`. I think having `button-plugin` require `cssbutton` and not forcing `button-core` to require it, leaves open more flexibility.