Expose definitions in a bzl_library target

[Kernald]

Using Stardoc to document any macro wrapping rules/macros defined by rules_sass is tricky as it doesn't export a bzl_library target.

[jathak]

This is something that would be useful, but we don't have the bandwidth for it ourselves. Would you be interested in submitting a pull request?

[Kernald]

I gave it a quick try, but it's currently blocked by rules_nodejs - https://github.com/bazelbuild/rules_nodejs/issues/2874

Edit: ~there's a way to target individual files in the filegroup exposed by rules_nodejs, so that's actually not a blocker.~ some files depend on private ones so this isn't a solution either.