feature: _index.less

Syntax can be different, it’s the concept that is important, originally mentioned by @lukeapage here:https://github.com/cloudhead/less.js/issues/1181#issuecomment-13546979. This isn’t my concept, @lukeapage referenced the Stylus implementation, described here: http://learnboost.github.io/stylus/docs/import.html:

The idea is that a folder can contain a special “index” file, which references “sub-components”, mixin libs, or feature-subsets related to that library. It might be useful to think of this as having the ability to define dependencies.

./tablet
  |-- index.less
  |-- vendor.less
  |-- buttons.less
  |-- images.less

[matthew-dean]

Since this issue was raised again in #2879 recently, part of the question was around what libraries do now. Many of them use the same .less name as the folder name. So if there are search fallbacks, it might make sense to do:

@import "library";

1. Try to import “library.less”;
2. Try to import “library/library.less”;
3. Try to import “library/index.less”;

This would make a nicer shorthand for library imports than writing:

@import "library/library";

[stale[bot]]

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