On Aug 20, 2013, at 2:31 AM, Tyler Romeo <tylerromeo(a)gmail.com> wrote: However if and when we adopt LESS support in core, which only happens if we also incorporate it into our MediaWiki coding conventions, complying extensions will, by convention, not be tolerated to use other pre-processors. However I agree that ResourceLoader in general should be agnostic and allow implementation and usage of whatever you want in your own extensions. From quickly looking at the draft patch set and the existing extension[1][2] that already implements this I we can conclude that this is already the case, and I'll hereby vouch for continued support of such extensibility for other pre-processors as well. However core should only (at most) include 1. -- Krinkle [1] https://www.mediawiki.org/wiki/Extension:Less [2] https://github.com/wikimedia/mediawiki-extensions-Less