github/linguist — pull request #669 by r0man (2013-09-03 19:37:43+00:00)
Title: Add the ".cljx" file extension to the list of Clojure languages.

Some people start writing portable Clojure/Clojurescript code and use
the ".cljx" file extension for that. This is driven by this project:

https://github.com/lynaghk/cljx