The coffeescript compiler is written in coffeescript (and compiled to JS), so in order to serve a .coffee file you'll need to compile it, which requires JS. Th

The coffeescript compiler is written in coffeescript (and compiled to JS), so in order to serve a .coffee file you'll need to compile it, which requires JS. The commits add a dependency to the coffee-script[1] gem, which requires the execjs[2] gem, which requires some way of running JS. 1: https://github.com/josh/ruby-coffee-script https://github.com/josh/ruby-coffee-script 2: https://github.com/sstephenson/execjs https://github.com/sstephenson/execjs