Why doesn't CoffeScript compile to Sintra AssetPack?

Question

ruby

I'm using Sinatra AssetPack to manage assets in a modular Sinatra app. The gem does a great job with JS, but it doesn't compile CoffeeScript for me.
I added a line js :app, ['/js/app.coffee']to the AssetPack configuration inside app.rb , exactly as described in the AssetPack Readme on Github. Somehow the line <script src='app.coffee'></script>appears in index.slim , but the file is not accessible.
The coffee-script gem is listed in the Gemfile, Node and the coffee-script npm package are installed.
What am I doing wrong?

Answer 1

The settings line must be specified js :app, ['/js/app.js']despite the fact that the file has the .coffee extension .