I'm using Sinatra AssetPack to manage assets in modular Sinatra application. It works great with JS files, but doesn't compiles CoffeeScript.
I've added line js :app, ['/js/app.coffee']
into AssetPack conf at app.rb, just like in AssetPack readme on Github. Somehow <script src='app.coffee'></script>
appends to index.slim, but file isn't accessible.
Gem coffee-script is listed in Gemfile, Node and coffee-script npm package are installed.
What I'm doing wrong?