This is a description of when to use CoffeeScript in Titanium mobile.
I have built using the nodejs module Grunt.
git clone git://github.com/creationix/nvm.git ~/nvm
source ~/.nvm/nvm.sh
nvm install v0.9
nvm use v0.9
node --version
npm install -g coffee-script
coffee -v
npm install -g grunt
grunt --version
grunt
grunt watch
enjoy!!