CoffeeScript

CoffeeScript (link) is a language similar to Ruby and Python, that compiles into JavaScript. There is even a JavaScript version of the compiler which allows "text/coffeescript" script types inside HTML documents.

Mindscape has a free Web Workbench (link) Visual Studio extension that transparently parses CoffeeScript code into JavaScript.

• See The Little Book on CoffeeScript (link).
• Compiling JavaScript to CoffeeScript -> js2coffee.
• Modules in CoffeeScript (link).

WebStorm

WebStorm has support for CoffeeScript implemented as a file watcher. The default arguments are

--map --compile $FileName$