haml_to_js is a ruby library and command line that converts haml to javascript. Why an other haml to js converter (see similar utilities) ? It is a extension of [haml_to_star](https://github.com/sdrdis/haml_to_star) which purpose is to convert haml into any language. This converter is intended for front usage. It simplifies debugging (the generated code is readable, a variable hold haml line number so you can know exactly where the problem is).