Example Play! Framework project which showcases automatic dependency import for Angular & RequireJS projects. Described here: Solving quadruple dependency injection problem.
I failed to find a way to add preprocessing to javascript files while still keeping sources in standard app/assets directory, thus javascript sources here are located in app/cilent directory and are compiled with preprocessor and injected into assets pipeline. As an unfortunate side effect, some plugins break - for example, in this template I had to place js-hint directly inside preprocessor, since standard plugin is coupled to app/assets directory.
jsdep script requires Node.js being present and runnable and depends on several Node.js libraries, which you can install by running npm install in root directory. After that, simple sbt run should start Play! server as usual.