brunch (http://brunch.io http://brunch.io) provides this for backbone.js / eco / stylus - it merges multiple source files into a single deployable js (and css)

brunch (http://brunch.io http://brunch.io) provides this for backbone.js / eco / stylus - it merges multiple source files into a single deployable js (and css) file. Or you could use spine, which has this out of the box.