Google's Closure tools have been able to do this for several years. It's mainly documented at https://github.com/google/closure-stylesheets/blob/master/README.m

Google's Closure tools have been able to do this for several years. It's mainly documented at https://github.com/google/closure-stylesheets/blob/master/README.md#renaming https://github.com/google/closure-stylesheets/blob/master/RE... but has counterparts in Closure Compiler, and Templates; for JS and HTML, respectively.