joefiorini/grunt-es6-module-transpiler — pull request #8 by eventualbuddha (2013-07-12 21:49:04+00:00)
Title: Fix mixed CoffeeScript and JavaScript configs.

If you happened to have a configuration that mixed CS and JS and had a JS file transpiled after a CS file then the JS file would be transpiled as if it were CS. This is because the options hash was being modified by the transpile task.