Use next-generation JavaScript, today, with Babel. Install gulp-babel if you want to get the pre-release of the next version of gulp-babel. See the Babel options, except for sourceMaps and filename which are handled for you. Also, keep in mind that options will be loaded from config files that apply to each file. Files in the stream are annotated with a babel property, which contains the metadata from babel.transform(). If you're attempting to use features such as generators, you'll need to add...