It's been a little while, but I have modules working using the browserify-rails gem which provides CommonJS support to sprockets via browserify. I use Babelify

It's been a little while, but I have modules working using the browserify-rails gem which provides CommonJS support to sprockets via browserify. I use Babelify for ES6 support and then Reactify for JSX support. I add a command line argument to browserify in my application.rb to do all the transforms--config.browserify_rails.commandline_options = ["-t babelify", "-t reactify"], and it spits out working ES6 React.