I'm using React in ES6 with Rails (the react-rails gem now uses Babel as its transpiler). What I've found is that I've had to choose between using ES6 and getting prerendering working correctly. I also couldn't get the ES6 modules working without RequireJS or CommonJS. If anyone has this figured out, I'd love to hear it.
Honestly I hate the react-rails gem. Whoever was maintaining it kept doing things at the whims of issue requestors. I remember one instance where they broke our apps with an upgrade because someone decided it would be a good idea to shim a definition for `window` into server prerenders. All because an issue creator who didn't really know what they were doing supposedly "needed" that to get browserify-rails working.
Examples are written in dusty JavaScript, but we've successfully used revelry_core with sprockets-es6 several times now.
EDIT: Still no modules yet. It doesn't help that Josh Peek deleted the old sprockets-es6 repo and all its issues before passing off maintenance to someone else.)
Very, actually. It's about time I add more tests, maybe remove its opinion about what view context to dump to JavaScript (leave that to the end dev), and version it as 1.0. I think it's had one significant bug in almost a year and no problem issues in the past 6 months.
Ha, so mere days after I told you it's stable I had to ship a fix to make sure that it was serving precompiled assets when they are available. We had never noticed because our server-side assets had never gotten large enough to go over Heroku's 60-second boot time limit. So anyway, if you're trying this out, please upgrade execjs-rails now. We cut our app's production boot time by roughly 80% by doing so.
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.
