@elia So I really want to be able to replace our coffee script with Opal and I think if I get to it early enough in this app it might be do able. I can’t figure out how to get the specs set up in my project though… Are you available to help? I’ve been working through @fkchang ’s example. Is there a way to configure opal-rspec to run the specs located inside an app/concepts/feature directory? I’m using Trailblazer to organize the backend into a component based architecture and it would be really nice if I could get all the specs inside the feature directories as well.