Hmm. I found it was always worth having a clean separation between frontend and business logic, so I would have built at least two modules anyway. I feel like if you want to smush together the frontend and backend pieces you can do that with node - they're both just javascript files in different folders, you only have one build process, and you just run "gulp run" or whatever during development - but I've only done that on one project so maybe I'm misremembering.