I think I saw someone ask about the backend, is that not planning on being supported or just only the front end now? Does it support js/react/ns.js?

Also, does that mean if I am working on a project live, my friend can watch and build with me in real-time and watch what I am typing and participate? Also, the plan says unlimited or some number of characters, 500 lines? Does that mean in total so I need to save and delete files, or can I build multiple projects as long as one workspace isn't too big? And one last question does the code compile run / you can run es lint / prettier on it etc.? :) I have been looking for something like this, so that's good if all these check out, and I can install npm packages as they come out, right?

Thank you,
Ronald