Thanks for the mention -- we're big fans of Ives and co!
VS Code has really done an incredible job and we're all benefiting from their work. One thing that we've done recently is add Language Servers on our containers. So when you boot up a language on Repl.it, say python/java/c++, we'll start a language server and that gives you kick-ass code intelligence: autocomplete, click-to-symbol, and some refactoring features: https://repl.it/blog/intel
I'm not a user nor related in any way. I just think they have an interesting story!