Since Cursive works by analysing source code, for the most part everything that works for Clojure just works for CLJS too - navigation, refactorings etc. I'm planning to add very soon native support for CLJS REPLs, since getting them running can be pretty fiddly. And mid-term I'm planning a CLJS debugger with integrated REPL. That would also allow debugging CLJS in Electron shells or on devices when using React Native.