1) Don't concatenate them in the first place

2) Use TypeScript

Pro-tip, if the world is going JS and you don't get it, it's probably you.

With JS (TypeScript) I can develop on every platform natively (React Native).

I can compile to native code. (AssemblyScript).

I'm not saying you can't do those things on other languages, but JS is becoming a powerhouse thanks to it's ecosystem.

Also, you see many other communities like Rust copying lessons learned from web developers (React/Redux/etc)