TypeScript, all the way. I work with it professionally and I couldn't be happier, especially in comparison to CoffeeScript. I used to love CoffeeScript but, af

TypeScript, all the way. I work with it professionally and I couldn't be happier, especially in comparison to CoffeeScript. I used to love CoffeeScript but, after giving ES6 (with eslint) a shot, it no longer has a special place in my heart. I do enjoy the terseness of it (writing it is fun) but some things are just painful (reading it after the fact). As for TS vs ES6+ -- I would go with TS but only because Angular projects have a tendency to become very large, and having a compile-time type system hold your team's hand is very comforting.