Those of you that follow my blog might have noticed how fond I am to some of CoffeeScript's conveniences. They are excellent, but it's time to leave them behind and start using ES6. Most of CoffeeScript's goodies already exist in ES6 (with some syntax changes), and your code is guaranteed to be future proof. And if time spent learning CoffeeScript feels like a waste, there's good news - with a solid CoffeeScript base, transitioning to ES6 will be a piece of cake!
Avoid CoffeeScript and use ES6!