I've greatly enjoyed writing CoffeeScript, but am concerned that over the long term, it will fall behind javascript in terms of feature support.

The [Babel][1] transpiler (formerly 6to5) and tooling like Facebook's typechecker, [flow][2] have large teams and a rapid pace of development.

I don't want to miss out on cool features like generators, let/const, etc just for CoffeeScript's lovely bracket-less code.

[1]: https://babeljs.io/ [2]: http://flowtype.org/