If you're interested in using ES6 features, TypeScript provides a great way to get most of these features (and of course optional typing as well). Babel might b

If you're interested in using ES6 features, TypeScript provides a great way to get most of these features (and of course optional typing as well). Babel might be slightly more feature-complete when it comes to ES6 features, but TypeScript provides such a fantastic front-end dev experience that I definitely recommend it. (Biggest pain point is incorporating typings for libraries which are pure JS and not TS.)