This is correct. Move to TypeScript for the types. If all you want is the latest syntactic developments from ES, babel is a better fit. It tends to be further ahead than TS for the bleeding edge features.
You can even make your own definitions and syntax sugar using Babel. (If we continue to add more syntax sugar to JS, it will soon be more complicated then C++.)
You can as well in TypeScript, it's just never been promoted or talked about much. Which is a shame. When I get a decent chunk of free time I plan to play with it, I'm curious if it's possible to write a translation layer that would allow using babel plugins in TS.
