> Does that include ES6 ? Yes. > What parts of JS do they consider a subset of typescript ? Everything that's standardized. > Can i keep my type declaration

> Does that include ES6 ? Yes. > What parts of JS do they consider a subset of typescript ? Everything that's standardized. > Can i keep my type declarations in a different file than my .js code like flow does ? Yes. > How far can i go with typescript until i need to use babel ? Pretty much as far as you want, although you may have to wait a little bit longer. BTW, stop inserting spaces before your punctuation. It's super aggravating.