If we're wild-assed guessing, mine is that TypeScript eventually merges with JavaScript. It is a wisely designed set of optional type constraints that aren't incompatible with JS proper. Seeing as how every conformant TypeScript compiler is also a conformant JavaScript compilers, the split is pretty small and eating one's vegetables is good for you.
(With one nit: TypeScript enums are weird and while they work in JavaScript ways they are weird and might be best off being rethought, even if it's backwards-incompatible.)
(With one nit: TypeScript enums are weird and while they work in JavaScript ways they are weird and might be best off being rethought, even if it's backwards-incompatible.)