[jariel]

Yes, the market dictated that move, a non-TS JS may have fallen flat.

That said, it's MS, not some side project. They could feasibly take the road to 'pure TS' especially now that they have the core following and MS has some brand trust.

There's probably a huge following of folks that would jump on a Pure TS train as long as it wasn't cloistered by all the .Net legacy.

Like PureTS on Mono VM type thing.