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Re:Announcing TypeScript 1.7 by pluma on Tuesday December 01, 2015 @07:39AM (#10654870)
That issue is back from when Babel was still called 6to5.

Babel didn't support JSX, decorators or type annotations. Now it does. Babel 6 is even more modular, lending itself even more to extension than Babel 5 did before.

There's nothing stopping MS from adding TS extensions to Babel.

Re:Announcing TypeScript 1.7 by Keats on Tuesday December 01, 2015 @08:29AM (#10655108)
I'm guessing Microsoft is not keen on starting from scratch for no visible benefits for them. You could try opening another issue to see if they changed their minds though