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Re:Announcing TypeScript 1.7 by lukasm on Tuesday December 01, 2015 @05:39AM (#10654513)
because TypeScript is a super set of ES.
Re:Announcing TypeScript 1.7 by pluma on Tuesday December 01, 2015 @07:35AM (#10654852)
That would have been an argument when Babel was still 6to5.

Babel supports all kinds of extensions to ES including ES proposals and extensions like JSX or type annotations.