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Re:Facebook Launches Flow, Static Type Checker for JavaScript by DougBTX on Tuesday November 18, 2014 @01:56PM (#8625579)
Yep, here's some related discussion: https://github.com/Microsoft/TypeScript/issues/185

tl;dr: they want to support both of those features, the question is what syntax to use and how to introduce those features into the existing ecosystem.

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