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Re:Announcing TypeScript 1.5 by euroclydon on Monday July 20, 2015 @12:44PM (#9917234)
Thanks...

I found the closed issue:

https://github.com/Microsoft/TypeScript/issues/3203

And some docs from the contributor's branch:

https://github.com/RyanCavanaugh/jsx-intro

Nothing yet mentioned in the master's markdown. Do you know when the next TypeScript release is planned for which will include this?

Re:Announcing TypeScript 1.5 by jbrantly on Monday July 20, 2015 @12:53PM (#9917286)
TypeScript 1.6 will have this. Unknown release date but there is this: https://twitter.com/jntrnr/status/620607598903996417