Re:Announcing TypeScript 1.0
by lmm on Thursday April 03, 2014 @04:38AM
(#7521619)
It has a somewhat nicer syntax for functions and better scoping rules, but you could certainly get that from a more lightweight js extension like coffeescript yeah.
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Not exactly, there is still type inference mechanism at work which, combined with DefinitelyTyped (https://github.com/borisyankov/DefinitelyTyped) declarations will get you quite a lot type safety even if you won't write any type declaration by yourself.