Traceur/AtScript Discussion Question: Decorators vs Annotations? (or both?)

[JeroMiya]

Crossing the streams a bit - the TypeScript proposal here (which is based on the Traceur/AtScript specification for annotations):
microsoft/TypeScript#1557 (comment)

Brought up some interesting discussion on the merits of annotations vs decorators. The discussion on the TypeScript issue seems to be leaning towards decorators, as envisioned in the TC-39 meeting notes:

https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-04/apr-10.md#decorators-for-es7
Tagging @wycats whom I believe is championing this feature for ES7, correct?

I think this might be an important discussion to have on the Traceur side as well. Is it feasible or desirable to have both annotations and decorators in the same language? Should Traceur be experimenting with decorators? Why or why not? I'd love to hear the Traceur/AtScript's take.

[arv]

Is it feasible or desirable to have both annotations and decorators in the same language?

No. We should pick one.

[JeroMiya]

What if decorators make it into the ES7 standard? As @EisenbergEffect has pointed out here (babel/babel#559 (comment)), decorators are being actively discussed for inclusion in the standard and AtScript style annotations are not (yet?).

[arv]

For Traceur we could do both until we pick one in TC39.

[zdychacek]

Decorators are already implemented in Babel. Is Traceur going to support them too?

https://github.com/wycats/javascript-decorators

[arv]

That was the plan. I don't have time to work on it... patches welcome.