I don't know how if it will make it in es 6, but es.next does have a proposal 
that matches that syntax:
http://wiki.ecmascript.org/doku.php?id=strawman:guards

I have not seen anything about how one defines a guard. I assume it is whatever 
matches the instanceof for that class.

The real question is will there ever be a version of JS with annotations? I 
don't see any proposal on the ecmascript wiki about annotations (which is a 
little surprising as annotations would solve a lot of problems in angular and 
other applications).

Kamal.

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