keyHasDependencies(obj, key)

Returns true if the computed value of the property key on Map-like object obj derives from other values. Returns false if key is computed on obj but does not have dependencies on other objects. If key is not a computed value on obj, returns undefined.

obj must implement @@can.keyHasDependencies to work with canReflect.keyHasDependencies.

var foo = new DefineMap({ "bar": "baz" })
var obj = new (DefineMap.extend({
     baz: {
       get: function() {
         return foo.bar;
       }
     },
     quux: {
         get: function() {
           return "thud";
         }
     }
}))();

canReflect.keyHasDependencies(obj, "baz");  // -> true
canReflect.keyHasDependencies(obj, "quux");  // -> false
canReflect.keyHasDependencies(foo, "bar");  // -> undefined