getKeyDependencies(obj, key)

Return the observable objects that provide input values to generate the computed value of the property key on Map-like object obj. If key does not have dependencies on obj, returns undefined. Otherwise returns an object with up to two keys: keyDependencies is a CIDMap that maps each Map-like object providing keyed values to an Array of the relevant keys; valueDependencies is a CIDSet that contains all Value-like dependencies providing their own values.

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

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

canReflect.getKeyDependencies(obj, "baz");  // -> { valueDependencies: CIDSet }