Lightning Inheritance : overridden parent component methods?

Question

As I am reading this document on Aura inheritance:

https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/oo_whats_inherited.htm

Specifically around parent helper methods which can be overridden in child component. But no where in the documentation it mentions how do the actual implementation gets called.

Ex : cmp B extends cmp A. B overrides a method M present in A's helper.

How do I make some A's method call the B's version of M, instead of calling A's version.

Reading some articles its suggested to use : component.getConcreteComponent().getDef().getHelper().

Trying to find out : Is this acceptable way to call the overridden methods from Parent ?

Answer 1

The method you found is correct ( source1, source2 )

I don't find an alternative. Although if you are going to have multiple overridden methods on multiple classes, I suggest using an interface instead

Answer 2

Unfortunately this is no longer possible when LockerService is activated (optional in Summer '16 and enforced in Winter '17). Further discussions see here