Question get the "prefab base" of a variant via code

Hi everyone.

I'm working on an editor tool that will add a custom component on designated GameObjects, including applying the change to a prefab if necessary.

It works fine except if the prefab is a variant. In this case, my script will apply the changes to the variant but not the original prefab it's based on.

My script does the first option and I'm looking for the second.



Doesn't anybody knows how to get the "prefab base" of a variant via code?

I checked the PrefabUtility API but the documentation is very limited and I don't know what is the technical term for what I'm looking for.

Thanks