I am not sure about this solution, as this would require users to write their own resolvers, which would cost too much work and introduce a lot of false negatives. And I would not expect majority of our users aware of this config and know how to write the resolver.

I would wish something more smart/automatic.

Maybe we should host the fs loading, to introduce a new option to set the relationship between files and icon conventions, where we augment FileSystemIconLoader internally, while still having the information for HMR.