We have an interface called Displayable dictating that types have a field called title. Now in the context of the federation, one API returns data from types that implement this interface (e.g. a Track), but it also defines a PageSection which also implements Displayable. The consequence of this is that the Displayable interface needs to be defined twice in the code, where in one of them, title needs to be marked as external.

The main difference is that title is provided by another API in the case of Track, while its meant to be provided by the current API in the case of PageSection.

federation_entities.py:

@strawberry.interface()
class Displayable:
    title: Optional[str] = strawberry.federation.field(external=True)

@strawberry.federation.type(extend=True, keys=["id"])
class Track(Displayable):
    id: strawberry.ID = strawberry.federation.field(external=True)

    @classmethod
    def resolve_reference(cls, id):
        return Track(id)



section_entities.py:

from federation_entities import Track
@strawberry.interface()
class Displayable:
    title: Optional[str]

@strawberry.type
class PageSection(Displayable):
    section_items: typing.List[Track]

This behaviour worked before the introduction of DuplicatedTypeName. But I'm not sure how to work around it now.