_service query should return non-nullable _Service type
dariuszkuc opened this issue · comments
Per the subgraph specification:
A new field must be added to the query root called _service. This field must return a non-nullable _Service type. The _service >field on the query root must return SDL which includes all of the service's types (after any non-federation transforms), as well as >federation directive annotations on the fields and types. The federation schema modifications (i.e. new types and directive >definitions) should not be included in this SDL.
Schema transformer currently creates the field returning nullable type
_service: _Service