There is a way to check union resolver's type conflict between Types on mergeTypeDefs

[mehdibeldjilali]

Hello,

I would like to know if it's possible to throw an error or have a warning on server side (when I call mergeTypeDefs) if union elements share the same resolver name but not the same type.

GraphQL Specification : http://spec.graphql.org/October2021/#SameResponseShape()

The mergeTypeDefs function doesn't throw an error even if ignoreFieldConflicts option or throwOnConflict option are set to true but in front you have an error like that :

Error: GraphQL error: Fields \"test\" conflict because they return conflicting types String and String!. Use different aliases on the fields to fetch both if this was intentional

Schema example :

type A {
  test: String
}

type B {
  test: String!
}

union C = A | B

I missing something, or it's not available on server side ?

Thanks !