[DaleSeo]

This brings all the empty-type work together in one PR behind a single experimentalAllowEmptyTypes flag. The flag covers the following spec proposals:

• Allow empty object types graphql-spec#1228
• Allow interfaces with no fields, unions with no members graphql-spec#1229
• Allow empty input object types graphql-spec#1249.

When the flag is enabled, the parser accepts {} in field and input field definitions. Validation also allows object, interface, and input object types with no fields, as well as union types with no members. OneOf input objects still need at least one field, since an empty OneOf input object can never have a valid value.

This supersedes #4862, #4863, and #4923. Those can be closed if this approach is preferred.

[vercel]

@DaleSeo is attempting to deploy a commit to the The GraphQL Foundation Team on Vercel.

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[martinbonnin]

Simple 👍 I like it.
It's also the route we took in Apollo Kotlin: apollographql/apollo-kotlin#7043