Using graphql-codegen to generate resolvers with __resolveType & __resolveReference

[SiNONiMiTY]

Title says, if anyone can help point me on how to generate types for these types of resolvers.

[SiNONiMiTY]

  codegen:
    overwrite: true
    emitLegacyCommonJSImports: false
    generates:
      ./src/types.d.mts:
        plugins: [
          typescript,
          typescript-resolvers,
        ]
        config:
          federation: true

This is my configuration

[SiNONiMiTY]

Found the answer for generating __resolveReference, there must be a @key directive on the type that I want to be resolved.

However, I am still missing on how to generate the __resolveType definition.

EDIT: It seems there must be Union or Interface types before codegen outputs the __resolveType definition.