@gqlMutation with custom return type is incorrectly generated

[Swahvay]

I have a custom GQL mutation:

@gqlMutation({
  class: 'RootResolver',
  name: 'loginWithApple',
  async: true,
  type: 'ThirdPartyLogin',
  args: [gqlContextType(), { name: 'identityToken', type: GraphQLString }],
})

With ThirdPartyLogin defined like this:

@gqlObjectType()
export class ThirdPartyLogin {
  constructor(token: string, newAccount: boolean) {
    this.token = token;
    this.newAccount = newAccount;
  }

  @gqlField({
    name: 'token',
    class: 'ThirdPartyLogin',
    type: GraphQLString,
  })
  token: string;

  @gqlField({
    name: 'newAccount',
    class: 'ThirdPartyLogin',
    type: GraphQLBoolean,
  })
  newAccount: boolean;
}

But then generated graphQL type is this:

export const LoginWithAppleType: GraphQLFieldConfig<
  undefined,
  RequestContext<BarnlogViewer>,
  LoginWithAppleArgs
> = {
  type: new GraphQLNonNull(LoginWithApplePayloadType), // offending line
  args: {
    identityToken: {
      description: '',
      type: new GraphQLNonNull(GraphQLString),
    },
  },
  resolve: async (
    _source,
    args,
    context: RequestContext<BarnlogViewer>,
    _info: GraphQLResolveInfo,
  ) => {
    const r = new RootResolver();
    return r.loginWithApple(context, args.identityToken);
  },
};

LoginWithApplePayloadType is not actually a thing. It should be

- type: new GraphQLNonNull(LoginWithApplePayloadType),
+ type: new GraphQLNonNull(ThirdPartyLoginType),

I believe this is only a problem with mutations as fields seem to handle this correctly.