How to do schema validation through lambda resolver?

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1

Good day, I’m trying to set up my own field validation using Lambda Webhooks for my entity. Here is the approximate code that I have:

@auth<ExtendedGraphQLEventFields, BlacklistFields>()
static async add({
  event,
  authHeader,
  respondWith,
}: Omit<WebHookGraphQLEvent, 'authHeader'> & {
  event: { add: addEventDgraph };
  authHeader: ExtendedAuthHeaderField;
  respondWith: (r: ResolverResponse) => void;
}): Promise<void> {
  try {
    const userRole: string =
      authHeader?.decodedToken?.['https://dgraph-app-frs-claims']?.role ??
      Roles.manager;

    console.log(userRole);

    const input = event?.add?.input;
    if (input) {
      interface IMember {
        active: boolean;
        isIndexed: boolean;
        name: string;
        slug: string;
        url: string & tags.Format<'url'>;
      }
      const validation: typia.IValidation<IMember> = typia.validate<IMember>(
        input[0]
      );

      if (!validation.success) {
        return respondWith([{ errors: ['Validation Error'] }]);
      }
    }
  } catch (e) {
    console.error(e);
  }
}

I searched for answers on the forum, but I’m not satisfied with the options with @custom or @lambda by field. As far as I understood, this Lambda Webhooks are executed after saving data in Dgraph. Has anyone encountered the same issue and found a solution?