I am learning how to use NestJs with GraphQL but I am stuck with validations. I had a CreatePostInput (Dto) with some validations using class-validator library but none of the validations work when I use a Resolver instead to a Controller to get the data. below you'll find some parts of the code, there is also a repo:

// main.ts
async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  app.useGlobalPipes(new ValidationPipe({transform: true}));
  await app.listen(process.env.PORT ?? 4000);
}
bootstrap();

// posts.resolver.ts
@Resolver(Post)
export class PostsResolver {
  constructor(private readonly todosService: PostsService) {}

  @Mutation(() => Post)
  async createPost(@Args("createPostInput") createPostInput: CreatePostInput) {
    return this.todosService.create(createPostInput);
  }
}

// post.entity.ts
@ObjectType()
export class Post {
  @Field(() => Int)
  id: number;

  @Field(() => String)
  title: string;

  @Field(() => String, { nullable: true })
  content?: string | null;

  @Field(() => Boolean)
  published: boolean
}

// create-post.input.ts
@InputType()
export class CreatePostInput {
  @Field(() => String)
  @IsString()
  @IsNotEmpty()
  title: string;

  @Field(() => String, { nullable: true })
  @IsOptional()
  @IsString()
  content?: string | null;
}

When I pass an invalid value to the CreatePostInput using a controller (POST) I get the errors from the validation and the status code (400). However when I make the query with invalid data (for example pass int value to string property) using grapql I get the error from GraqphQL (GraphQLError) without neither the validation formatted error nor status code.

I have searched info on the internet, watched YouTube videos, and read blogs but I haven't figured out what I'm missing or if I am doing something wrong. I would appreciate your help.