Grats author here. It's spiritually similar to type-graphql or typegql, except that it's able to see the TypeSCript types as well as the class/method names. So, there's less duplication, less overhead, and a less confusing API (specifying argument types and return in type-graphql for example is pretty confusing.

Unlike Pothos, this implementation-first approach is able to leverage simple type script names and types, whereas Pothos requires you to explicitly define all the names and types using their builder-pattern-for-graphql-SDL API.

More here on why Grats does not use decorators like type-graphql: https://grats.capt.dev/docs/faq/why-use-comments/