By "services" do you mean the ones you find on options page[1]? If yes, I never needed to dive into nixpkgs repo since that link provides every option + their e

By "services" do you mean the ones you find on options page[1]? If yes, I never needed to dive into nixpkgs repo since that link provides every option + their expected input types. [1]: https://search.nixos.org/options https://search.nixos.org/options