# modules/audio/pipewire.nix
{ den, ... }:
{
  den.aspects.pipewire = {
    nixos = { pkgs, ... }: {
      services.pipewire.enable = true;
    };

    homeManager = { ... }: {
      # user-level config if needed
    };
  };
}

{ den, ... }:
{
  den.aspects.example =
    { host, user, ... }:
    {
      nixos = { pkgs, ... }: {
        # host.xRes, host.isMultiMonitor or false, host.isLaptop or false, etc.
        # Note: networking.hostName is set automatically by den._.hostname
      };

      homeManager = { osConfig, ... }: {
        # user.userName, user.homeDirectory, user.gitName, user.gitEmail, etc.
        # osConfig accesses the NixOS config (e.g. osConfig.fileSystems ? "/games")
        home.file."example".text = "hello ${user.userName}";
      };
    };
}

# modules/category/my-feature.nix
{ den, ... }:
{
  den.aspects.my-feature = {
    nixos = { pkgs, ... }: {
      services.myservice.enable = true;
    };

    homeManager = { pkgs, ... }: {
      programs.myservice.enable = true;
    };
  };
}

den.hosts.x86_64-linux = {
  mynewhost = {
    xRes = "1920";
    yRes = "1080";
    isLaptop = true;          # freeform — any attributes you want
    users.neonvoid = {};
  };
};

{ den, inputs, ... }:
{
  den.aspects.mynewhost = {
    includes = [
      # pick and choose aspects you want
      den.aspects.boot
      den.aspects.locale
      den.aspects.networking
      den.aspects.systemd
      den.aspects.users
      den.aspects.overlays
      den.aspects.nixsettings
      den.aspects.bluetooth
      den.aspects.kernel
      den.aspects.sops
      den.aspects.ly
      den.aspects.systempackages
    ];

    nixos = { lib, ... }: {
      imports = [ (inputs.self + "/hosts/mynewhost/hardware-configuration.nix") ];
      # hostname is set automatically from den._.hostname (host name = "mynewhost")
      # boot, hardware, networking specifics...
    };
  };
}

{ den, ... }:
{
  den.aspects.<username> = {
    includes = [
      den.aspects.zsh
      den.aspects.git
      # ... all aspects this user should have, look at neonvoid for full list
    ];

    nixos = { ... }: {
      # den._.define-user, den._.primary-user, and den._.user-shell handle
      # isNormalUser, shell, and wheel automatically — only add extras here
      users.users.<username> = {
        extraGroups = [ "audio" "video" "networkmanager" ];
      };
    };
  };
}

mynewhost = {
  users.<username> = {};
};