{
  flake-file.inputs = {
    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=latest";
  };
  
  den.aspects = {
    nix-flatpak = {
      nixos = 
        { inputs, ... }:
        {
          imports = [
            inputs.nix-flatpak.nixosModules.nix-flatpak
          ];
          services = {
            flatpak = {
              enable = true;
              update.onActivation = false; # update when rebuild
            };
          };
        };
      homeManager = 
        { inputs, ... }:
        {
          imports = [
            inputs.nix-flatpak.homeManagerModules.nix-flatpak
          ];
          services = {
            flatpak = {
              enable = true;
              update.onActivation = false;
            };
          };
        };
      };
    };
}