{
  description = "Finance Duck package and native NixOS service";

  # Kept independent of the host's Nixpkgs: this application needs Go >= 1.24.
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";

  outputs =
    { self, nixpkgs }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };
      package = pkgs.callPackage ./nix/package.nix { };
    in
    {
      packages.${system} = {
        default = package;
        finance-duck = package;
      };
      nixosModules.default = { lib, pkgs, ... }: {
        imports = [ ./nix/service.nix ];
        services.finance-duck.package =
          lib.mkDefault
            self.packages.${pkgs.stdenv.hostPlatform.system}.default;
      };
      checks.${system}.package = package;
      formatter.${system} = pkgs.nixfmt;
    };
}