{
  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
  outputs =
    { self, nixpkgs }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "aarch64-darwin"
      ];
      forAllSystems = fn: nixpkgs.lib.genAttrs systems (system: fn nixpkgs.legacyPackages.${system});
    in
    {
      packages = forAllSystems (pkgs: {
        default = pkgs.buildGoModule {
          pname = "dnstt_exporter";
          version = "0.1.0";
          src = ./.;
          vendorHash = "sha256-+msAQqz07XVzGjpwi8PvlA7jP4Y+j/BgSZdnIc0LrpA=";

          subPackages = [ "cmd/dnstt_exporter" ];
        };
      });

      checks = forAllSystems (pkgs: {
        tests = self.packages.${pkgs.stdenv.hostPlatform.system}.default.overrideAttrs (_: {
          doCheck = true;
          checkPhase = ''
            runHook preCheck
            go test ./...
            runHook postCheck
          '';
        });
      });

      #checks = forAllSystems (
      #  pkgs:
      #  {
      #    tests = self.packages.${pkgs.stdenv.hostPlatform.system}.default.overrideAttrs (_: {
      #      pname = "nix-cache-login-tests";
      #      checkPhase = ''
      #        runHook preCheck
      #        go test ./...
      #        runHook postCheck
      #      '';
      #      doCheck = true;
      #    });
      #    module-checks = import ./module-checks.nix { inherit self pkgs; };
      #    devShell = self.devShells.${pkgs.stdenv.hostPlatform.system}.default;
      #  }
      #  // pkgs.lib.optionalAttrs pkgs.stdenv.isLinux {
      #    nixos-module = pkgs.testers.runNixOSTest (import ./nixos-test.nix self);
      #  }
      #);

      devShells = forAllSystems (pkgs: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            go
          ];
        };
      });

      nixosModules.default =
        {
          lib,
          pkgs,
          ...
        }:
        {
          imports = [ ./nixos-module.nix ];
          services.prometheus.exporters.dnstt.package =
            lib.mkDefault
              self.packages.${pkgs.stdenv.hostPlatform.system}.default;
        };

      nixosModules.dnstt-exporter = self.nixosModules.default;
    };
}