{
  description = "My Awesome Desktop Shell";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";

    ags = {
      url = "github:aylur/ags";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    { nixpkgs, ags, ... }:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
      layout =
        pkgs.writeText "layout.kdl"
          # kdl
          ''
            layout {
                pane {
                    pane name="command"
                    pane command="bash" {
                        name "ags"
                        args "-c" "wgo -file=.ts -file=.tsx -xfile=.d.ts -file=.scss ags run ./app.ts"
                    }
                }
            }
          '';
      devRunScript = pkgs.writeShellScriptBin "dev-run" ''
        zellij --layout ${layout} attach --create ags
      '';
      devStopScript = pkgs.writeShellScriptBin "dev-stop" ''
        killall gjs || true
        zellij delete-session --force ags || true
      '';
      agsPkg = ags.packages.${system};
    in
    {
      packages.${system} = {
        default = ags.lib.bundle {
          inherit pkgs;
          src = ./.;
          name = "ags-calendar";
          entry = "app.ts";

          # additional libraries and executables to add to gjs' runtime
          extraPackages = [
            # ags.packages.${system}.battery
            # pkgs.fzf
          ];
        };
      };

      devShells.${system} = {
        default = pkgs.mkShell {
          buildInputs = [
            devRunScript
            devStopScript
            pkgs.zellij
            pkgs.typescript
            pkgs.wgo
            # includes all Astal libraries
            # ags.packages.${system}.agsFull

            # includes astal3 astal4 astal-io by default
            (ags.packages.${system}.default.override {
              extraPackages = [
                # cherry pick packages
              ];
            })
          ];
        };
      };
    };
}