text: { config, pkgs, ... }:
  
  {
    # List packages installed in system profile. To search by name, run:
    # $ nix-env -qaP | grep wget
    environment.systemPackages =
      [ pkgs.vim
      ];
  
    # Use a custom configuration.nix location.
    # $ darwin-rebuild switch -I darwin-config=$HOME/.config/nixpkgs/darwin/configuration.nix
    # environment.darwinConfig = "$HOME/.config/nixpkgs/darwin/configuration.nix";
  
    # Auto upgrade nix package and the daemon service.
    # services.nix-daemon.enable = true;
    # nix.package = pkgs.nix;
  
    # Create /etc/bashrc that loads the nix-darwin environment.
    programs.zsh.enable = true;  # default shell on catalina
    # programs.fish.enable = true;
  
    # Used for backwards compatibility, please read the changelog before changing.
    # $ darwin-rebuild changelog
    system.stateVersion = 4;
  }
  