# we use the yabai package from nix-darwin

  home.packages = [
    pkgs.yabai
  ];

{ pkgs, ... }:

# the package used comes from nix-darwin instead of home-manager.

{

{ ... }:

  home.packages = [
    pkgs.skhd
  ];

{

{ config, pkgs, ... }:
let
  userName = "<username>";
  homeDirectory = "/Users/<username>";
in {
  users.users."${userName}" = {
    name = "${userName}";
    home = "${homeDirectory}";
  };
  # this is responsible for hooking up all of our home-manager config
  home-manager.users."${userName}" = { pkgs, ... }: {
    imports = [ ../home.nix ];
  };
}

  imports = [ <home-manager/nix-darwin> ];

  imports = [ <home-manager/nix-darwin> ./local_config.nix];

  home-manager.users.christophercummings = { pkgs, ... }: {
    imports = [ ../nixpkgs/home.nix ];
  };

  home-manager.useUserPackages = true;
  home-manager.useGlobalPkgs = true;

  # services.yabai.package = pkgs.yabai;

  services.yabai.package = pkgs.yabai;

  # services.skhd.package = pkgs.skhd;

  services.skhd.package = pkgs.skhd;
  # services.emacs.enable = true;
  # services.emacs.package = config.home-manager.users.christophercummings.programs.emacs.package;

  # launchd.user.agents.syncemail = {
  #   command = "${pkgs.isync}/bin/mbsync -a && mu ${pkgs.mu}/bin/mu index";
  #   serviceConfig.StartInterval = 60 * 5;
  # };

  programs.zsh.enable = true;

  # enable launchd daemon for mbsync to sync and index emails if emails are configured in home-manager config
  launchd.user.agents.mbsync = if config.home-manager.users.christophercummings.accounts.email.accounts != {} then {
    command = "${pkgs.isync}/bin/mbsync -a && mu ${pkgs.mu}/bin/mu index";
    serviceConfig.StartInterval = 60 * 5;
  } else {};

  * create `darwin/local_config.nix` based on `darwin/example_local_config.nix`
    ``` shell
    cp ~/dotfiles/nixpkgs/darwin/example_local_config.nix ~/dotfiles/nixpkgs/darwin/local_config.nix
    ```
    * modify `darwin/local_config.nix` by adding the right user name and home directory

/nixpkgs/darwin/local_config.nix