nixos/modules/options/system.nix

{
  config,
  lib,
  ...
}:
with lib;
let
  cfg = config.system;
in
{
  options.system = {
    locale = mkOption {
      type  = types.str;
      default = "en_US.UTF-8";
    };

    keyMap  = mkOption {
      type = types.str;
      default = "us";
    };

    timeZone = mkOption {
      type = types.str;
      default = "US/Eastern";
    };
  };
}