{ nixos = { config, lib, pkgs, ... }: let cfg = config.features.gaming; in { options.features.gaming.enable = lib.mkEnableOption "gaming"; config = lib.mkIf cfg.enable { programs.steam = { enable = true; remotePlay.openFirewall = true; dedicatedServer.openFirewall = true; localNetworkGameTransfers.openFirewall = true; }; environment.systemPackages = [ pkgs.prismlauncher ]; }; }; }