nixos-config/modules/system/boot-loader.nix

{
    config,
    lib,
    ...
}: {
    options.myConfig.boot-loader = {
        systemd-boot.enable = lib.mkEnableOption "";
        silent = lib.mkEnableOption "";
    };

    config = lib.mkMerge [
        (lib.mkIf config.myConfig.boot-loader.systemd-boot.enable {
            boot.tmp.cleanOnBoot = true;
            boot.loader = {
                systemd-boot = {
                    enable = true;
                    editor = false;
                    configurationLimit = 20;
                };
                efi.canTouchEfiVariables = true;
                timeout = 3;
            };
            systemd.watchdog.rebootTime = "10";
        })

        (lib.mkIf config.myConfig.boot-loader.silent {
            boot = {
                kernelParams = ["quiet" "rd.systemd.show_status=false" "rd.udev.log_level=3" "udev.log_priority=3"];
                consoleLogLevel = 3;
                initrd.verbose = false;
                initrd.systemd.enable = true;
            };
        })
    ];
}