Fix module import

flake.nix

@@ -18,7 +18,9 @@
       nixosModule = { config, libS, ... }@args: {
         _module.args.libS = lib.mkOverride 1001 (nixos-modules.lib { inherit lib config; });
 
-        imports = (dir: map
+        imports = [
+          nixos-modules.nixosModules.default
+        ] ++ (dir: map
           (file: ./. + "/${dir}/${file}")
           # assume that the nixos-modules repo is already imported if libS exists
           (lib.remove (lib.optionalString (lib.hasAttr "libS" args) "default.nix") (ls dir))