Move old config here

lib/default.nix

@@ -1,7 +1,16 @@
 { pkgs }:
 
-with pkgs.lib; {
-  # Add your library functions here
-  #
-  # hexint = x: hexvals.${toLower x};
+with pkgs; {
+  mkBoolOpt = default: description: lib.mkOption {
+    inherit default;
+    inherit description;
+    type = lib.types.bool;
+    example = true;
+  };
+  mkPrivateVar = default: lib.mkOption {
+    inherit default;
+    readOnly = true; 
+    visible = false;
+
+  };
 }