IT WORKS

modules/dynamicism/submodule.nix

@@ -14,32 +14,15 @@ let
     mkEnableOption
     literalExpression
   ;
-  inherit (lib.types)
-    mkOptionType
-  ;
   t = lib.types;
 
   inherit (import ./lib.nix { inherit lib; })
+    convenientAttrPath
+    executablePathInStore
     recUpdateFoldl
   ;
 
   pkgs = host.pkgs;
-
-  /** Either a list of strings, or a dotted string that will be split. */
-  convenientAttrPath = t.coercedTo t.str (lib.splitString ".") (t.listOf t.str);
-
-  executablePathInStore = mkOptionType {
-    name = "exepath";
-    description = "executable path in the Nix store";
-    descriptionClass = "noun";
-    merge = lib.mergeEqualOption;
-    functor = lib.defaultFunctor "exepath";
-    check = x: if lib.isDerivation x then (
-      x.meta.mainProgram or null != null
-    ) else (
-      lib.pathInStore.check x
-    );
-  };
 in
 {
   options = {
@@ -74,8 +57,9 @@ in
     };
 
     configFile = mkOption {
-      type = t.pathInStore;
+      type = t.nullOr t.pathInStore;
       internal = true;
+      default = null;
     };
 
     unitDropins = mkOption {