feat: try rework

validation/service/common.nix

@@ -0,0 +1,34 @@
+let
+  ensureAttrset = context: value:
+    if builtins.isAttrs value then
+      value
+    else
+      throw "${context} must be an attrset.";
+
+  ensureString = context: value:
+    if builtins.isString value then
+      value
+    else
+      throw "${context} must be a string.";
+
+  ensureNonEmptyString = context: value:
+    if builtins.isString value && value != "" then
+      value
+    else
+      throw "${context} must be a non-empty string.";
+
+  ensureInt = context: value:
+    if builtins.isInt value then
+      value
+    else
+      throw "${context} must be an int.";
+
+  ensureList = context: value:
+    if builtins.isList value then
+      value
+    else
+      throw "${context} must be a list.";
+in
+rec {
+  inherit ensureAttrset ensureString ensureNonEmptyString ensureInt ensureList;
+}