void

lib/common/types/void_type.dart

@@ -0,0 +1,12 @@
+enum VoidType { all, item, unknown }
+
+extension VoidTypeX on VoidType {
+  String toStringType() => switch (this) {
+    VoidType.all => 'ALL',
+    VoidType.item => 'ITEM',
+    VoidType.unknown => 'unknown',
+  };
+
+  bool get isAll => this == VoidType.all;
+  bool get isItem => this == VoidType.item;
+}