diff --git a/packages/types/src/core.ts b/packages/types/src/core.ts
index d8cfc8a24..7b98d0395 100644
--- a/packages/types/src/core.ts
+++ b/packages/types/src/core.ts
@@ -524,6 +524,7 @@ export type MappingTransformation<
   TSelectorReturn = SelectorReturn<TDestination>
 > = [
   mapFn: MemberMapReturn<TSource, TDestination, TSelectorReturn>,
+  isNullMetadata?: boolean,
   preCond?: PreConditionReturn<TSource, TDestination, TSelectorReturn>
 ];
 export type MappingProperty<