diff --git a/packages/sequelize/src/lib/types.ts b/packages/sequelize/src/lib/types.ts
new file mode 100644
index 000000000..e69de29bb
diff --git a/packages/types/src/plugin.ts b/packages/types/src/plugin.ts
index e99d05b8a..44d3cbfb2 100644
--- a/packages/types/src/plugin.ts
+++ b/packages/types/src/plugin.ts
@@ -54,6 +54,17 @@ export interface MapPlugin<TKey = unknown> {
     destinationObj?: TDestination
   ): [sourceInstance: TSource, destinationInstance: TDestination];
 
+  /**
+   * An optional post-map function to post-process the destination after map
+   *
+   * @param destination - a key to be used to identify the information about a particular Destination
+   * @param destinationObj - a plain object that takes the shape of the destination
+   */
+  postMap?<TDestination extends Dictionary<TDestination> = any>(
+    destination: TKey,
+    destinationObj?: TDestination
+  ): TDestination;
+
   /**
    * An optional pre-mapArray function to prepare the sourceArray before mapArray
    *