diff --git a/app/client/src/entities/DataTree/actionTriggers.ts b/app/client/src/entities/DataTree/actionTriggers.ts
index 0c345c1eac..b6cdc5edb5 100644
--- a/app/client/src/entities/DataTree/actionTriggers.ts
+++ b/app/client/src/entities/DataTree/actionTriggers.ts
@@ -173,7 +173,7 @@ export type PostMessageDescription = {
   payload: {
     message: any;
     targetOrigin: any;
-    transfer?: any;
+    transfer?: [any];
   };
 };
 
diff --git a/app/client/src/workers/Actions.ts b/app/client/src/workers/Actions.ts
index 5ace1af966..a574bd3b67 100644
--- a/app/client/src/workers/Actions.ts
+++ b/app/client/src/workers/Actions.ts
@@ -261,7 +261,7 @@ const DATA_TREE_FUNCTIONS: Record<
         };
       },
   },
-  postMessage: function(message: any, targetOrigin: any, transfer?: any) {
+  postMessage: function(message: any, targetOrigin: any, transfer?: [any]) {
     return {
       type: ActionTriggerType.POST_MESSAGE,
       payload: {