diff --git a/packages/rrweb/src/record/iframe-manager.ts b/packages/rrweb/src/record/iframe-manager.ts
index 377b7bc0ff..26985cc49a 100644
--- a/packages/rrweb/src/record/iframe-manager.ts
+++ b/packages/rrweb/src/record/iframe-manager.ts
@@ -235,6 +235,7 @@ export class IframeManager {
         }
       }
     }
+    return false;
   }
 
   private replace<T extends Record<string, unknown>>(
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index 8bca0959cc..d4584847ee 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -268,6 +268,7 @@ export type hooksParam = {
   canvasMutation?: canvasMutationCallback;
   font?: fontCallback;
   selection?: selectionCallback;
+  customElement?: customElementCallback;
 };
 
 // https://dom.spec.whatwg.org/#interface-mutationrecord