diff --git a/packages/rrweb/src/record/iframe-manager.ts b/packages/rrweb/src/record/iframe-manager.ts
index 616c137856..d3c81d2a85 100644
--- a/packages/rrweb/src/record/iframe-manager.ts
+++ b/packages/rrweb/src/record/iframe-manager.ts
@@ -271,7 +271,6 @@ export class IframeManager implements IframeManagerInterface {
         }
       }
     }
-
     return false;
   }
 
diff --git a/packages/rrweb/src/record/observer.ts b/packages/rrweb/src/record/observer.ts
index e975062144..1174c8e1ce 100644
--- a/packages/rrweb/src/record/observer.ts
+++ b/packages/rrweb/src/record/observer.ts
@@ -1242,12 +1242,8 @@ function initCustomElementObserver({
   customElementCb,
 }: observerParam): listenerHandler {
   const win = doc.defaultView as IWindow;
-  if (!win || !win.customElements) {
-    return () => {
-      // do nothing
-    };
-  }
-
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
+  if (!win || !win.customElements) return () => {};
   const restoreHandler = patch(
     win.customElements,
     'define',