diff --git a/src/utils/mailbox.ts b/src/utils/mailbox.ts
index d642214..e5afc19 100644
--- a/src/utils/mailbox.ts
+++ b/src/utils/mailbox.ts
@@ -71,3 +71,4 @@ export class Mailbox {
     this.changed.emit()
   }
 }
+