From 9b2dbd2bffdc856d0db1cb4c8f099a48bf518338 Mon Sep 17 00:00:00 2001
From: Carson <cpsievert1@gmail.com>
Date: Tue, 7 Nov 2023 14:14:58 -0600
Subject: [PATCH] Small typing fix

---
 shinywidgets/_comm.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/shinywidgets/_comm.py b/shinywidgets/_comm.py
index fb6939d..d7c7e22 100644
--- a/shinywidgets/_comm.py
+++ b/shinywidgets/_comm.py
@@ -32,8 +32,8 @@ class ShinyComm:
     # we don't have a kernel here, so give it a meaningless value.
     kernel = "Shiny"
 
-    _msg_callback: MsgCallback
-    _close_callback: MsgCallback
+    _msg_callback: Optional[MsgCallback]
+    _close_callback: Optional[MsgCallback]
     _closed: bool = False
     _closed_data: Dict[str, object] = {}