From 98e42adeb8ff349c9c15145a0a0e85876c6012b2 Mon Sep 17 00:00:00 2001
From: Falko Schindler <falko@zauberzeug.com>
Date: Thu, 12 Dec 2024 09:19:59 +0100
Subject: [PATCH] mypy

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

diff --git a/nicegui/timer.py b/nicegui/timer.py
index c6d39a166..b71701bec 100644
--- a/nicegui/timer.py
+++ b/nicegui/timer.py
@@ -1,7 +1,7 @@
 import asyncio
 import time
 from contextlib import nullcontext
-from typing import Any, Awaitable, Callable, ContextManager
+from typing import Any, Awaitable, Callable, ContextManager, Optional
 
 from . import background_tasks, core
 from .awaitable_response import AwaitableResponse
@@ -33,7 +33,7 @@ def __init__(self,
         """
         super().__init__()
         self.interval = interval
-        self.callback = callback
+        self.callback: Optional[Callable[..., Any]] = callback
         self.active = active
         self._is_canceled = False
         self._immediate = immediate