From a504ac6100a577cbda1bedf80d69636603ee287c Mon Sep 17 00:00:00 2001
From: danieleades <33452915+danieleades@users.noreply.github.com>
Date: Mon, 18 Jul 2022 22:08:16 +0100
Subject: Improve static typing strictness (#10569)

---
 sphinx/util/parallel.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'sphinx/util/parallel.py')

diff --git a/sphinx/util/parallel.py b/sphinx/util/parallel.py
index 193d2a80d..e89418ad3 100644
--- a/sphinx/util/parallel.py
+++ b/sphinx/util/parallel.py
@@ -81,7 +81,9 @@ class ParallelTasks:
         logging.convert_serializable(collector.logs)
         pipe.send((failed, collector.logs, ret))
 
-    def add_task(self, task_func: Callable, arg: Any = None, result_func: Callable = None) -> None:  # NOQA
+    def add_task(
+        self, task_func: Callable, arg: Any = None, result_func: Optional[Callable] = None
+    ) -> None:
         tid = self._taskid
         self._taskid += 1
         self._result_funcs[tid] = result_func or (lambda arg, result: None)
-- 
cgit v1.2.1