diff -r f1ef512e14ab -r 460e80488cf0 mercurial/dagop.py
--- a/mercurial/dagop.py	Tue Aug 20 17:46:17 2024 -0400
+++ b/mercurial/dagop.py	Tue Aug 20 18:30:47 2024 -0400
@@ -8,6 +8,9 @@
 
 import heapq
 import typing
+from typing import (
+    List,
+)
 
 from .thirdparty import attr
 
@@ -754,7 +757,7 @@
     return child
 
 
-def annotate(base, parents, skiprevs=None, diffopts=None):
+def annotate(base, parents, skiprevs=None, diffopts=None) -> List[annotateline]:
     """Core algorithm for filectx.annotate()
 
     `parents(fctx)` is a function returning a list of parent filectxs.