diff -r 6ed7ee9f44db -r 3f618484eeb6 mercurial/transaction.py
--- a/mercurial/transaction.py	Tue Feb 01 15:14:05 2022 +0100
+++ b/mercurial/transaction.py	Mon Jan 31 19:28:58 2022 +0100
@@ -229,6 +229,10 @@
         if self._journal:
             self._abort()
 
+    @property
+    def finalized(self):
+        return self._finalizecallback is None
+
     @active
     def startgroup(self):
         """delay registration of file entry