diff -r 5e568d70f54d -r f34887316f1f mercurial/interfaces/repository.py
--- a/mercurial/interfaces/repository.py	Mon Mar 06 13:22:47 2023 +0100
+++ b/mercurial/interfaces/repository.py	Mon Mar 06 13:30:41 2023 +0100
@@ -1524,6 +1524,10 @@
         """Name of the repoview that is active on this repo."""
     )
 
+    vfs_map = interfaceutil.Attribute(
+        """a bytes-key → vfs mapping used by transaction and others"""
+    )
+
     wvfs = interfaceutil.Attribute(
         """VFS used to access the working directory."""
     )