Add a constant for receipt types (m.read). (#11531)

And expand some type hints in the receipts storage module.

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py

index f3039c3c3f..96f37e9f42 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -28,7 +28,7 @@ from typing import (
 import attr
 from prometheus_client import Counter
 
-from synapse.api.constants import AccountDataTypes, EventTypes, Membership
+from synapse.api.constants import AccountDataTypes, EventTypes, Membership, ReceiptTypes
 from synapse.api.filtering import FilterCollection
 from synapse.api.presence import UserPresenceState
 from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
@@ -1046,7 +1046,7 @@ class SyncHandler:
             last_unread_event_id = await self.store.get_last_receipt_event_id_for_user(
                 user_id=sync_config.user.to_string(),
                 room_id=room_id,
-                receipt_type="m.read",
+                receipt_type=ReceiptTypes.READ,
             )
 
             notifs = await self.store.get_unread_event_push_actions_by_room_for_user(