Update mypy configuration: `no_implicit_optional = True` (#9742)

2 files changed, 6 insertions, 3 deletions

diff --git a/synapse/handlers/account_validity.py b/synapse/handlers/account_validity.py
index d781bb251d..bee1447c2e 100644
--- a/synapse/handlers/account_validity.py
+++ b/synapse/handlers/account_validity.py
@@ -18,7 +18,7 @@ import email.utils
 import logging
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
-from typing import TYPE_CHECKING, List
+from typing import TYPE_CHECKING, List, Optional
 
 from synapse.api.errors import StoreError, SynapseError
 from synapse.logging.context import make_deferred_yieldable
@@ -241,7 +241,10 @@ class AccountValidityHandler:
         return True
 
     async def renew_account_for_user(
-        self, user_id: str, expiration_ts: int = None, email_sent: bool = False
+        self,
+        user_id: str,
+        expiration_ts: Optional[int] = None,
+        email_sent: bool = False,
     ) -> int:
         """Renews the account attached to a given user by pushing back the
         expiration date by the current validity period in the server's
diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
index 2ad9b6d930..739653a3fa 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -1008,7 +1008,7 @@ class E2eKeysHandler:
         return signature_list, failures
 
     async def _get_e2e_cross_signing_verify_key(
-        self, user_id: str, key_type: str, from_user_id: str = None
+        self, user_id: str, key_type: str, from_user_id: Optional[str] = None
     ) -> Tuple[JsonDict, str, VerifyKey]:
         """Fetch locally or remotely query for a cross-signing public key.