diff --git a/synapse/rest/__init__.py b/synapse/rest/__init__.py
index e04af705eb..cebdeecb81 100644
--- a/synapse/rest/__init__.py
+++ b/synapse/rest/__init__.py
@@ -12,7 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Callable
from synapse.http.server import HttpServer, JsonResource
from synapse.rest import admin
@@ -62,6 +62,8 @@ from synapse.rest.client import (
if TYPE_CHECKING:
from synapse.server import HomeServer
+RegisterServletsFunc = Callable[["HomeServer", HttpServer], None]
+
class ClientRestResource(JsonResource):
"""Matrix Client API REST resource.
diff --git a/synapse/types.py b/synapse/types.py
index 9d7a675662..fb72f19343 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -19,6 +19,7 @@ from collections import namedtuple
from typing import (
TYPE_CHECKING,
Any,
+ ClassVar,
Dict,
Mapping,
MutableMapping,
@@ -219,7 +220,7 @@ class DomainSpecificString(metaclass=abc.ABCMeta):
'domain' : The domain part of the name
"""
- SIGIL: str = abc.abstractproperty() # type: ignore
+ SIGIL: ClassVar[str] = abc.abstractproperty() # type: ignore
localpart = attr.ib(type=str)
domain = attr.ib(type=str)
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