Add type hints to application services. (#8655)

synapse/handlers/auth.py

@@ -18,10 +18,20 @@ import logging
 import time
 import unicodedata
 import urllib.parse
-from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Union
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Dict,
+    Iterable,
+    List,
+    Optional,
+    Tuple,
+    Union,
+)
 
 import attr
-import bcrypt  # type: ignore[import]
+import bcrypt
 import pymacaroons
 
 from synapse.api.constants import LoginType
@@ -49,6 +59,9 @@ from synapse.util.threepids import canonicalise_email
 
 from ._base import BaseHandler
 
+if TYPE_CHECKING:
+    from synapse.app.homeserver import HomeServer
+
 logger = logging.getLogger(__name__)
 
 
@@ -149,11 +162,7 @@ class SsoLoginExtraAttributes:
 class AuthHandler(BaseHandler):
     SESSION_EXPIRE_MS = 48 * 60 * 60 * 1000
 
-    def __init__(self, hs):
-        """
-        Args:
-            hs (synapse.server.HomeServer):
-        """
+    def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
 
         self.checkers = {}  # type: Dict[str, UserInteractiveAuthChecker]