Add types to synapse.util.

synapse/util/async_helpers.py

@@ -31,6 +31,7 @@
     Set,
     TypeVar,
     Union,
+    cast,
 )
 
 import attr
@@ -268,7 +269,7 @@ def __init__(
         if not clock:
             from twisted.internet import reactor
 
-            clock = Clock(reactor)  # type: ignore[arg-type]
+            clock = Clock(cast(IReactorTime, reactor))
         self._clock = clock
         self.max_count = max_count
 

synapse/util/caches/lrucache.py

@@ -35,6 +35,7 @@
 from typing_extensions import Literal
 
 from twisted.internet import reactor
+from twisted.internet.interfaces import IReactorTime
 
 from synapse.config import cache as cache_config
 from synapse.metrics.background_process_metrics import wrap_as_background_process
@@ -341,7 +342,7 @@ def __init__(
         # Default `clock` to something sensible. Note that we rename it to
         # `real_clock` so that mypy doesn't think its still `Optional`.
         if clock is None:
-            real_clock = Clock(reactor)  # type: ignore[arg-type]
+            real_clock = Clock(cast(IReactorTime, reactor))
         else:
             real_clock = clock