From 864c3f85b0c420f755a064a3c50a45716db3f8af Mon Sep 17 00:00:00 2001
From: reivilibre <oliverw@matrix.org>
Date: Fri, 16 Dec 2022 13:04:54 +0000
Subject: [PATCH] Improve type annotations for the helper methods on a
 `CachedFunction`. (#14685)

---
 changelog.d/14685.misc             | 1 +
 synapse/util/caches/descriptors.py | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)
 create mode 100644 changelog.d/14685.misc

diff --git a/changelog.d/14685.misc b/changelog.d/14685.misc
new file mode 100644
index 000000000..3ba227010
--- /dev/null
+++ b/changelog.d/14685.misc
@@ -0,0 +1 @@
+Improve type annotations for the helper methods on a `CachedFunction`.
\ No newline at end of file
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index 72227359b..81df71a0c 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -53,9 +53,9 @@ F = TypeVar("F", bound=Callable[..., Any])
 
 
 class CachedFunction(Generic[F]):
-    invalidate: Any = None
-    invalidate_all: Any = None
-    prefill: Any = None
+    invalidate: Callable[[Tuple[Any, ...]], None]
+    invalidate_all: Callable[[], None]
+    prefill: Callable[[Tuple[Any, ...], Any], None]
     cache: Any = None
     num_args: Any = None