From 740c156cd81ebea6a8ed3f2457f73d3c5cbb4989 Mon Sep 17 00:00:00 2001
From: Rapptz <rapptz@gmail.com>
Date: Fri, 11 Mar 2022 08:06:11 -0500
Subject: [PATCH] Allow Optional transformers to work at runtime

---
 discord/app_commands/transformers.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/discord/app_commands/transformers.py b/discord/app_commands/transformers.py
index 330932e5c..7c50bfabc 100644
--- a/discord/app_commands/transformers.py
+++ b/discord/app_commands/transformers.py
@@ -241,6 +241,11 @@ class _TransformMetadata:
     def __init__(self, metadata: Type[Transformer]):
         self.metadata: Type[Transformer] = metadata
 
+    # This is needed to pass typing's type checks.
+    # e.g. Optional[Transform[discord.Member, MyTransformer]]
+    def __call__(self) -> None:
+        pass
+
 
 async def _identity_transform(cls, interaction: Interaction, value: Any) -> Any:
     return value