From 0a13ae5f2aea56d986c3f595746ede15833a8284 Mon Sep 17 00:00:00 2001
From: hiro-nikaitou <vieteviete@proton.me>
Date: Sun, 12 Jul 2026 20:16:10 +0800
Subject: [PATCH] [Type] Fix alias type annotation on Attribute class

The alias attribute on Attribute instances is always resolved to str
before being exposed to users (via the class builder), so the type
should be str, not str | None.

Closes #1540
---
 src/attr/__init__.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/attr/__init__.pyi b/src/attr/__init__.pyi
index 758decf8f..ee9f2127f 100644
--- a/src/attr/__init__.pyi
+++ b/src/attr/__init__.pyi
@@ -136,7 +136,7 @@ class Attribute(Generic[_T]):
     type: type[_T] | None
     kw_only: bool
     on_setattr: _OnSetAttrType
-    alias: str | None
+    alias: str
 
     def evolve(self, **changes: Any) -> "Attribute[Any]": ...