WIP: provide typing default for optional typevar

Author: CoderJoshDK

disnake/ui/button.py

@@ -3,7 +3,17 @@
 from __future__ import annotations
 
 import os
-from typing import TYPE_CHECKING, Any, Callable, ClassVar, Optional, Tuple, TypeVar, Union, overload
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    ClassVar,
+    Optional,
+    Tuple,
+    TypeVar,
+    Union,
+    overload,
+)
 
 from ..components import Button as ButtonComponent
 from ..enums import ButtonStyle, ComponentType
@@ -17,18 +27,23 @@
 )
 
 if TYPE_CHECKING:
-    from typing_extensions import ParamSpec, Self
+    from typing_extensions import (
+        ParamSpec,
+        Self,
+        TypeVar,  # noqa: TC004
+    )
 
     from ..emoji import Emoji
     from .item import ItemCallbackType
     from .view import View
 
+    V_co = TypeVar("V_co", bound="Optional[View]", covariant=True, default=None)
 else:
     ParamSpec = TypeVar
+    V_co = TypeVar("V_co", bound="Optional[View]", covariant=True)
 
 B = TypeVar("B", bound="Button")
 B_co = TypeVar("B_co", bound="Button", covariant=True)
-V_co = TypeVar("V_co", bound="Optional[View]", covariant=True)
 P = ParamSpec("P")