change typing

nonebot/typing.py

@@ -1,13 +1,26 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+from abc import ABC
 from types import ModuleType
 from typing import TYPE_CHECKING
 from typing import Any, Set, List, Dict, Type, Tuple, Mapping
 from typing import Union, Optional, Iterable, Callable, Awaitable
 
+# import some modules needed when checking types
 if TYPE_CHECKING:
     from nonebot.adapters import BaseBot as Bot
     from nonebot.event import Event
 
+
+def overrides(InterfaceClass: ABC):
+
+    def overrider(func):
+        assert func.__name__ in dir(
+            InterfaceClass), f"Error method: {func.__name__}"
+        return func
+
+    return overrider
+
+
 Handler = Callable[["Bot", "Event", dict], Awaitable[None]]