Type hint on_message decorator

pyrogram/client/methods/decorators/on_message.py

@@ -16,8 +16,11 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
 
+from typing import Tuple
+
 import pyrogram
 from pyrogram.client.filters.filter import Filter
+from pyrogram.client.handlers.handler import Handler
 from ...ext import BaseClient
 
 
@@ -45,7 +48,7 @@ class OnMessage(BaseClient):
                 The group identifier, defaults to 0.
         """
 
-        def decorator(func):
+        def decorator(func: callable) -> Tuple[Handler, int]:
             if isinstance(func, tuple):
                 func = func[0].callback