chore(Pane): Add window, session, server instance for typings

Author: tony

libtmux/pane.py

@@ -6,10 +6,17 @@
 
 """
 import logging
+import typing as t
 
 from . import exc
 from .common import TmuxMappingObject, TmuxRelationalObject
 
+if t.TYPE_CHECKING:
+    from .server import Server
+    from .session import Session
+    from .window import Window
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -44,11 +51,14 @@ class Pane(TmuxMappingObject, TmuxRelationalObject):
 
     #: namespace used :class:`~libtmux.common.TmuxMappingObject`
     formatter_prefix = "pane_"
-
-    def __init__(self, window=None, **kwargs):
-        if not window:
-            raise ValueError("Pane must have ``Window`` object")
-
+    #: :class:`libtmux.window.Window` pane is linked to
+    window: "Window"
+    #: :class:`libtmux.session.Session` pane is linked to
+    session: "Session"
+    #: :class:`libtmux.server.Server` pane is linked to
+    server: "Server"
+
+    def __init__(self, window: "Window", **kwargs):
         self.window = window
         self.session = self.window.session
         self.server = self.session.server