chore(Session): Add server instance for typings

Author: tony

libtmux/session.py

@@ -22,6 +22,7 @@
 
 if t.TYPE_CHECKING:
     from .pane import Pane
+    from .server import Server
 
 
 logger = logging.getLogger(__name__)
@@ -54,8 +55,10 @@ class Session(TmuxMappingObject, TmuxRelationalObject, EnvironmentMixin):
     child_id_attribute = "window_id"
     #: namespace used :class:`~libtmux.common.TmuxMappingObject`
     formatter_prefix = "session_"
+    #: :class:`libtmux.server.Server` session is linked to
+    server: "Server"
 
-    def __init__(self, server=None, **kwargs):
+    def __init__(self, server: "Server", **kwargs):
         EnvironmentMixin.__init__(self)
         self.server = server