fix(typings) Move typing-extensions into TypeGuard (#572)

Resolves #571, follow up to #564.

Author: tony

CHANGES

@@ -15,6 +15,10 @@ $ pip install --user --upgrade --pre libtmux
 
 - _Future release notes will be placed here_
 
+### Bug fix
+
+- Fix `typing_extensions` issue by wrapping it in `TYPE_CHECKING`, continuation of #564, via #572.
+
 ### Development
 
 - Improved test organization and coverage in `test_common.py` (#570):

src/libtmux/pane.py

@@ -13,8 +13,6 @@
 import typing as t
 import warnings
 
-from typing_extensions import Self
-
 from libtmux.common import has_gte_version, has_lt_version, tmux_cmd
 from libtmux.constants import (
     PANE_DIRECTION_FLAG_MAP,
@@ -28,12 +26,17 @@
 from . import exc
 
 if t.TYPE_CHECKING:
+    import sys
     import types
 
     from .server import Server
     from .session import Session
     from .window import Window
 
+    if sys.version_info >= (3, 11):
+        from typing import Self
+    else:
+        from typing_extensions import Self
 
 logger = logging.getLogger(__name__)
 

src/libtmux/server.py

@@ -15,8 +15,6 @@
 import typing as t
 import warnings
 
-from typing_extensions import Self
-
 from libtmux._internal.query_list import QueryList
 from libtmux.common import tmux_cmd
 from libtmux.neo import fetch_objs
@@ -39,9 +37,9 @@
     import types
 
     if sys.version_info >= (3, 10):
-        from typing import TypeAlias
+        from typing import Self, TypeAlias
     else:
-        from typing_extensions import TypeAlias
+        from typing_extensions import Self, TypeAlias
 
     DashLiteral: TypeAlias = t.Literal["-"]
 

src/libtmux/session.py

@@ -13,8 +13,6 @@
 import typing as t
 import warnings
 
-from typing_extensions import Self
-
 from libtmux._internal.query_list import QueryList
 from libtmux.constants import WINDOW_DIRECTION_FLAG_MAP, WindowDirection
 from libtmux.formats import FORMAT_SEPARATOR
@@ -33,10 +31,16 @@
 )
 
 if t.TYPE_CHECKING:
+    import sys
     import types
 
     from libtmux.common import tmux_cmd
 
+    if sys.version_info >= (3, 11):
+        from typing import Self
+    else:
+        from typing_extensions import Self
+
     from .server import Server
 
 

src/libtmux/window.py

@@ -13,8 +13,6 @@
 import typing as t
 import warnings
 
-from typing_extensions import Self
-
 from libtmux._internal.query_list import QueryList
 from libtmux.common import has_gte_version, tmux_cmd
 from libtmux.constants import (
@@ -30,11 +28,18 @@
 from .common import PaneDict, WindowOptionDict, handle_option_error
 
 if t.TYPE_CHECKING:
+    import sys
     import types
 
     from .server import Server
     from .session import Session
 
+    if sys.version_info >= (3, 11):
+        from typing import Self
+    else:
+        from typing_extensions import Self
+
+
 logger = logging.getLogger(__name__)