Update create_output signature

src/prompt_toolkit/output/defaults.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import sys
-from typing import TextIO, cast
+from typing import TYPE_CHECKING, TextIO, cast
 
 from prompt_toolkit.utils import (
     get_bell_environment_variable,
@@ -13,13 +13,17 @@
 from .color_depth import ColorDepth
 from .plain_text import PlainTextOutput
 
+if TYPE_CHECKING:
+    from prompt_toolkit.patch_stdout import StdoutProxy
+
+
 __all__ = [
     "create_output",
 ]
 
 
 def create_output(
-    stdout: TextIO | None = None, always_prefer_tty: bool = False
+    stdout: TextIO | StdoutProxy | None = None, always_prefer_tty: bool = False
 ) -> Output:
     """
     Return an :class:`~prompt_toolkit.output.Output` instance for the command
@@ -45,7 +49,7 @@ def create_output(
     if stdout is None:
         # By default, render to stdout. If the output is piped somewhere else,
         # render to stderr.
-        stdout = sys.__stdout__
+        stdout = sys.stdout
 
         if always_prefer_tty:
             for io in [sys.stdout, sys.stderr]:
@@ -57,8 +61,6 @@ def create_output(
     # If the patch_stdout context manager has been used, then sys.stdout is
     # replaced by this proxy. For prompt_toolkit applications, we want to use
     # the real stdout.
-    from prompt_toolkit.patch_stdout import StdoutProxy
-
     while isinstance(stdout, StdoutProxy):
         stdout = stdout.original_stdout