move typing_extensions.py back into typing.py =\ (#28549)

lib/spack/external/py2/typing.py

@@ -1,4 +1,4 @@
-# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
@@ -80,3 +80,24 @@
 get_type_hints = None
 no_type_check = None
 no_type_check_decorator = None
+
+## typing_extensions
+# We get a ModuleNotFoundError when attempting to import anything from typing_extensions
+# if we separate this into a separate typing_extensions.py file for some reason.
+
+# (1) Unparameterized types.
+IntVar = object
+Literal = object
+NewType = object
+Text = object
+
+# (2) Parameterized types.
+Protocol = defaultdict(lambda: object)
+
+# (3) Macro for avoiding evaluation except during type checking.
+TYPE_CHECKING = False
+
+# (4) Decorators.
+final = lambda x: x
+overload = lambda x: x
+runtime_checkable = lambda x: x

lib/spack/external/py2/typing_extensions.py

@@ -1,26 +0,0 @@
-# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
-# Spack Project Developers. See the top-level COPYRIGHT file for details.
-#
-# SPDX-License-Identifier: (Apache-2.0 OR MIT)
-"""
-This is a fake set of symbols to allow spack to import typing in python
-versions where we do not support type checking (<3)
-"""
-from collections import defaultdict
-
-# (1) Unparameterized types.
-IntVar = object
-Literal = object
-NewType = object
-Text = object
-
-# (2) Parameterized types.
-Protocol = defaultdict(lambda: object)
-
-# (3) Macro for avoiding evaluation except during type checking.
-TYPE_CHECKING = False
-
-# (4) Decorators.
-final = lambda x: x
-overload = lambda x: x
-runtime_checkable = lambda x: x

lib/spack/spack/test/llnl/util/tty/log.py

@@ -11,8 +11,10 @@
 import signal
 import sys
 import time
-from types import ModuleType  # novm
-from typing import Optional  # novm
+from typing import TYPE_CHECKING, Optional  # novm
+
+if TYPE_CHECKING:
+    from types import ModuleType  # novm
 
 import pytest