Remove the need for typing-extensions

Author: dwoz

relenv/build/common.py

@@ -38,12 +38,7 @@
     cast,
 )
 
-try:
-    from typing import TYPE_CHECKING
-except ImportError:  # pragma: no cover
-    TYPE_CHECKING = False
-
-from typing_extensions import Protocol, TypedDict
+from typing import TYPE_CHECKING, Protocol, TypedDict
 
 if TYPE_CHECKING:
     from multiprocessing.synchronize import Event as SyncEvent

relenv/common.py

@@ -20,9 +20,7 @@
 import textwrap
 import threading
 import time
-from typing import IO, Any, BinaryIO, Iterable, Mapping, Optional, Union, cast
-
-from typing_extensions import Literal
+from typing import IO, Any, BinaryIO, Iterable, Literal, Mapping, Optional, Union, cast
 
 # Re-export frequently monkeypatched modules for type checking.
 os = _os

setup.cfg

@@ -17,8 +17,6 @@ packages = find:
 package_dir =
   relenv = relenv
 include_package_data = True
-install_requires =
-    typing-extensions
 
 [options.entry_points]
 console_scripts =
@@ -64,7 +62,9 @@ ignore =
   # F405 '*' may be undefined, or defined from star imports: *
   F405
   # line break before binary operator, black does this with pathlib.Path objects
-  W503
+  W503,
+  # TYP001 guard import by TYPE_CHECKING (not needed for py3.10+)
+  TYP001
 
 per-file-ignores =
   # F401 imported but unused

tests/test_common.py

@@ -11,11 +11,10 @@
 import sys
 import tarfile
 from types import ModuleType
-from typing import BinaryIO
+from typing import BinaryIO, Literal
 from unittest.mock import patch
 
 import pytest
-from typing_extensions import Literal
 
 import relenv.common
 from relenv.common import (

tests/test_module_imports.py

@@ -5,12 +5,7 @@
 
 import importlib
 import pathlib
-from typing import Any, Callable, List, Sequence, TypeVar, cast
-
-try:
-    from typing import TYPE_CHECKING
-except ImportError:  # pragma: no cover
-    TYPE_CHECKING = False
+from typing import TYPE_CHECKING, Any, Callable, List, Sequence, TypeVar, cast
 
 import pytest