Undeclared typing-extensions dependency in 6.5.0

[pstjohn]

This import from typing_extensions is causing a ModuleNotFound error for me. I think you'll need to add typing-extensions as a dependency in pyproject.toml

importlib_resources/importlib_resources/abc.py

Line 20 in 10d87bf

from typing_extensions import Literal

[mhogan-nwra]

I am also encountering this error. This is my stack

env_TEST_3.9/lib/python3.9/site-packages/matplotlib/pyplot.py:58: in <module> 
 from matplotlib import ( # noqa: F401 Re-exported for typing.
env_TEST_3.9/lib/python3.9/site-packages/matplotlib/style/__init__.py:1: in <module>
 from .core import available, context, library, reload_library, use
env_TEST_3.9/lib/python3.9/site-packages/matplotlib/style/core.py:26: in <module>
 import importlib_resources
env_TEST_3.9/lib/python3.9/site-packages/importlib_resources/__init__.py:10: in <module>
 from ._common import (
env_TEST_3.9/lib/python3.9/site-packages/importlib_resources/_common.py:13: in <module>
 from .abc import ResourceReader, Traversable
env_TEST_3.9/lib/python3.9/site-packages/importlib_resources/abc.py:20: in <module>
 from typing_extensions import Literal
E ModuleNotFoundError: No module named 'typing_extensions'

EDIT: I experience this issue in a 3.9 virtualenv in my CI pipeline, but I do not encounter this problem with CI virtualenv's with 3.10+.

[jaraco]

Well, shoot. This dependency also will cause problems when porting the change to CPython, as CPython cannot have dependencies. I wonder what the pure-python equivalent would be.

[jaraco]

6.5.2 being released now.