feat: Support Python 3.8 thanks to typing-extensions

Author: pawamoy

pyproject.toml

@@ -28,7 +28,10 @@ classifiers = [
     "Topic :: Utilities",
     "Typing :: Typed",
 ]
-dependencies = []
+dependencies = [
+    # TODO: remove once support for Python 3.8 is dropped
+    "typing-extensions>=4.7; python_version < '3.9'",
+]
 
 [project.urls]
 Homepage = "https://pawamoy.github.io/griffe-typingdoc"

src/griffe_typingdoc/extension.py

@@ -3,15 +3,22 @@
 from __future__ import annotations
 
 import ast
+import sys
 from collections import defaultdict
-from typing import TYPE_CHECKING, Annotated, Any
+from typing import TYPE_CHECKING, Any
 
 from griffe.agents.extensions import VisitorExtension, When
 from griffe.agents.nodes import safe_get_annotation
 from griffe.docstrings.dataclasses import DocstringParameter, DocstringSectionParameters
 
 from griffe_typingdoc.typing_doc import __typing_doc__
 
+# TODO: remove once support for Python 3.8 is dropped
+if sys.version_info < (3, 9):
+    from typing_extensions import Annotated
+else:
+    from typing import Annotated
+
 if TYPE_CHECKING:
     from griffe.dataclasses import Function