Use TYPE_CHECKING flag to avoid importing from typing_extensions …

…at run time (#877)

CHANGES/876.bugfix

@@ -0,0 +1 @@
+Use ``TYPE_CHECKING`` flag to avoid importing from ``typing_extensions`` at run time

CONTRIBUTORS.txt

@@ -7,6 +7,7 @@ Byeongjun Park
 Cecil Tonglet
 Christian Barra
 Danny Song
+Edgar Ramírez Mondragón
 eevelweezel
 Gaopeiliang
 Greg Guthe

aiodocker/types.py

@@ -1,6 +1,8 @@
 from __future__ import annotations
 
+import sys
 from typing import (
+    TYPE_CHECKING,
     Mapping,
     Protocol,
     Sequence,
@@ -9,7 +11,12 @@
     Union,
 )
 
-from typing_extensions import TypeAlias
+
+if TYPE_CHECKING:
+    if sys.version_info < (3, 10):
+        from typing_extensions import TypeAlias
+    else:
+        from typing import TypeAlias
 
 
 _T_co = TypeVar("_T_co", covariant=True)

pyproject.toml

@@ -35,6 +35,7 @@ ci = [
     "yarl==1.9.4",
 ]
 dev = [
+    "async-timeout==4.0.3",
     "codecov==2.1.13",
     "mypy==1.10.1",
     "packaging==24.1",

tests/conftest.py

@@ -6,6 +6,7 @@
 import traceback
 import uuid
 from typing import (
+    TYPE_CHECKING,
     Any,
     AsyncIterator,
     Awaitable,
@@ -15,13 +16,19 @@
 
 import pytest
 from packaging.version import parse as parse_version
-from typing_extensions import TypeAlias
 
 from aiodocker.containers import DockerContainer
 from aiodocker.docker import Docker
 from aiodocker.exceptions import DockerError
 
 
+if TYPE_CHECKING:
+    if sys.version_info < (3, 10):
+        from typing_extensions import TypeAlias
+    else:
+        from typing import TypeAlias
+
+
 API_VERSIONS = {
     "17.06": "v1.30",
     "17.09": "v1.32",