Put the TypeAlias import behind the TYPE_CHECKING gate

test/utils/result.py

@@ -6,12 +6,13 @@
 from collections.abc import Collection, Mapping
 from dataclasses import dataclass
 from functools import lru_cache
-from typing import Optional, Union
-
-from typing_extensions import TypeAlias
+from typing import TYPE_CHECKING, Optional, Union
 
 from rdflib.term import BNode, Identifier, Literal, Variable
 
+if TYPE_CHECKING:
+    from typing_extensions import TypeAlias
+
 builtin_set: TypeAlias = set
 
 logger = logging.getLogger(__name__)