Add FixtureDefDict type alias

src/_pytest/fixtures.py

@@ -95,6 +95,9 @@
 # The parameters that a fixture function receives.
 FixtureParams = ParamSpec("FixtureParams")
 
+# A dict of fixture name -> its FixtureDef.
+FixtureDefDict: TypeAlias = dict[str, "FixtureDef[Any]"]
+
 # The type of fixture function (type alias generic in fixture params and value).
 _FixtureFunc: TypeAlias = Union[
     Callable[FixtureParams, FixtureValue],
@@ -370,7 +373,7 @@ def __init__(
         pyfuncitem: Function,
         fixturename: str | None,
         arg2fixturedefs: dict[str, Sequence[FixtureDef[Any]]],
-        fixture_defs: dict[str, FixtureDef[Any]],
+        fixture_defs: FixtureDefDict,
         *,
         _ispytest: bool = False,
     ) -> None:

src/_pytest/python.py

@@ -51,6 +51,7 @@
 from _pytest.config.argparsing import Parser
 from _pytest.deprecated import check_ispytest
 from _pytest.fixtures import FixtureDef
+from _pytest.fixtures import FixtureDefDict
 from _pytest.fixtures import FixtureRequest
 from _pytest.fixtures import FuncFixtureInfo
 from _pytest.fixtures import get_scope_node
@@ -1085,7 +1086,7 @@ def get_direct_param_fixture_func(request: FixtureRequest) -> Any:
 
 
 # Used for storing pseudo fixturedefs for direct parametrization.
-name2pseudofixturedef_key = StashKey[dict[str, FixtureDef[Any]]]()
+name2pseudofixturedef_key = StashKey[FixtureDefDict]()
 
 
 @final
@@ -1271,7 +1272,7 @@ def parametrize(
         if node is None:
             name2pseudofixturedef = None
         else:
-            default: dict[str, FixtureDef[Any]] = {}
+            default: FixtureDefDict = {}
             name2pseudofixturedef = node.stash.setdefault(
                 name2pseudofixturedef_key, default
             )