[al clone] Expose FixtureFunctionDefinition as part of the public API

changelog/14853.feature.rst

@@ -0,0 +1 @@
+Exposed ``FixtureFunctionDefinition`` as ``pytest.FixtureFunctionDefinition``.

src/pytest/__init__.py

@@ -26,6 +26,7 @@
 from _pytest.doctest import DoctestItem
 from _pytest.fixtures import fixture
 from _pytest.fixtures import FixtureDef
+from _pytest.fixtures import FixtureFunctionDefinition
 from _pytest.fixtures import FixtureLookupError
 from _pytest.fixtures import FixtureRequest
 from _pytest.fixtures import register_fixture
@@ -115,6 +116,7 @@
     "ExitCode",
     "File",
     "FixtureDef",
+    "FixtureFunctionDefinition",
     "FixtureLookupError",
     "FixtureRequest",
     "Function",

testing/python/fixtures.py

@@ -1869,6 +1869,16 @@ def test_fixture_has_same_doc():
         result = pytester.runpytest()
         result.assert_outcomes(passed=1)
 
+    def test_fixture_function_definition_public_api(self) -> None:
+        """FixtureFunctionDefinition is accessible as pytest.FixtureFunctionDefinition."""
+        assert "FixtureFunctionDefinition" in pytest.__all__
+
+        @pytest.fixture
+        def fixture_func() -> None:
+            pass
+
+        assert isinstance(fixture_func, pytest.FixtureFunctionDefinition)
+
 
 class TestFixtureManagerParseFactories:
     @pytest.fixture