hookspec: type annotate parent argument to pytest_collect_file

src/_pytest/doctest.py

@@ -32,6 +32,7 @@ from _pytest.compat import TYPE_CHECKING
 from _pytest.config import Config
 from _pytest.config.argparsing import Parser
 from _pytest.fixtures import FixtureRequest
+from _pytest.nodes import Collector
 from _pytest.outcomes import OutcomeException
 from _pytest.pathlib import import_path
 from _pytest.python_api import approx
@@ -118,7 +119,7 @@ def pytest_unconfigure() -> None:
 
 
 def pytest_collect_file(
-    path: py.path.local, parent
+    path: py.path.local, parent: Collector,
 ) -> Optional[Union["DoctestModule", "DoctestTextfile"]]:
     config = parent.config
     if path.ext == ".py":

src/_pytest/hookspec.py

@@ -274,10 +274,12 @@ def pytest_ignore_collect(path: py.path.local, config: "Config") -> Optional[boo
     """
 
 
-def pytest_collect_file(path: py.path.local, parent) -> "Optional[Collector]":
-    """Return collection Node or None for the given path.
+def pytest_collect_file(
+    path: py.path.local, parent: "Collector"
+) -> "Optional[Collector]":
+    """Create a Collector for the given path, or None if not relevant.
 
-    Any new node needs to have the specified ``parent`` as a parent.
+    The new node needs to have the specified ``parent`` as a parent.
 
     :param py.path.local path: The path to collect.
     """

src/_pytest/python.py

@@ -184,7 +184,9 @@ def pytest_pyfunc_call(pyfuncitem: "Function") -> Optional[object]:
     return True
 
 
-def pytest_collect_file(path: py.path.local, parent) -> Optional["Module"]:
+def pytest_collect_file(
+    path: py.path.local, parent: nodes.Collector
+) -> Optional["Module"]:
     ext = path.ext
     if ext == ".py":
         if not parent.session.isinitpath(path):