Override pkg_resources.ZipProvider.loader type (#11514)

stubs/setuptools/@tests/stubtest_allowlist.txt

@@ -1,6 +1,7 @@
 # Is always set in __init__
 pkg_resources.PathMetadata.egg_info
 pkg_resources.EggMetadata.loader
+pkg_resources.ZipProvider.loader
 
 # 1 used for True as a default value
 setuptools._distutils.dist.Distribution.get_command_obj

stubs/setuptools/pkg_resources/__init__.pyi

@@ -6,8 +6,9 @@ from abc import ABCMeta
 from collections.abc import Callable, Generator, Iterable, Iterator, Sequence
 from io import BytesIO
 from re import Pattern
-from typing import IO, Any, ClassVar, Literal, Protocol, TypeVar, overload
+from typing import IO, Any, ClassVar, Literal, Protocol, TypeVar, overload, type_check_only
 from typing_extensions import Self, TypeAlias
+from zipfile import ZipInfo
 
 from ._vendored_packaging import requirements as packaging_requirements, version as packaging_version
 
@@ -21,6 +22,10 @@ _PkgReqType: TypeAlias = str | Requirement
 _DistFinderType: TypeAlias = Callable[[_Importer, str, bool], Generator[Distribution, None, None]]
 _NSHandlerType: TypeAlias = Callable[[_Importer, str, str, types.ModuleType], str]
 
+@type_check_only
+class _ZipLoaderModule(Protocol):
+    __loader__: zipimport.zipimporter
+
 def declare_namespace(packageName: str) -> None: ...
 def fixup_namespace_packages(path_item: str, parent=None) -> None: ...
 
@@ -321,8 +326,11 @@ class PathMetadata(DefaultProvider):
 class ZipProvider(EggProvider):
     eagers: list[str] | None
     zip_pre: str
+    # ZipProvider's loader should always be a zipimporter
+    loader: zipimport.zipimporter
+    def __init__(self, module: _ZipLoaderModule) -> None: ...
     @property
-    def zipinfo(self): ...
+    def zipinfo(self) -> dict[str, ZipInfo]: ...
 
 class EggMetadata(ZipProvider):
     loader: zipimport.zipimporter