diff --git a/stdlib/distutils/cmd.pyi b/stdlib/distutils/cmd.pyi
index 843be7a5133b..ca4fb3265324 100644
--- a/stdlib/distutils/cmd.pyi
+++ b/stdlib/distutils/cmd.pyi
@@ -3,9 +3,10 @@ from abc import abstractmethod
 from collections.abc import Callable, Iterable
 from distutils.dist import Distribution
 from distutils.file_util import _BytesPathT, _StrPathT
-from typing import Any, ClassVar, Literal, overload
+from typing import Any, ClassVar, Literal, TypeVar, overload
 from typing_extensions import TypeVarTuple, Unpack
 
+_CommandT = TypeVar("_CommandT", bound=Command)
 _Ts = TypeVarTuple("_Ts")
 
 class Command:
@@ -22,13 +23,16 @@ class Command:
     def announce(self, msg: str, level: int = 1) -> None: ...
     def debug_print(self, msg: str) -> None: ...
     def ensure_string(self, option: str, default: str | None = None) -> None: ...
-    def ensure_string_list(self, option: str | list[str]) -> None: ...
+    def ensure_string_list(self, option: str) -> None: ...
     def ensure_filename(self, option: str) -> None: ...
     def ensure_dirname(self, option: str) -> None: ...
     def get_command_name(self) -> str: ...
     def set_undefined_options(self, src_cmd: str, *option_pairs: tuple[str, str]) -> None: ...
     def get_finalized_command(self, command: str, create: bool | Literal[0, 1] = 1) -> Command: ...
-    def reinitialize_command(self, command: Command | str, reinit_subcommands: bool | Literal[0, 1] = 0) -> Command: ...
+    @overload
+    def reinitialize_command(self, command: str, reinit_subcommands: bool | Literal[0, 1] = 0) -> Command: ...
+    @overload
+    def reinitialize_command(self, command: _CommandT, reinit_subcommands: bool | Literal[0, 1] = 0) -> _CommandT: ...
     def run_command(self, command: str) -> None: ...
     def get_sub_commands(self) -> list[str]: ...
     def warn(self, msg: str) -> None: ...
diff --git a/stubs/setuptools/setuptools/__init__.pyi b/stubs/setuptools/setuptools/__init__.pyi
index c3a88c8776fb..a044e09d3726 100644
--- a/stubs/setuptools/setuptools/__init__.pyi
+++ b/stubs/setuptools/setuptools/__init__.pyi
@@ -1,7 +1,7 @@
 from _typeshed import Incomplete, StrPath
 from abc import abstractmethod
 from collections.abc import Iterable, Mapping, Sequence
-from typing import Any
+from typing import Any, TypeVar, overload
 
 from ._distutils.cmd import Command as _Command
 from .depends import Require as Require
@@ -9,6 +9,8 @@ from .dist import Distribution as Distribution
 from .extension import Extension as Extension
 from .warnings import SetuptoolsDeprecationWarning as SetuptoolsDeprecationWarning
 
+_CommandT = TypeVar("_CommandT", bound=_Command)
+
 __all__ = [
     "setup",
     "Distribution",
@@ -76,8 +78,11 @@ class Command(_Command):
     distribution: Distribution
     # Any: Dynamic command subclass attributes
     def __init__(self, dist: Distribution, **kw: Any) -> None: ...
-    def ensure_string_list(self, option: str | list[str]) -> None: ...
-    def reinitialize_command(self, command: _Command | str, reinit_subcommands: bool = False, **kw: Any) -> _Command: ...  # type: ignore[override]
+    def ensure_string_list(self, option: str) -> None: ...
+    @overload  # type: ignore[override] # Extra **kw param
+    def reinitialize_command(self, command: str, reinit_subcommands: bool = False, **kw) -> _Command: ...
+    @overload
+    def reinitialize_command(self, command: _CommandT, reinit_subcommands: bool = False, **kw) -> _CommandT: ...
     @abstractmethod
     def initialize_options(self) -> None: ...
     @abstractmethod
diff --git a/stubs/setuptools/setuptools/_distutils/cmd.pyi b/stubs/setuptools/setuptools/_distutils/cmd.pyi
index 950a5c5a7373..42310b8cfb08 100644
--- a/stubs/setuptools/setuptools/_distutils/cmd.pyi
+++ b/stubs/setuptools/setuptools/_distutils/cmd.pyi
@@ -8,6 +8,7 @@ from .dist import Distribution
 
 _StrPathT = TypeVar("_StrPathT", bound=StrPath)
 _BytesPathT = TypeVar("_BytesPathT", bound=BytesPath)
+_CommandT = TypeVar("_CommandT", bound=Command)
 _Ts = TypeVarTuple("_Ts")
 
 class Command:
@@ -25,13 +26,16 @@ class Command:
     def announce(self, msg: str, level: int = ...) -> None: ...
     def debug_print(self, msg: str) -> None: ...
     def ensure_string(self, option: str, default: str | None = ...) -> None: ...
-    def ensure_string_list(self, option: str | list[str]) -> None: ...
+    def ensure_string_list(self, option: str) -> None: ...
     def ensure_filename(self, option: str) -> None: ...
     def ensure_dirname(self, option: str) -> None: ...
     def get_command_name(self) -> str: ...
     def set_undefined_options(self, src_cmd: str, *option_pairs: tuple[str, str]) -> None: ...
     def get_finalized_command(self, command: str, create: bool = True) -> Command: ...
-    def reinitialize_command(self, command: Command | str, reinit_subcommands: bool = False) -> Command: ...
+    @overload
+    def reinitialize_command(self, command: str, reinit_subcommands: bool = False) -> Command: ...
+    @overload
+    def reinitialize_command(self, command: _CommandT, reinit_subcommands: bool = False) -> _CommandT: ...
     def run_command(self, command: str) -> None: ...
     def get_sub_commands(self) -> list[str]: ...
     def warn(self, msg: str) -> None: ...
diff --git a/stubs/setuptools/setuptools/_distutils/command/bdist.pyi b/stubs/setuptools/setuptools/_distutils/command/bdist.pyi
index edeb0e6a5284..0d699298314b 100644
--- a/stubs/setuptools/setuptools/_distutils/command/bdist.pyi
+++ b/stubs/setuptools/setuptools/_distutils/command/bdist.pyi
@@ -13,7 +13,7 @@ class ListCompat(dict[str, tuple[str, str]]):
 
 class bdist(Command):
     description: ClassVar[str]
-    user_options: ClassVar[list[tuple[str | None, str | None, str | None]]]
+    user_options: ClassVar[list[tuple[str, str | None, str | None]]]
     boolean_options: ClassVar[list[str]]
     help_options: ClassVar[list[tuple[str, str | None, str, Callable[[], Unused]]]]
     no_format_option: ClassVar[tuple[str, ...]]
diff --git a/stubs/setuptools/setuptools/build_meta.pyi b/stubs/setuptools/setuptools/build_meta.pyi
index 4f3ae04151f9..758a2bdb9b6a 100644
--- a/stubs/setuptools/setuptools/build_meta.pyi
+++ b/stubs/setuptools/setuptools/build_meta.pyi
@@ -30,22 +30,18 @@ class Distribution(dist.Distribution):
 
 class _BuildMetaBackend:
     def run_setup(self, setup_script: str = "setup.py") -> None: ...
-    def get_requires_for_build_wheel(self, config_settings: _ConfigSettings | None = None) -> list[str]: ...
-    def get_requires_for_build_sdist(self, config_settings: _ConfigSettings | None = None) -> list[str]: ...
-    def prepare_metadata_for_build_wheel(
-        self, metadata_directory: str, config_settings: _ConfigSettings | None = None
-    ) -> str: ...
+    def get_requires_for_build_wheel(self, config_settings: _ConfigSettings = None) -> list[str]: ...
+    def get_requires_for_build_sdist(self, config_settings: _ConfigSettings = None) -> list[str]: ...
+    def prepare_metadata_for_build_wheel(self, metadata_directory: str, config_settings: _ConfigSettings = None) -> str: ...
     def build_wheel(
-        self, wheel_directory: StrPath, config_settings: _ConfigSettings | None = None, metadata_directory: StrPath | None = None
+        self, wheel_directory: StrPath, config_settings: _ConfigSettings = None, metadata_directory: StrPath | None = None
     ) -> str: ...
-    def build_sdist(self, sdist_directory: StrPath, config_settings: _ConfigSettings | None = None) -> str: ...
+    def build_sdist(self, sdist_directory: StrPath, config_settings: _ConfigSettings = None) -> str: ...
     def build_editable(
-        self, wheel_directory: StrPath, config_settings: _ConfigSettings | None = None, metadata_directory: str | None = None
-    ) -> str: ...
-    def get_requires_for_build_editable(self, config_settings: _ConfigSettings | None = None) -> list[str]: ...
-    def prepare_metadata_for_build_editable(
-        self, metadata_directory: str, config_settings: _ConfigSettings | None = None
+        self, wheel_directory: StrPath, config_settings: _ConfigSettings = None, metadata_directory: StrPath | None = None
     ) -> str: ...
+    def get_requires_for_build_editable(self, config_settings: _ConfigSettings = None) -> list[str]: ...
+    def prepare_metadata_for_build_editable(self, metadata_directory: str, config_settings: _ConfigSettings = None) -> str: ...
 
 class _BuildMetaLegacyBackend(_BuildMetaBackend):
     def run_setup(self, setup_script: str = "setup.py") -> None: ...
diff --git a/stubs/setuptools/setuptools/command/build_py.pyi b/stubs/setuptools/setuptools/command/build_py.pyi
index fe71ff6c0a9e..cefb13f55ca0 100644
--- a/stubs/setuptools/setuptools/command/build_py.pyi
+++ b/stubs/setuptools/setuptools/command/build_py.pyi
@@ -11,14 +11,14 @@ class build_py(orig.build_py):
     package_data: dict[str, list[str]]
     exclude_package_data: dict[Incomplete, Incomplete]
     def finalize_options(self) -> None: ...
-    def copy_file(  # type: ignore[override]
+    def copy_file(  # type: ignore[override] # No overload, str support only
         self,
         infile: StrPath,
         outfile: _StrPathT,
         preserve_mode: bool = True,
         preserve_times: bool = True,
         link: str | None = None,
-        level=1,
+        level: int = 1,
     ) -> tuple[_StrPathT | str, bool]: ...
     def run(self) -> None: ...
     data_files: list[tuple[Incomplete, Incomplete, Incomplete, list[Incomplete]]]
@@ -26,7 +26,7 @@ class build_py(orig.build_py):
     def build_module(self, module, module_file, package): ...
     def get_data_files_without_manifest(self) -> list[tuple[Incomplete, Incomplete, Incomplete, list[Incomplete]]]: ...
     def find_data_files(self, package, src_dir): ...
-    def get_outputs(self, include_bytecode: bool = True) -> list[str]: ...  # type: ignore[override]
+    def get_outputs(self, include_bytecode: bool = True) -> list[str]: ...  # type: ignore[override] # Using a real boolean instead of 0|1
     def build_package_data(self) -> None: ...
     manifest_files: dict[Incomplete, Incomplete]
     def get_output_mapping(self) -> dict[str, str]: ...
diff --git a/stubs/setuptools/setuptools/command/easy_install.pyi b/stubs/setuptools/setuptools/command/easy_install.pyi
index 73b296a24f4e..6db9d45d6848 100644
--- a/stubs/setuptools/setuptools/command/easy_install.pyi
+++ b/stubs/setuptools/setuptools/command/easy_install.pyi
@@ -1,9 +1,10 @@
 from _typeshed import Incomplete
 from collections.abc import Iterable, Iterator
-from typing import ClassVar, TypedDict
+from typing import Any, ClassVar, Literal, TypedDict, type_check_only
 from typing_extensions import Self
 
 from pkg_resources import Environment
+from setuptools.package_index import PackageIndex
 
 from .. import Command, SetuptoolsDeprecationWarning
 
@@ -15,7 +16,7 @@ class easy_install(Command):
     user_options: ClassVar[list[tuple[str, str | None, str]]]
     boolean_options: ClassVar[list[str]]
     negative_opt: ClassVar[dict[str, str]]
-    create_index: Incomplete
+    create_index: ClassVar[type[PackageIndex]]
     user: bool
     zip_ok: Incomplete
     install_dir: Incomplete
@@ -36,22 +37,22 @@ class easy_install(Command):
     install_data: Incomplete
     install_base: Incomplete
     install_platbase: Incomplete
-    install_userbase: Incomplete
-    install_usersite: Incomplete
+    install_userbase: str | None
+    install_usersite: str | None
     no_find_links: Incomplete
     package_index: Incomplete
     pth_file: Incomplete
     site_dirs: Incomplete
     installed_projects: Incomplete
-    verbose: Incomplete
+    verbose: bool | Literal[0, 1]
     def initialize_options(self) -> None: ...
     def delete_blockers(self, blockers) -> None: ...
-    config_vars: Incomplete
+    config_vars: dict[str, Any]
     script_dir: Incomplete
-    all_site_dirs: Incomplete
-    shadow_path: Incomplete
-    local_index: Incomplete
-    outputs: Incomplete
+    all_site_dirs: list[str]
+    shadow_path: list[str]
+    local_index: Environment
+    outputs: list[Incomplete]
     def finalize_options(self) -> None: ...
     def expand_basedirs(self) -> None: ...
     def expand_dirs(self) -> None: ...
@@ -98,7 +99,7 @@ def get_exe_prefixes(exe_filename): ...
 class PthDistributions(Environment):
     dirty: bool
     filename: Incomplete
-    sitedirs: Incomplete
+    sitedirs: list[str]
     basedir: Incomplete
     paths: list[str]
     def __init__(self, filename, sitedirs=()) -> None: ...
@@ -108,9 +109,10 @@ class PthDistributions(Environment):
     def make_relative(self, path): ...
 
 class RewritePthDistributions(PthDistributions):
-    prelude: Incomplete
-    postlude: Incomplete
+    prelude: str
+    postlude: str
 
+@type_check_only
 class _SplitArgs(TypedDict, total=False):
     comments: bool
     posix: bool
diff --git a/stubs/setuptools/setuptools/command/editable_wheel.pyi b/stubs/setuptools/setuptools/command/editable_wheel.pyi
index 97a4573a6783..3d8f73bcc0b6 100644
--- a/stubs/setuptools/setuptools/command/editable_wheel.pyi
+++ b/stubs/setuptools/setuptools/command/editable_wheel.pyi
@@ -1,5 +1,5 @@
 from _typeshed import Incomplete, StrPath
-from collections.abc import Iterator
+from collections.abc import Iterator, Mapping
 from enum import Enum
 from pathlib import Path
 from types import TracebackType
@@ -28,45 +28,45 @@ class editable_wheel(Command):
     project_dir: Incomplete
     mode: Incomplete
     def initialize_options(self) -> None: ...
-    package_dir: Incomplete
+    package_dir: dict[Incomplete, Incomplete]
     def finalize_options(self) -> None: ...
     def run(self) -> None: ...
 
 class EditableStrategy(Protocol):
-    def __call__(self, wheel: _WheelFile, files: list[str], mapping: dict[str, str]) -> None: ...
+    def __call__(self, wheel: _WheelFile, files: list[str], mapping: Mapping[str, str]) -> None: ...
     def __enter__(self): ...
     def __exit__(
         self, _exc_type: type[BaseException] | None, _exc_value: BaseException | None, _traceback: TracebackType | None
     ) -> None: ...
 
 class _StaticPth:
-    dist: Incomplete
-    name: Incomplete
-    path_entries: Incomplete
+    dist: Distribution
+    name: str
+    path_entries: list[Path]
     def __init__(self, dist: Distribution, name: str, path_entries: list[Path]) -> None: ...
-    def __call__(self, wheel: _WheelFile, files: list[str], mapping: dict[str, str]): ...
+    def __call__(self, wheel: _WheelFile, files: list[str], mapping: Mapping[str, str]): ...
     def __enter__(self) -> Self: ...
     def __exit__(
         self, _exc_type: type[BaseException] | None, _exc_value: BaseException | None, _traceback: TracebackType | None
     ) -> None: ...
 
 class _LinkTree(_StaticPth):
-    auxiliary_dir: Incomplete
-    build_lib: Incomplete
+    auxiliary_dir: Path
+    build_lib: Path
     def __init__(self, dist: Distribution, name: str, auxiliary_dir: StrPath, build_lib: StrPath) -> None: ...
-    def __call__(self, wheel: _WheelFile, files: list[str], mapping: dict[str, str]): ...
+    def __call__(self, wheel: _WheelFile, files: list[str], mapping: Mapping[str, str]): ...
     def __enter__(self) -> Self: ...
     def __exit__(
         self, _exc_type: type[BaseException] | None, _exc_value: BaseException | None, _traceback: TracebackType | None
     ) -> None: ...
 
 class _TopLevelFinder:
-    dist: Incomplete
-    name: Incomplete
+    dist: Distribution
+    name: str
     def __init__(self, dist: Distribution, name: str) -> None: ...
     def template_vars(self) -> tuple[str, str, dict[str, str], dict[str, list[str]]]: ...
     def get_implementation(self) -> Iterator[tuple[str, bytes]]: ...
-    def __call__(self, wheel: _WheelFile, files: list[str], mapping: dict[str, str]): ...
+    def __call__(self, wheel: _WheelFile, files: list[str], mapping: Mapping[str, str]): ...
     def __enter__(self) -> Self: ...
     def __exit__(
         self, _exc_type: type[BaseException] | None, _exc_value: BaseException | None, _traceback: TracebackType | None
@@ -77,7 +77,7 @@ class _NamespaceInstaller(namespaces.Installer):
     src_root: Incomplete
     installation_dir: Incomplete
     editable_name: Incomplete
-    outputs: Incomplete
+    outputs: list[Incomplete]
     dry_run: bool
     def __init__(self, distribution, installation_dir, editable_name, src_root) -> None: ...
 
diff --git a/stubs/setuptools/setuptools/command/egg_info.pyi b/stubs/setuptools/setuptools/command/egg_info.pyi
index fe931303f734..c318c8134638 100644
--- a/stubs/setuptools/setuptools/command/egg_info.pyi
+++ b/stubs/setuptools/setuptools/command/egg_info.pyi
@@ -28,7 +28,6 @@ class egg_info(InfoCommon, Command):
     egg_name: Incomplete
     egg_info: Incomplete
     egg_version: Incomplete
-    broken_egg_info: bool
     def initialize_options(self) -> None: ...
     @property
     def tag_svn_revision(self) -> None: ...
@@ -65,7 +64,7 @@ class manifest_maker(sdist):
     force_manifest: bool
     def initialize_options(self) -> None: ...
     def finalize_options(self) -> None: ...
-    filelist: Incomplete
+    filelist: FileList
     def run(self) -> None: ...
     def write_manifest(self) -> None: ...
     def warn(self, msg) -> None: ...
diff --git a/stubs/setuptools/setuptools/command/install.pyi b/stubs/setuptools/setuptools/command/install.pyi
index 8e93bd2b9bd1..d5f499e7403d 100644
--- a/stubs/setuptools/setuptools/command/install.pyi
+++ b/stubs/setuptools/setuptools/command/install.pyi
@@ -10,7 +10,7 @@ class install(orig.install):
     # Any to work around variance issues
     new_commands: list[tuple[str, Callable[[Any], bool]] | None]
     old_and_unmanageable: Incomplete
-    single_version_externally_managed: Incomplete
+    single_version_externally_managed: bool | None
     def initialize_options(self) -> None: ...
     def finalize_options(self) -> None: ...
     path_file: Incomplete
diff --git a/stubs/setuptools/setuptools/command/install_lib.pyi b/stubs/setuptools/setuptools/command/install_lib.pyi
index 79e3e59e0405..2da4a2e50bc8 100644
--- a/stubs/setuptools/setuptools/command/install_lib.pyi
+++ b/stubs/setuptools/setuptools/command/install_lib.pyi
@@ -9,9 +9,9 @@ class install_lib(orig.install_lib):
         self,
         infile: StrPath,
         outfile: str,
-        preserve_mode: bool = True,  # type: ignore[override]
-        preserve_times: bool = True,  # type: ignore[override]
-        preserve_symlinks: bool = False,  # type: ignore[override]
+        preserve_mode: bool = True,
+        preserve_times: bool = True,
+        preserve_symlinks: bool = False,
         level: Unused = 1,
     ): ...
     def get_outputs(self): ...
diff --git a/stubs/setuptools/setuptools/command/upload_docs.pyi b/stubs/setuptools/setuptools/command/upload_docs.pyi
index f8ed816acc95..3e75d483e019 100644
--- a/stubs/setuptools/setuptools/command/upload_docs.pyi
+++ b/stubs/setuptools/setuptools/command/upload_docs.pyi
@@ -8,7 +8,7 @@ class upload_docs(upload):
     DEFAULT_REPOSITORY: ClassVar[str]
     description: ClassVar[str]
     user_options: ClassVar[list[tuple[str, str | None, str]]]
-    boolean_options: ClassVar[list[str]]
+    boolean_options = upload.boolean_options
     def has_sphinx(self): ...
     # Any to work around variance issues
     sub_commands: ClassVar[list[tuple[str, Callable[[Any], bool] | None]]]
diff --git a/stubs/setuptools/setuptools/config/__init__.pyi b/stubs/setuptools/setuptools/config/__init__.pyi
index ca745c9194b9..dbb468cd5d8c 100644
--- a/stubs/setuptools/setuptools/config/__init__.pyi
+++ b/stubs/setuptools/setuptools/config/__init__.pyi
@@ -1,9 +1,16 @@
-from _typeshed import Incomplete
+from _typeshed import Incomplete, StrPath
 from collections.abc import Callable
 from typing import TypeVar
 
+from setuptools.config.setupcfg import AllCommandOptions, ConfigMetadataHandler, ConfigOptionsHandler
+from setuptools.dist import Distribution
+
 Fn = TypeVar("Fn", bound=Callable[..., Incomplete])  # noqa: Y001 # Exists at runtime
 __all__ = ("parse_configuration", "read_configuration")
 
-def read_configuration(filepath, find_others: bool = False, ignore_option_errors: bool = False): ...
-def parse_configuration(distribution, command_options, ignore_option_errors: bool = False): ...
+def read_configuration(
+    filepath: StrPath, find_others: bool = False, ignore_option_errors: bool = False
+) -> dict[Incomplete, Incomplete]: ...
+def parse_configuration(
+    distribution: Distribution, command_options: AllCommandOptions, ignore_option_errors: bool = False
+) -> tuple[ConfigMetadataHandler, ConfigOptionsHandler]: ...
diff --git a/stubs/setuptools/setuptools/config/expand.pyi b/stubs/setuptools/setuptools/config/expand.pyi
index 0bc46382ef7a..cdd99861e836 100644
--- a/stubs/setuptools/setuptools/config/expand.pyi
+++ b/stubs/setuptools/setuptools/config/expand.pyi
@@ -12,7 +12,7 @@ _VCo = TypeVar("_VCo", covariant=True)
 
 class StaticModule:
     def __init__(self, name: str, spec: ModuleSpec) -> None: ...
-    def __getattr__(self, attr): ...
+    def __getattr__(self, attr: str): ...
 
 def glob_relative(patterns: Iterable[str], root_dir: StrPath | None = None) -> list[str]: ...
 def read_files(filepaths: StrPath | Iterable[StrPath], root_dir: StrPath | None = None) -> str: ...
diff --git a/stubs/setuptools/setuptools/config/pyprojecttoml.pyi b/stubs/setuptools/setuptools/config/pyprojecttoml.pyi
index 69f75652fae3..e61686654dfe 100644
--- a/stubs/setuptools/setuptools/config/pyprojecttoml.pyi
+++ b/stubs/setuptools/setuptools/config/pyprojecttoml.pyi
@@ -1,5 +1,6 @@
 from _typeshed import Incomplete, StrPath
 from types import TracebackType
+from typing import Any
 from typing_extensions import Self
 
 from ..dist import Distribution
@@ -11,7 +12,7 @@ def validate(config: dict[Incomplete, Incomplete], filepath: StrPath) -> bool: .
 def apply_configuration(dist: Distribution, filepath: StrPath, ignore_option_errors: bool = False) -> Distribution: ...
 def read_configuration(
     filepath: StrPath, expand: bool = True, ignore_option_errors: bool = False, dist: Distribution | None = None
-): ...
+) -> dict[str, Any]: ...
 def expand_configuration(
     config: dict[Incomplete, Incomplete],
     root_dir: StrPath | None = None,
@@ -20,13 +21,13 @@ def expand_configuration(
 ) -> dict[Incomplete, Incomplete]: ...
 
 class _ConfigExpander:
-    config: Incomplete
-    root_dir: Incomplete
+    config: dict[Incomplete, Incomplete]
+    root_dir: StrPath
     project_cfg: Incomplete
     dynamic: Incomplete
     setuptools_cfg: Incomplete
     dynamic_cfg: Incomplete
-    ignore_option_errors: Incomplete
+    ignore_option_errors: bool
     def __init__(
         self,
         config: dict[Incomplete, Incomplete],
diff --git a/stubs/setuptools/setuptools/config/setupcfg.pyi b/stubs/setuptools/setuptools/config/setupcfg.pyi
index e3b88b4b3386..d54e32d5de05 100644
--- a/stubs/setuptools/setuptools/config/setupcfg.pyi
+++ b/stubs/setuptools/setuptools/config/setupcfg.pyi
@@ -1,12 +1,13 @@
 from _typeshed import Incomplete, StrPath
-from typing import ClassVar, Generic, TypeVar
+from typing import Any, ClassVar, Generic, TypeVar
+from typing_extensions import TypeAlias
 
 from .._distutils.dist import DistributionMetadata
 from ..dist import Distribution
 from . import expand
 
-SingleCommandOptions: Incomplete
-AllCommandOptions: Incomplete
+SingleCommandOptions: TypeAlias = dict[str, tuple[str, Any]]
+AllCommandOptions: TypeAlias = dict[str, SingleCommandOptions]
 Target = TypeVar("Target", bound=Distribution | DistributionMetadata)  # noqa: Y001 # Exists at runtime
 
 def read_configuration(
@@ -24,10 +25,10 @@ class ConfigHandler(Generic[Target]):
     section_prefix: str
     aliases: ClassVar[dict[str, str]]
     ignore_option_errors: Incomplete
-    target_obj: Incomplete
-    sections: Incomplete
-    set_options: Incomplete
-    ensure_discovered: Incomplete
+    target_obj: Target
+    sections: dict[str, SingleCommandOptions]
+    set_options: list[str]
+    ensure_discovered: expand.EnsurePackagesDiscovered
     def __init__(
         self,
         target_obj: Target,
@@ -45,8 +46,8 @@ class ConfigMetadataHandler(ConfigHandler[DistributionMetadata]):
     section_prefix: str
     aliases: ClassVar[dict[str, str]]
     strict_mode: bool
-    package_dir: Incomplete
-    root_dir: Incomplete
+    package_dir: dict[Incomplete, Incomplete] | None
+    root_dir: StrPath
     def __init__(
         self,
         target_obj: DistributionMetadata,
@@ -61,8 +62,8 @@ class ConfigMetadataHandler(ConfigHandler[DistributionMetadata]):
 
 class ConfigOptionsHandler(ConfigHandler[Distribution]):
     section_prefix: str
-    root_dir: Incomplete
-    package_dir: Incomplete
+    root_dir: str | None
+    package_dir: dict[str, str]
     def __init__(
         self,
         target_obj: Distribution,
diff --git a/stubs/setuptools/setuptools/depends.pyi b/stubs/setuptools/setuptools/depends.pyi
index c6376a641247..d47ac2d77af5 100644
--- a/stubs/setuptools/setuptools/depends.pyi
+++ b/stubs/setuptools/setuptools/depends.pyi
@@ -23,5 +23,5 @@ class Require:
     def is_present(self, paths: Incomplete | None = None): ...
     def is_current(self, paths: Incomplete | None = None): ...
 
-def get_module_constant(module, symbol, default: int = -1, paths: Incomplete | None = None): ...
-def extract_constant(code, symbol, default: int = -1): ...
+def get_module_constant(module, symbol, default: str | int = -1, paths: Incomplete | None = None) -> Any: ...
+def extract_constant(code, symbol, default: str | int = -1) -> Any: ...
diff --git a/stubs/setuptools/setuptools/discovery.pyi b/stubs/setuptools/setuptools/discovery.pyi
index d6cb61e70fc2..90f87b8491a3 100644
--- a/stubs/setuptools/setuptools/discovery.pyi
+++ b/stubs/setuptools/setuptools/discovery.pyi
@@ -1,3 +1,4 @@
+import itertools
 from _typeshed import Incomplete, StrPath
 from collections.abc import Iterable, Iterator, Mapping
 from typing import ClassVar
@@ -6,7 +7,7 @@ from typing_extensions import TypeAlias
 from . import Distribution
 
 StrIter: TypeAlias = Iterator[str]
-chain_iter: Incomplete
+chain_iter = itertools.chain.from_iterable
 
 class _Filter:
     def __init__(self, *patterns: str) -> None: ...
diff --git a/stubs/setuptools/setuptools/dist.pyi b/stubs/setuptools/setuptools/dist.pyi
index f151b388fa0d..51d4d0e89339 100644
--- a/stubs/setuptools/setuptools/dist.pyi
+++ b/stubs/setuptools/setuptools/dist.pyi
@@ -1,4 +1,4 @@
-from _typeshed import Incomplete
+from _typeshed import Incomplete, StrPath
 from collections.abc import Iterable, Iterator, MutableMapping
 
 from . import Command, SetuptoolsDeprecationWarning
@@ -13,7 +13,7 @@ class Distribution(_Distribution):
     def __init__(self, attrs: MutableMapping[str, Incomplete] | None = None) -> None: ...
     def warn_dash_deprecation(self, opt: str, section: str) -> str: ...
     def make_option_lowercase(self, opt: str, section: str) -> str: ...
-    def parse_config_files(self, filenames: Iterable[str] | None = None, ignore_option_errors: bool = False) -> None: ...
+    def parse_config_files(self, filenames: Iterable[StrPath] | None = None, ignore_option_errors: bool = False) -> None: ...
     def fetch_build_eggs(self, requires: str | Iterable[str]): ...
     def get_egg_cache_dir(self) -> str: ...
     def fetch_build_egg(self, req): ...
diff --git a/stubs/setuptools/setuptools/modified.pyi b/stubs/setuptools/setuptools/modified.pyi
index 3148cc626dc6..0437d4efc3ed 100644
--- a/stubs/setuptools/setuptools/modified.pyi
+++ b/stubs/setuptools/setuptools/modified.pyi
@@ -1,8 +1,3 @@
-from ._distutils._modified import (
-    newer as newer,
-    newer_group as newer_group,
-    newer_pairwise as newer_pairwise,
-    newer_pairwise_group as newer_pairwise_group,
-)
+from ._distutils._modified import newer, newer_group, newer_pairwise, newer_pairwise_group
 
 __all__ = ["newer", "newer_pairwise", "newer_group", "newer_pairwise_group"]
diff --git a/stubs/setuptools/setuptools/msvc.pyi b/stubs/setuptools/setuptools/msvc.pyi
index daac625fab3b..6376fa5d36f0 100644
--- a/stubs/setuptools/setuptools/msvc.pyi
+++ b/stubs/setuptools/setuptools/msvc.pyi
@@ -93,7 +93,7 @@ class EnvironmentInfo:
     pi: Incomplete
     ri: Incomplete
     si: Incomplete
-    def __init__(self, arch, vc_ver: Incomplete | None = None, vc_min_ver: int = 0) -> None: ...
+    def __init__(self, arch, vc_ver: Incomplete | None = None, vc_min_ver: float = 0) -> None: ...
     @property
     def vs_ver(self): ...
     @property
diff --git a/stubs/setuptools/setuptools/warnings.pyi b/stubs/setuptools/setuptools/warnings.pyi
index b75a929b68db..6bb52b66dc9c 100644
--- a/stubs/setuptools/setuptools/warnings.pyi
+++ b/stubs/setuptools/setuptools/warnings.pyi
@@ -1,10 +1,14 @@
+from typing_extensions import TypeAlias
+
+_DueDate: TypeAlias = tuple[int, int, int]  # time tuple
+
 class SetuptoolsWarning(UserWarning):
     @classmethod
     def emit(
         cls,
         summary: str | None = None,
         details: str | None = None,
-        due_date: tuple[int, int, int] | None = None,
+        due_date: _DueDate | None = None,
         see_docs: str | None = None,
         see_url: str | None = None,
         stacklevel: int = 2,