chore: use if TYPE_CHECKING: blocks (#2866)

.pre-commit-config.yaml

@@ -18,7 +18,7 @@ repos:
     exclude: ^cibuildwheel/resources/android/android.patch$
 
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: 6fec9b7edb08fd9989088709d864a7826dc74e80  # frozen: v0.15.12
+  rev: 0c7b6c989466a93942def1f84baf36ddfcd60c83  # frozen: v0.15.14
   hooks:
   - id: ruff-check
     args: ["--fix"]

bin/inspect_all_known_projects.py

@@ -24,8 +24,9 @@ This will cache the results to all_known_setup.yaml; you can reprint
 the results without the `--online` setting.
 """
 
+from __future__ import annotations
+
 import ast
-from collections.abc import Iterable, Iterator
 from pathlib import Path
 
 import click
@@ -35,6 +36,10 @@ from rich import print
 
 from cibuildwheel.projectfiles import Analyzer
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Iterable, Iterator
+
 DIR = Path(__file__).parent.resolve()
 
 

bin/projects.py

@@ -17,13 +17,14 @@ Suggested usage:
     git diff
 """
 
+from __future__ import annotations
+
 import builtins
 import functools
 import textwrap
 import urllib.error
 import urllib.request
 import xml.dom.minidom
-from collections.abc import Iterable, Mapping, Sequence
 from datetime import UTC, datetime
 from io import StringIO
 from pathlib import Path
@@ -33,6 +34,10 @@ import click
 import yaml
 from github import Auth, Github, GithubException
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Iterable, Mapping, Sequence
+
 ICONS = (
     "github",
     "azurepipelines",

bin/update_pythons.py

@@ -12,14 +12,13 @@
 # [tool.uv.sources]
 # cibuildwheel = { path = ".." }
 # ///
-
+from __future__ import annotations
 
 import difflib
 import logging
 import operator
 import re
 import tomllib
-from collections.abc import Mapping, MutableMapping
 from pathlib import Path
 from typing import Any, Final, Literal, TypedDict
 from xml.etree import ElementTree as ET
@@ -35,6 +34,10 @@ from rich.syntax import Syntax
 from cibuildwheel.extra import dump_python_configurations, get_pyodide_xbuildenv_info
 from cibuildwheel.platforms.android import android_triplet
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Mapping, MutableMapping
+
 log = logging.getLogger("cibw")
 
 # Looking up the dir instead of using utils.resources_dir

cibuildwheel/__main__.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import argparse
 import contextlib
 import dataclasses
@@ -8,10 +10,8 @@ import sys
 import textwrap
 import traceback
 import typing
-from collections.abc import Generator, Iterable, Sequence
 from pathlib import Path
 from tempfile import mkdtemp
-from typing import Any, Literal, TextIO
 
 import cibuildwheel
 from cibuildwheel import errors
@@ -27,6 +27,11 @@ from cibuildwheel.util.file import CIBW_CACHE_PATH, ensure_cache_sentinel
 from cibuildwheel.util.helpers import strtobool
 from cibuildwheel.util.resources import read_all_configs
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Generator, Iterable, Sequence
+    from typing import Any, Literal, TextIO
+
 
 @dataclasses.dataclass
 class GlobalOptions:

cibuildwheel/architecture.py

@@ -1,15 +1,21 @@
+from __future__ import annotations
+
 import platform as platform_module
 import re
 import shutil
 import subprocess
 import sys
 import typing
-from collections.abc import Set
 from enum import StrEnum, auto
-from typing import Final, Literal, Self
 
 from cibuildwheel import errors
-from cibuildwheel.typing import PlatformName
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Set
+    from typing import Final, Literal, Self
+
+    from cibuildwheel.typing import PlatformName
 
 PRETTY_NAMES: Final[dict[PlatformName, str]] = {
     "linux": "Linux",

cibuildwheel/audit.py

@@ -1,15 +1,20 @@
+from __future__ import annotations
+
 import subprocess
 import sys
 from pathlib import Path
 
 from cibuildwheel import errors
 from cibuildwheel.logger import log
-from cibuildwheel.options import BuildOptions
 from cibuildwheel.util.cmd import call, shell
 from cibuildwheel.util.helpers import prepare_command
 from cibuildwheel.util.packaging import is_abi3_wheel
 from cibuildwheel.venv import activate_virtualenv, find_uv, virtualenv
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from cibuildwheel.options import BuildOptions
+
 
 def run_audit(
     *,

cibuildwheel/bashlex_eval.py

@@ -1,16 +1,21 @@
+from __future__ import annotations
+
 import dataclasses
 import subprocess
-from collections.abc import (
-    Callable,
-    Iterable,
-    Mapping,
-    Sequence,
-)
 
 import bashlex
 
-# a function that takes a command and the environment, and returns the result
-EnvironmentExecutor = Callable[[list[str], dict[str, str]], str]
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import (
+        Callable,
+        Iterable,
+        Mapping,
+        Sequence,
+    )
+
+    # a function that takes a command and the environment, and returns the result
+    EnvironmentExecutor = Callable[[list[str], dict[str, str]], str]
 
 
 def local_environment_executor(command: Sequence[str], env: Mapping[str, str]) -> str:

cibuildwheel/environment.py

@@ -1,12 +1,18 @@
+from __future__ import annotations
+
 import dataclasses
-from collections.abc import Mapping, Sequence
-from typing import Any, Protocol
+from typing import Protocol
 
 import bashlex
 import bashlex.errors
 
 from cibuildwheel import bashlex_eval
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Mapping, Sequence
+    from typing import Any
+
 
 class EnvironmentParseError(Exception):
     pass

cibuildwheel/extra.py

@@ -2,17 +2,24 @@
 These are utilities for the `/bin` scripts, not for the `cibuildwheel` program.
 """
 
+from __future__ import annotations
+
 import json
 import time
 import typing
 import urllib.error
 import urllib.request
-from collections.abc import Mapping, Sequence
 from io import StringIO
-from typing import Any, NotRequired, Protocol
+from typing import NotRequired, Protocol
 
 from cibuildwheel import __version__ as cibw_version
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Mapping, Sequence
+    from typing import Any
+
+
 __all__ = ("Printable", "dump_python_configurations")
 
 

cibuildwheel/frontend.py

@@ -1,12 +1,19 @@
+from __future__ import annotations
+
 import dataclasses
 import shlex
 import typing
-from collections.abc import Sequence
-from typing import Literal, Self, get_args
+from typing import Literal, get_args
 
-from cibuildwheel.typing import PathOrStr
 from cibuildwheel.util.helpers import parse_key_value_string, prepare_command
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+    from typing import Self
+
+    from cibuildwheel.typing import PathOrStr
+
 BuildFrontendName = Literal["pip", "build", "build[uv]", "uv"]
 
 

cibuildwheel/logger.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import codecs
 import contextlib
 import dataclasses
@@ -9,9 +11,7 @@ import re
 import sys
 import textwrap
 import time
-from collections.abc import Generator
 from pathlib import Path
-from typing import IO, AnyStr, Final, Literal
 
 import humanize
 
@@ -19,9 +19,13 @@ from cibuildwheel.ci import CIProvider, detect_ci_provider, filter_ansi_codes
 
 TYPE_CHECKING = False
 if TYPE_CHECKING:
+    from collections.abc import Generator
+    from typing import IO, AnyStr, Final, Literal
+
     from cibuildwheel.options import Options
 
-FoldPattern = tuple[str, str]
+    FoldPattern = tuple[str, str]
+
 DEFAULT_FOLD_PATTERN: Final[FoldPattern] = ("{name}", "")
 FOLD_PATTERNS: Final[dict[str, FoldPattern]] = {
     "azure": ("##[group]{name}", "##[endgroup]"),
@@ -235,7 +239,7 @@ class Logger:
             print(f"cibuildwheel: {c.bright_red}error{c.end}: {error}\n", file=sys.stderr)
 
     @contextlib.contextmanager
-    def print_summary(self, *, options: "Options") -> Generator[None, None, None]:
+    def print_summary(self, *, options: Options) -> Generator[None, None, None]:
         start = time.time()
         yield
         duration = time.time() - start
@@ -293,7 +297,7 @@ class Logger:
         # lowercase, shorten
         return identifier.lower()[:20]
 
-    def _github_step_summary(self, duration: float, options: "Options") -> str:
+    def _github_step_summary(self, duration: float, options: Options) -> str:
         """
         Returns the GitHub step summary, in markdown format.
         """

cibuildwheel/oci_container.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import dataclasses
 import io
 import json
@@ -10,19 +12,25 @@ import sys
 import textwrap
 import typing
 import uuid
-from collections.abc import Mapping, Sequence
 from enum import Enum
-from pathlib import Path, PurePath, PurePosixPath
-from types import TracebackType
-from typing import IO, Literal, Self, assert_never
+from pathlib import PurePosixPath
+from typing import Literal, assert_never
 
 from cibuildwheel.ci import CIProvider, detect_ci_provider
 from cibuildwheel.errors import OCIEngineTooOldError
 from cibuildwheel.logger import log
-from cibuildwheel.typing import PathOrStr
 from cibuildwheel.util.cmd import call
 from cibuildwheel.util.helpers import FlexibleVersion, parse_key_value_string, strtobool
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Mapping, Sequence
+    from pathlib import Path, PurePath
+    from types import TracebackType
+    from typing import IO, Self
+
+    from cibuildwheel.typing import PathOrStr
+
 ContainerEngineName = Literal["docker", "podman"]
 
 

cibuildwheel/options.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import collections
 import configparser
 import contextlib
@@ -8,9 +10,9 @@ import functools
 import shlex
 import textwrap
 import tomllib
-from collections.abc import Callable, Generator, Iterable, Mapping, Sequence, Set
+from collections.abc import Mapping, Sequence
 from pathlib import Path
-from typing import Any, Final, Literal, Self, assert_never
+from typing import assert_never
 
 from packaging.specifiers import SpecifierSet
 
@@ -27,6 +29,11 @@ from cibuildwheel.util import resources
 from cibuildwheel.util.helpers import format_safe, parse_key_value_string, strtobool, unwrap
 from cibuildwheel.util.packaging import DependencyConstraints
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Callable, Generator, Iterable, Set
+    from typing import Any, Final, Literal, Self
+
 MANYLINUX_ARCHS: Final[tuple[str, ...]] = (
     "x86_64",
     "i686",

cibuildwheel/platforms/__init__.py

@@ -1,14 +1,21 @@
+from __future__ import annotations
+
 import sys
-from collections.abc import Sequence
-from pathlib import Path
-from typing import Final, Protocol
+from typing import Protocol
 
 from cibuildwheel import errors
-from cibuildwheel.architecture import Architecture
-from cibuildwheel.options import Options
 from cibuildwheel.platforms import android, ios, linux, macos, pyodide, windows
-from cibuildwheel.selector import BuildSelector
-from cibuildwheel.typing import GenericPythonConfiguration, PlatformName
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+    from pathlib import Path
+    from typing import Final
+
+    from cibuildwheel.architecture import Architecture
+    from cibuildwheel.options import Options
+    from cibuildwheel.selector import BuildSelector
+    from cibuildwheel.typing import GenericPythonConfiguration, PlatformName
 
 
 class PlatformModule(Protocol):

cibuildwheel/platforms/android.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import csv
 import hashlib
 import os
@@ -7,7 +9,6 @@ import shlex
 import shutil
 import subprocess
 import sysconfig
-from collections.abc import Iterable, Iterator, MutableMapping
 from dataclasses import dataclass
 from os.path import relpath
 from pathlib import Path
@@ -31,8 +32,6 @@ from cibuildwheel.frontend import (
     prepare_config_settings,
 )
 from cibuildwheel.logger import log
-from cibuildwheel.options import BuildOptions, Options
-from cibuildwheel.selector import BuildSelector
 from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call, shell
 from cibuildwheel.util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
@@ -41,8 +40,14 @@ from cibuildwheel.util.packaging import find_compatible_wheel
 from cibuildwheel.util.python_build_standalone import create_python_build_standalone_environment
 from cibuildwheel.venv import constraint_flags, find_uv, virtualenv
 
-RESOURCES_ANDROID = resources.PATH / "android"
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Iterable, Iterator, MutableMapping
 
+    from cibuildwheel.options import BuildOptions, Options
+    from cibuildwheel.selector import BuildSelector
+
+RESOURCES_ANDROID = resources.PATH / "android"
 ANDROID_TRIPLET = {
     "arm64_v8a": "aarch64-linux-android",
     "x86_64": "x86_64-linux-android",

cibuildwheel/platforms/ios.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import dataclasses
 import os
 import platform
@@ -6,7 +8,6 @@ import shutil
 import subprocess
 import sys
 import textwrap
-from collections.abc import Sequence, Set
 from pathlib import Path
 from typing import assert_never
 
@@ -14,18 +15,14 @@ from filelock import FileLock
 from packaging.version import Version
 
 from cibuildwheel import errors
-from cibuildwheel.architecture import Architecture
 from cibuildwheel.audit import run_audit
-from cibuildwheel.environment import ParsedEnvironment
 from cibuildwheel.frontend import (
     BuildFrontendName,
     get_build_frontend_extra_flags,
     prepare_config_settings,
 )
 from cibuildwheel.logger import log
-from cibuildwheel.options import Options
 from cibuildwheel.platforms.macos import install_cpython as install_build_cpython
-from cibuildwheel.selector import BuildSelector
 from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call, shell, split_command
 from cibuildwheel.util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
@@ -33,6 +30,15 @@ from cibuildwheel.util.helpers import prepare_command, unwrap_preserving_paragra
 from cibuildwheel.util.packaging import find_compatible_wheel
 from cibuildwheel.venv import constraint_flags, virtualenv
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Sequence, Set
+
+    from cibuildwheel.architecture import Architecture
+    from cibuildwheel.environment import ParsedEnvironment
+    from cibuildwheel.options import Options
+    from cibuildwheel.selector import BuildSelector
+
 
 @dataclasses.dataclass(frozen=True, kw_only=True)
 class PythonConfiguration:

cibuildwheel/platforms/linux.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import contextlib
 import dataclasses
 import shutil
@@ -5,7 +7,6 @@ import subprocess
 import sys
 import textwrap
 from collections import OrderedDict
-from collections.abc import Iterable, Iterator, Sequence, Set
 from pathlib import Path, PurePath, PurePosixPath
 from typing import assert_never
 
@@ -15,8 +16,6 @@ from cibuildwheel.audit import needs_audit, run_audit
 from cibuildwheel.frontend import get_build_frontend_extra_flags, prepare_config_settings
 from cibuildwheel.logger import log
 from cibuildwheel.oci_container import OCIContainer, OCIContainerEngineConfig, OCIPlatform
-from cibuildwheel.options import BuildOptions, Options
-from cibuildwheel.selector import BuildSelector
 from cibuildwheel.util import resources
 from cibuildwheel.util.file import copy_test_sources
 from cibuildwheel.util.helpers import prepare_command, unwrap
@@ -24,6 +23,10 @@ from cibuildwheel.util.packaging import find_compatible_wheel
 
 TYPE_CHECKING = False
 if TYPE_CHECKING:
+    from collections.abc import Iterable, Iterator, Sequence, Set
+
+    from cibuildwheel.options import BuildOptions, Options
+    from cibuildwheel.selector import BuildSelector
     from cibuildwheel.typing import PathOrStr
 
 ARCHITECTURE_OCI_PLATFORM_MAP = {

cibuildwheel/platforms/macos.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import dataclasses
 import functools
 import inspect
@@ -8,26 +10,21 @@ import shutil
 import subprocess
 import sys
 import typing
-from collections.abc import Set
 from pathlib import Path
-from typing import Literal, assert_never
+from typing import assert_never
 
 from filelock import FileLock
 from packaging.version import Version
 
 from cibuildwheel import errors
-from cibuildwheel.architecture import Architecture
 from cibuildwheel.audit import run_audit
 from cibuildwheel.ci import detect_ci_provider
-from cibuildwheel.environment import ParsedEnvironment
 from cibuildwheel.frontend import (
     BuildFrontendName,
     get_build_frontend_extra_flags,
     prepare_config_settings,
 )
 from cibuildwheel.logger import log
-from cibuildwheel.options import Options
-from cibuildwheel.selector import BuildSelector
 from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call, shell
 from cibuildwheel.util.file import CIBW_CACHE_PATH, copy_test_sources, download, move_file
@@ -35,6 +32,16 @@ from cibuildwheel.util.helpers import prepare_command, unwrap
 from cibuildwheel.util.packaging import find_compatible_wheel, get_pip_version
 from cibuildwheel.venv import constraint_flags, find_uv, target_marker_env, virtualenv
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Set
+    from typing import Literal
+
+    from cibuildwheel.architecture import Architecture
+    from cibuildwheel.environment import ParsedEnvironment
+    from cibuildwheel.options import Options
+    from cibuildwheel.selector import BuildSelector
+
 
 @functools.cache
 def get_macos_version() -> tuple[int, int]:

cibuildwheel/platforms/pyodide.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import dataclasses
 import functools
 import json
@@ -7,7 +9,6 @@ import subprocess
 import sys
 import tomllib
 import typing
-from collections.abc import Set
 from pathlib import Path
 from tempfile import TemporaryDirectory
 from typing import Final, TypedDict
@@ -17,11 +18,8 @@ from filelock import FileLock
 from cibuildwheel import errors
 from cibuildwheel.architecture import Architecture
 from cibuildwheel.audit import run_audit
-from cibuildwheel.environment import ParsedEnvironment
 from cibuildwheel.frontend import get_build_frontend_extra_flags, prepare_config_settings
 from cibuildwheel.logger import log
-from cibuildwheel.options import Options
-from cibuildwheel.selector import BuildSelector
 from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call, shell
 from cibuildwheel.util.file import (
@@ -40,6 +38,14 @@ from cibuildwheel.util.python_build_standalone import (
 )
 from cibuildwheel.venv import constraint_flags, virtualenv
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Set
+
+    from cibuildwheel.environment import ParsedEnvironment
+    from cibuildwheel.options import Options
+    from cibuildwheel.selector import BuildSelector
+
 IS_WIN: Final[bool] = sys.platform.startswith("win")
 
 

cibuildwheel/platforms/windows.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import dataclasses
 import json
 import os
@@ -5,7 +7,6 @@ import platform as platform_module
 import shutil
 import subprocess
 import textwrap
-from collections.abc import MutableMapping, Sequence, Set
 from functools import cache
 from pathlib import Path
 from typing import assert_never
@@ -15,15 +16,12 @@ from filelock import FileLock
 from cibuildwheel import errors
 from cibuildwheel.architecture import Architecture
 from cibuildwheel.audit import run_audit
-from cibuildwheel.environment import ParsedEnvironment
 from cibuildwheel.frontend import (
     BuildFrontendName,
     get_build_frontend_extra_flags,
     prepare_config_settings,
 )
 from cibuildwheel.logger import log
-from cibuildwheel.options import Options
-from cibuildwheel.selector import BuildSelector
 from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call, shell
 from cibuildwheel.util.file import (
@@ -37,6 +35,14 @@ from cibuildwheel.util.helpers import prepare_command, unwrap
 from cibuildwheel.util.packaging import find_compatible_wheel, get_pip_version
 from cibuildwheel.venv import constraint_flags, find_uv, target_marker_env, virtualenv
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import MutableMapping, Sequence, Set
+
+    from cibuildwheel.environment import ParsedEnvironment
+    from cibuildwheel.options import Options
+    from cibuildwheel.selector import BuildSelector
+
 
 def get_nuget_args(
     version: str, arch: str, free_threaded: bool, output_directory: Path

cibuildwheel/projectfiles.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import ast
 import configparser
 import contextlib
-from pathlib import Path
-from typing import Any
 
 import dependency_groups
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+    from typing import Any
+
 
 def get_parent(node: ast.AST | None, depth: int = 1) -> ast.AST | None:
     for _ in range(depth):

cibuildwheel/schema.py

@@ -1,8 +1,13 @@
+from __future__ import annotations
+
 import json
-from typing import Any
 
 from cibuildwheel.util import resources
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Any
+
 
 def get_schema(tool_name: str = "cibuildwheel") -> dict[str, Any]:
     "Get the stored complete schema for cibuildwheel settings."

cibuildwheel/selector.py

@@ -1,13 +1,19 @@
+from __future__ import annotations
+
 import dataclasses
 import itertools
 from enum import StrEnum
 from fnmatch import fnmatch
-from typing import Self
 
 import bracex
-from packaging.specifiers import SpecifierSet
 from packaging.version import Version
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Self
+
+    from packaging.specifiers import SpecifierSet
+
 
 def selector_matches(patterns: str, string: str) -> bool:
     """

cibuildwheel/util/cmd.py

@@ -1,14 +1,20 @@
+from __future__ import annotations
+
 import os
 import shlex
 import shutil
 import subprocess
 import sys
 import typing
-from collections.abc import Iterator, Mapping
-from typing import Final, Literal
 
 from cibuildwheel.errors import FatalError
-from cibuildwheel.typing import PathOrStr
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Iterator, Mapping
+    from typing import Final, Literal
+
+    from cibuildwheel.typing import PathOrStr
 
 _IS_WIN: Final[bool] = sys.platform.startswith("win")
 

cibuildwheel/util/file.py

@@ -1,10 +1,11 @@
+from __future__ import annotations
+
 import os
 import shutil
 import ssl
 import tarfile
 import time
 import urllib.request
-from collections.abc import Callable
 from pathlib import Path, PurePath
 from typing import Final
 from zipfile import ZipFile
@@ -14,6 +15,10 @@ from platformdirs import user_cache_path
 
 from cibuildwheel.errors import FatalError
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Callable
+
 DEFAULT_CIBW_CACHE_PATH: Final[Path] = user_cache_path(appname="cibuildwheel", appauthor="pypa")
 CIBW_CACHE_PATH: Final[Path] = Path(
     os.environ.get("CIBW_CACHE_PATH", DEFAULT_CIBW_CACHE_PATH)

cibuildwheel/util/helpers.py

@@ -1,13 +1,18 @@
+from __future__ import annotations
+
 import dataclasses
 import itertools
-import os
 import re
 import shlex
 import textwrap
 from collections import defaultdict
-from collections.abc import Sequence
 
-from cibuildwheel.typing import PathOrStr
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    import os
+    from collections.abc import Sequence
+
+    from cibuildwheel.typing import PathOrStr
 
 
 def format_safe(template: str, **kwargs: str | os.PathLike[str]) -> str:

cibuildwheel/util/packaging.py

@@ -1,8 +1,9 @@
+from __future__ import annotations
+
 import shlex
-from collections.abc import Mapping, Sequence
 from dataclasses import dataclass, field
 from pathlib import Path, PurePath
-from typing import Literal, Self, TypeVar
+from typing import TypeVar
 
 from packaging.utils import parse_wheel_filename
 
@@ -10,6 +11,11 @@ from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call
 from cibuildwheel.util.helpers import parse_key_value_string, unwrap
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Mapping, Sequence
+    from typing import Literal, Self
+
 
 @dataclass(kw_only=True)
 class DependencyConstraints:

cibuildwheel/util/python_build_standalone.py

@@ -1,15 +1,20 @@
+from __future__ import annotations
+
 import fnmatch
 import functools
 import json
 import platform
 import typing
-from pathlib import Path
 
 from filelock import FileLock
 
 from cibuildwheel.util.file import download, extract_tar
 from cibuildwheel.util.resources import PYTHON_BUILD_STANDALONE_RELEASES
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 class PythonBuildStandaloneAsset(typing.TypedDict):
     name: str

cibuildwheel/util/resources.py

@@ -1,9 +1,14 @@
+from __future__ import annotations
+
 import functools
 import tomllib
 from pathlib import Path
-from typing import Final
 
-from cibuildwheel.typing import PlatformName
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Final
+
+    from cibuildwheel.typing import PlatformName
 
 PATH: Final[Path] = Path(__file__).parent.parent / "resources"
 INSTALL_CERTIFI_SCRIPT: Final[Path] = PATH / "install_certifi.py"

cibuildwheel/venv.py

@@ -1,12 +1,13 @@
+from __future__ import annotations
+
 import contextlib
 import functools
 import os
 import shutil
 import sys
 import tomllib
-from collections.abc import Sequence
 from pathlib import Path
-from typing import Final, cast
+from typing import cast
 
 from filelock import FileLock
 from packaging.markers import default_environment
@@ -17,6 +18,11 @@ from cibuildwheel.util import resources
 from cibuildwheel.util.cmd import call
 from cibuildwheel.util.file import CIBW_CACHE_PATH, download
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+    from typing import Final
+
 _IS_WIN: Final[bool] = sys.platform.startswith("win")
 
 

pyproject.toml

@@ -224,6 +224,7 @@ flake8-unused-arguments.ignore-variadic-names = true
 flake8-tidy-imports.ban-relative-imports = "all"
 flake8-annotations.allow-star-arg-any = true
 flake8-annotations.mypy-init-return = true
+future-annotations = true
 
 [tool.ruff.lint.flake8-tidy-imports.banned-api]
 "typing.Mapping".msg = "Use collections.abc.Mapping instead."

test/conftest.py

@@ -1,7 +1,8 @@
+from __future__ import annotations
+
 import json
 import os
 import subprocess
-from collections.abc import Generator
 
 import pytest
 from filelock import FileLock
@@ -16,6 +17,10 @@ from cibuildwheel.venv import find_uv
 from . import utils
 from .utils import DEFAULT_CIBW_ENABLE, EMULATED_ARCHS, get_platform
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Generator
+
 
 def pytest_addoption(parser: pytest.Parser) -> None:
     parser.addoption(

test/test_0_basic.py

@@ -1,5 +1,6 @@
+from __future__ import annotations
+
 import textwrap
-from pathlib import Path
 
 import packaging.utils
 import pytest
@@ -9,6 +10,10 @@ from cibuildwheel.selector import EnableGroup
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 basic_project = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         """

test/test_abi3audit.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import subprocess
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 pyproject_toml = r"""
 [build-system]
 requires = ["setuptools", "wheel"]

test/test_abi_variants.py

@@ -1,10 +1,15 @@
-import textwrap
-from pathlib import Path
+from __future__ import annotations
 
-import pytest
+import textwrap
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    import pytest
+
 pyproject_toml = r"""
 [build-system]
 requires = ["setuptools", "wheel"]

test/test_before_all.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import subprocess
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_before_build_asserts = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         r"""

test/test_before_build.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import subprocess
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 # pyodide does not support building without isolation, need to check the base_prefix
 SYS_PREFIX = f"sys.{'base_' if utils.get_platform() == 'pyodide' else ''}prefix"
 

test/test_before_test.py

@@ -1,7 +1,11 @@
-from pathlib import Path
+from __future__ import annotations
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 before_test_project = test_projects.new_c_project()
 before_test_project.files["test/spam_test.py"] = r"""
 import sys

test/test_build_frontend_args.py

@@ -1,10 +1,15 @@
+from __future__ import annotations
+
 import subprocess
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 @pytest.mark.parametrize(
     "frontend_name",

test/test_build_skip.py

@@ -1,8 +1,13 @@
+from __future__ import annotations
+
 import textwrap
-from pathlib import Path
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_skip_asserts = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         rf"""

test/test_container_engine.py

@@ -1,9 +1,13 @@
-from pathlib import Path
+from __future__ import annotations
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 basic_project = test_projects.new_c_project()
 
 

test/test_container_images.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import platform
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 dockcross_only_project = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         r"""

test/test_cpp_standards.py

@@ -1,10 +1,14 @@
-from pathlib import Path
+from __future__ import annotations
 
 import jinja2
 
 from . import utils
 from .test_projects import TestProject
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 cpp_test_project = TestProject()
 
 setup_py_template = r"""

test/test_custom_repair_wheel.py

@@ -1,7 +1,8 @@
+from __future__ import annotations
+
 import subprocess
 import textwrap
 from contextlib import nullcontext as does_not_raise
-from pathlib import Path
 
 import pytest
 
@@ -9,6 +10,10 @@ from test import test_projects
 
 from . import utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 basic_project = test_projects.new_c_project()
 basic_project.files["repair.py"] = """
 import shutil

test/test_dependency_versions.py

@@ -1,8 +1,9 @@
+from __future__ import annotations
+
 import json
 import re
 import subprocess
 import textwrap
-from pathlib import Path
 
 import pytest
 
@@ -10,6 +11,10 @@ from cibuildwheel.util import resources
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 VERSION_REGEX = r"([\w-]+)==([^;\s]+)"
 
 CHECK_VERSIONS_SCRIPT = """\

test/test_emulation.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import itertools
 import subprocess
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_a_test = test_projects.new_c_project()
 
 project_with_a_test.files["test/spam_test.py"] = r"""

test/test_environment.py

@@ -1,13 +1,18 @@
+from __future__ import annotations
+
 import os
 import subprocess
 import sys
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_environment_asserts = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         r"""

test/test_from_sdist.py

@@ -1,17 +1,22 @@
+from __future__ import annotations
+
 import os
 import subprocess
 import sys
 import textwrap
-from collections.abc import Mapping
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
-import pytest
-
-from test.test_projects.base import TestProject
-
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Mapping
+
+    import pytest
+
+    from test.test_projects.base import TestProject
+
 # utilities
 
 

test/test_ios.py

@@ -1,14 +1,19 @@
+from __future__ import annotations
+
 import os
 import platform
 import shutil
 import subprocess
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 pytestmark = pytest.mark.ios
 
 CIBW_PLATFORM = os.environ.get("CIBW_PLATFORM", "ios")

test/test_linux_python.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import platform
 import subprocess
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 def test_python_exist(tmp_path: Path, capfd: pytest.CaptureFixture[str]) -> None:
     if utils.get_platform() != "linux":

test/test_macos_archs.py

@@ -1,10 +1,15 @@
+from __future__ import annotations
+
 import platform
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 basic_project = test_projects.new_c_project()
 basic_project.files["tests/test_suite.py"] = r"""
 import platform

test/test_manylinuxXXXX_only.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import platform
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 # TODO: specify these at runtime according to manylinux_image
 project_with_manylinux_symbols = test_projects.new_c_project(
     spam_c_top_level_add=textwrap.dedent(

test/test_meson_python.py

@@ -1,9 +1,13 @@
-from pathlib import Path
+from __future__ import annotations
 
 import packaging.utils
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 meson_project = test_projects.new_meson_project()
 
 

test/test_musllinux_X_Y_only.py

@@ -1,10 +1,15 @@
+from __future__ import annotations
+
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_manylinux_symbols = test_projects.new_c_project(
     spam_c_top_level_add=textwrap.dedent(
         r"""

test/test_pep518.py

@@ -1,8 +1,14 @@
+from __future__ import annotations
+
 import textwrap
 from pathlib import Path
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 basic_project = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         """

test/test_projects/base.py

@@ -1,8 +1,13 @@
-from pathlib import Path
+from __future__ import annotations
+
 from typing import Any, Self
 
 import jinja2
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 FilesDict = dict[str, str | jinja2.Template]
 TemplateContext = dict[str, Any]
 

test/test_pure_wheel.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import subprocess
 from pathlib import Path
 
@@ -7,6 +9,10 @@ from test import test_projects
 
 from . import utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 pure_python_project = test_projects.TestProject()
 pure_python_project.files["setup.py"] = """
 from setuptools import Extension, setup

test/test_pyodide.py

@@ -1,9 +1,10 @@
+from __future__ import annotations
+
 import contextlib
 import os
 import subprocess
 import sys
 import textwrap
-from pathlib import Path
 
 import pytest
 
@@ -11,6 +12,10 @@ from cibuildwheel.util.file import CIBW_CACHE_PATH
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 pytestmark = pytest.mark.pyodide
 
 CIBW_PLATFORM = os.environ.get("CIBW_PLATFORM", "pyodide")

test/test_ssl.py

@@ -1,10 +1,15 @@
+from __future__ import annotations
+
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_ssl_tests = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         r"""

test/test_subdir_package.py

@@ -1,12 +1,17 @@
+from __future__ import annotations
+
 from pathlib import Path
 
 import jinja2
-import pytest
 
 from . import utils
 from .test_projects import TestProject
 from .test_projects.c import SPAM_C_TEMPLATE
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    import pytest
+
 subdir_package_project = TestProject()
 
 subdir_package_project.files["src/spam/spam.c"] = jinja2.Template(SPAM_C_TEMPLATE)

test/test_testing.py

@@ -1,12 +1,17 @@
+from __future__ import annotations
+
 import inspect
 import subprocess
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_a_test = test_projects.new_c_project(
     setup_cfg_add=textwrap.dedent(
         r"""

test/test_troubleshooting.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import subprocess
-from pathlib import Path
 
 import pytest
 
 from . import utils
 from .test_projects import TestProject, new_c_project
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 SO_FILE_WARNING = "NOTE: Shared object (.so) files found in this project."
 
 

test/test_wheel_tag.py

@@ -1,9 +1,13 @@
-from pathlib import Path
+from __future__ import annotations
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 basic_project = test_projects.new_c_project()
 
 

test/utils.py

@@ -4,11 +4,12 @@ Utility functions used by the cibuildwheel tests.
 This file is added to the PYTHONPATH in the test runner at bin/run_test.py.
 """
 
+from __future__ import annotations
+
 import os
 import platform as pm
 import subprocess
 import sys
-from collections.abc import Generator, Mapping, Sequence
 from pathlib import Path
 from tempfile import TemporaryDirectory
 from typing import Final
@@ -20,6 +21,10 @@ from cibuildwheel.ci import CIProvider, detect_ci_provider
 from cibuildwheel.selector import EnableGroup
 from cibuildwheel.util.file import CIBW_CACHE_PATH
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Generator, Mapping, Sequence
+
 EMULATED_ARCHS: Final[list[str]] = sorted(
     arch.value for arch in (Architecture.all_archs("linux") - Architecture.auto_archs("linux"))
 )

unit_test/architecture_test.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import platform as platform_module
 import shutil
 import sys
@@ -6,7 +8,10 @@ import pytest
 
 import cibuildwheel.architecture
 from cibuildwheel.architecture import Architecture, arch_synonym
-from cibuildwheel.typing import PlatformName
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from cibuildwheel.typing import PlatformName
 
 
 @pytest.fixture(

unit_test/audit_test.py

@@ -1,4 +1,5 @@
-import contextlib
+from __future__ import annotations
+
 import subprocess
 from pathlib import Path
 from unittest.mock import Mock, patch
@@ -8,6 +9,10 @@ import pytest
 from cibuildwheel import errors
 from cibuildwheel.audit import needs_audit, run_audit
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    import contextlib
+
 
 def mock_virtualenv() -> contextlib.AbstractContextManager[Mock]:
     return patch(

unit_test/download_test.py

@@ -1,11 +1,16 @@
+from __future__ import annotations
+
 import ssl
-from pathlib import Path
 
 import certifi
 import pytest
 
 from cibuildwheel.util.file import download
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 DOWNLOAD_URL = "https://cdn.jsdelivr.net/gh/pypa/cibuildwheel@v1.6.3/requirements-dev.txt"
 
 

unit_test/get_platform_test.py

@@ -1,7 +1,7 @@
+from __future__ import annotations
+
 import contextlib
 import sys
-from collections.abc import Generator
-from pathlib import Path
 
 import pytest
 import setuptools._distutils.util
@@ -11,6 +11,9 @@ from cibuildwheel.errors import FatalError
 from cibuildwheel.platforms.windows import PythonConfiguration, setup_setuptools_cross_compile
 
 TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Generator
+    from pathlib import Path
 
 # monkeypatching os.name is too flaky. E.g. It works on my machine, but fails in pipeline
 if not sys.platform.startswith("win") and not TYPE_CHECKING:

unit_test/linux_build_steps_test.py

@@ -1,13 +1,18 @@
-import textwrap
-from pathlib import Path
-from pprint import pprint
+from __future__ import annotations
 
-import pytest
+import textwrap
+from pprint import pprint
 
 import cibuildwheel.platforms.linux
 from cibuildwheel.oci_container import OCIContainerEngineConfig
 from cibuildwheel.options import CommandLineArguments, Options
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    import pytest
+
 
 def test_linux_container_split(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
     """

unit_test/main_commands_test.py

@@ -1,13 +1,18 @@
+from __future__ import annotations
+
 import errno
 import shutil
 import sys
-from pathlib import Path
 
 import pytest
 
 import cibuildwheel.__main__ as main_module
 from cibuildwheel.__main__ import main
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 def test_clean_cache_when_cache_exists(
     tmp_path: Path, monkeypatch: pytest.MonkeyPatch, capfd: pytest.CaptureFixture[str]

unit_test/main_tests/conftest.py

@@ -1,8 +1,9 @@
+from __future__ import annotations
+
 import contextlib
 import platform as platform_module
 import subprocess
 import sys
-from collections.abc import Generator, Iterator
 from pathlib import Path
 from typing import Any
 
@@ -13,6 +14,10 @@ from cibuildwheel.logger import Logger
 from cibuildwheel.platforms import android, ios, linux, macos, pyodide, windows
 from cibuildwheel.util import file
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Generator, Iterator
+
 
 class ArgsInterceptor:
     def __init__(self) -> None:

unit_test/main_tests/main_options_test.py

@@ -1,6 +1,7 @@
+from __future__ import annotations
+
 import sys
 import tomllib
-from collections.abc import Mapping
 from fnmatch import fnmatch
 from pathlib import Path
 
@@ -16,6 +17,8 @@ from cibuildwheel.util.packaging import DependencyConstraints
 
 TYPE_CHECKING = False
 if TYPE_CHECKING:
+    from collections.abc import Mapping
+
     from .conftest import ArgsInterceptor
 
 # CIBW_PLATFORM is tested in main_platform_test.py
@@ -37,7 +40,7 @@ def test_old_free_threaded(
 
 @pytest.mark.usefixtures("platform")
 def test_output_dir(
-    intercepted_build_args: "ArgsInterceptor", monkeypatch: pytest.MonkeyPatch
+    intercepted_build_args: ArgsInterceptor, monkeypatch: pytest.MonkeyPatch
 ) -> None:
     OUTPUT_DIR = Path("some_output_dir")
 
@@ -49,7 +52,7 @@ def test_output_dir(
 
 
 @pytest.mark.usefixtures("platform")
-def test_output_dir_default(intercepted_build_args: "ArgsInterceptor") -> None:
+def test_output_dir_default(intercepted_build_args: ArgsInterceptor) -> None:
     main()
 
     assert intercepted_build_args.args[0].globals.output_dir == Path("wheelhouse").resolve()
@@ -59,7 +62,7 @@ def test_output_dir_default(intercepted_build_args: "ArgsInterceptor") -> None:
 @pytest.mark.parametrize("also_set_environment", [False, True])
 def test_output_dir_argument(
     also_set_environment: bool,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     OUTPUT_DIR = Path("some_output_dir")
@@ -75,7 +78,7 @@ def test_output_dir_argument(
 
 @pytest.mark.usefixtures("platform", "allow_empty")
 def test_build_selector(
-    intercepted_build_args: "ArgsInterceptor", monkeypatch: pytest.MonkeyPatch
+    intercepted_build_args: ArgsInterceptor, monkeypatch: pytest.MonkeyPatch
 ) -> None:
     monkeypatch.setenv("CIBW_BUILD", "cp313-*")
     monkeypatch.setenv("CIBW_SKIP", "cp39-*")
@@ -191,7 +194,7 @@ def test_manylinux_images(
     image: str | None,
     full_image: str,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if image is not None:
@@ -230,7 +233,7 @@ def test_repair_command(
     repair_command: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if repair_command is not None:
@@ -259,7 +262,7 @@ def test_environment(
     environment: Mapping[str, str],
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     env_string = " ".join(f"{k}={v}" for k, v in environment.items())
@@ -284,7 +287,7 @@ def test_test_requires(
     test_requires: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if test_requires is not None:
@@ -307,7 +310,7 @@ def test_audit_requires(
     audit_requires: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if audit_requires is not None:
@@ -331,7 +334,7 @@ def test_test_extras(
     test_extras: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if test_extras is not None:
@@ -354,7 +357,7 @@ def test_test_command(
     test_command: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if test_command is not None:
@@ -377,7 +380,7 @@ def test_before_build(
     before_build: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if before_build is not None:
@@ -399,7 +402,7 @@ def test_build_verbosity(
     build_verbosity: int | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if build_verbosity is not None:
@@ -420,7 +423,7 @@ def test_build_verbosity(
 def test_config_settings(
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     config_settings = (
@@ -507,7 +510,7 @@ def test_before_all(
     before_all: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     if before_all is not None:
@@ -533,7 +536,7 @@ def test_dependency_versions(
     dependency_versions: str | None,
     platform_specific: bool,
     platform: str,
-    intercepted_build_args: "ArgsInterceptor",
+    intercepted_build_args: ArgsInterceptor,
     monkeypatch: pytest.MonkeyPatch,
     tmp_path: Path,
 ) -> None:
@@ -593,7 +596,7 @@ def test_debug_traceback(
 
 @pytest.mark.parametrize("method", ["unset", "command_line", "env_var"])
 def test_enable(
-    method: str, intercepted_build_args: "ArgsInterceptor", monkeypatch: pytest.MonkeyPatch
+    method: str, intercepted_build_args: ArgsInterceptor, monkeypatch: pytest.MonkeyPatch
 ) -> None:
     monkeypatch.delenv("CIBW_ENABLE", raising=False)
 
@@ -613,7 +616,7 @@ def test_enable(
 
 
 def test_enable_all(
-    intercepted_build_args: "ArgsInterceptor", monkeypatch: pytest.MonkeyPatch
+    intercepted_build_args: ArgsInterceptor, monkeypatch: pytest.MonkeyPatch
 ) -> None:
     monkeypatch.setattr(sys, "argv", [*sys.argv, "--enable", "all"])
     monkeypatch.delenv("CIBW_ENABLE", raising=False)
@@ -625,7 +628,7 @@ def test_enable_all(
 
 
 def test_enable_arg_inherits(
-    intercepted_build_args: "ArgsInterceptor", monkeypatch: pytest.MonkeyPatch
+    intercepted_build_args: ArgsInterceptor, monkeypatch: pytest.MonkeyPatch
 ) -> None:
     monkeypatch.setenv("CIBW_ENABLE", "pypy graalpy")
     monkeypatch.setattr(sys, "argv", [*sys.argv, "--enable", "cpython-prerelease"])
@@ -652,7 +655,7 @@ def test_enable_arg_error_message(
     assert "Valid group names are:" in err
 
 
-def test_defaults(platform: str, intercepted_build_args: "ArgsInterceptor") -> None:
+def test_defaults(platform: str, intercepted_build_args: ArgsInterceptor) -> None:
     main()
 
     build_options: BuildOptions = intercepted_build_args.args[0].build_options(identifier=None)

unit_test/main_tests/main_platform_test.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import sys
 
 import pytest
@@ -5,10 +7,14 @@ import pytest
 from cibuildwheel.__main__ import main
 from cibuildwheel.architecture import Architecture
 from cibuildwheel.selector import EnableGroup
-from cibuildwheel.typing import PlatformName
 
 from ..conftest import MOCK_PACKAGE_DIR
-from .conftest import ArgsInterceptor
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from cibuildwheel.typing import PlatformName
+
+    from .conftest import ArgsInterceptor
 
 
 @pytest.mark.parametrize("option_value", [None, "auto", ""])

unit_test/main_tests/main_requires_python_test.py

@@ -1,13 +1,18 @@
+from __future__ import annotations
+
 import sys
 import textwrap
-from pathlib import Path
 
 import pytest
 from packaging.specifiers import SpecifierSet
 
 from cibuildwheel.__main__ import main
 
-from .conftest import ArgsInterceptor
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    from .conftest import ArgsInterceptor
 
 
 @pytest.fixture(autouse=True)

unit_test/oci_container_test.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import contextlib
 import json
 import os
@@ -7,7 +9,6 @@ import subprocess
 import sys
 import textwrap
 import time
-from collections.abc import Iterator
 from contextlib import nullcontext
 from pathlib import Path, PurePath, PurePosixPath
 
@@ -25,6 +26,10 @@ from cibuildwheel.oci_container import (
     _check_engine_version,
 )
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Iterator
+
 # Test utilities
 
 # for these tests we use manylinux2014 images, because they're available on

unit_test/options_test.py

@@ -1,8 +1,9 @@
+from __future__ import annotations
+
 import os
 import platform as platform_module
 import textwrap
 import unittest.mock
-from collections.abc import Sequence
 from pathlib import Path
 from typing import Literal
 
@@ -25,6 +26,10 @@ from cibuildwheel.platforms import ALL_PLATFORM_MODULES, get_build_identifiers
 from cibuildwheel.util import resources
 from cibuildwheel.util.packaging import DependencyConstraints
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+
 PYPROJECT_1 = """
 [tool.cibuildwheel]
 build = ["cp38-*", "cp313-*"]

unit_test/options_toml_test.py

@@ -1,5 +1,6 @@
+from __future__ import annotations
+
 import shlex
-from pathlib import Path
 from typing import Any, cast
 
 import pytest
@@ -13,7 +14,12 @@ from cibuildwheel.options import (
     ShlexTableFormat,
     _resolve_cascade,
 )
-from cibuildwheel.typing import PlatformName
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    from cibuildwheel.typing import PlatformName
 
 PYPROJECT_1 = """
 [tool.cibuildwheel]

unit_test/projectfiles_test.py

@@ -1,5 +1,6 @@
+from __future__ import annotations
+
 import tomllib
-from pathlib import Path
 from textwrap import dedent
 
 import pytest
@@ -10,6 +11,10 @@ from cibuildwheel.projectfiles import (
     setup_py_python_requires,
 )
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 def test_read_setup_py_simple(tmp_path: Path) -> None:
     with open(tmp_path / "setup.py", "w") as f: