From 6bcf807fe2cb82c859fb757a498edfe5692ededa Mon Sep 17 00:00:00 2001
From: Nulano <nulano@nulano.eu>
Date: Wed, 27 Dec 2023 00:17:57 +0100
Subject: [PATCH 1/6] add type hints for _util

---
 pyproject.toml   |  3 +++
 src/PIL/_util.py | 23 +++++++++++++++++++----
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index 193e8c9b2..0c25edeb3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,9 @@ classifiers = [
 dynamic = [
   "version",
 ]
+dependencies = [
+  'typing-extensions; python_version < "3.10"',
+]
 [project.optional-dependencies]
 docs = [
   "furo",
diff --git a/src/PIL/_util.py b/src/PIL/_util.py
index 4634d335b..d11cbfa58 100644
--- a/src/PIL/_util.py
+++ b/src/PIL/_util.py
@@ -1,21 +1,36 @@
 from __future__ import annotations
 
 import os
+import sys
 from pathlib import Path
+from typing import Any, NoReturn
+
+if sys.version_info >= (3, 10):
+    from typing import TypeGuard
+else:
+    from typing_extensions import TypeGuard
 
 
-def is_path(f):
+def is_path(f: Any) -> TypeGuard[bytes | str | Path]:
     return isinstance(f, (bytes, str, Path))
 
 
-def is_directory(f):
+def is_directory(f: Any) -> TypeGuard[bytes | str | Path]:
     """Checks if an object is a string, and that it points to a directory."""
     return is_path(f) and os.path.isdir(f)
 
 
 class DeferredError:
-    def __init__(self, ex):
+    def __init__(self, ex: BaseException):
         self.ex = ex
 
-    def __getattr__(self, elt):
+    def __getattr__(self, elt: str) -> NoReturn:
         raise self.ex
+
+    @staticmethod
+    def new(ex: BaseException) -> Any:
+        """
+        Creates an object that raises the wrapped exception ``ex`` when used,
+        and casts it to :py:obj:`~typing.Any` type.
+        """
+        return DeferredError(ex)

From 90d5552800692d3c9c467eeef406dab984a50e68 Mon Sep 17 00:00:00 2001
From: Nulano <nulano@nulano.eu>
Date: Wed, 27 Dec 2023 00:40:55 +0100
Subject: [PATCH 2/6] use _util.DeferredError.new everywhere

---
 Tests/test_util.py      | 2 +-
 pyproject.toml          | 2 --
 src/PIL/Image.py        | 2 +-
 src/PIL/ImageCms.py     | 2 +-
 src/PIL/ImageFont.py    | 6 +++---
 src/PIL/PyAccess.py     | 2 +-
 src/PIL/_imagingcms.pyi | 5 +++++
 src/PIL/_imagingft.pyi  | 5 +++++
 8 files changed, 17 insertions(+), 9 deletions(-)
 create mode 100644 src/PIL/_imagingcms.pyi
 create mode 100644 src/PIL/_imagingft.pyi

diff --git a/Tests/test_util.py b/Tests/test_util.py
index 1457d85f7..4a312beb4 100644
--- a/Tests/test_util.py
+++ b/Tests/test_util.py
@@ -66,7 +66,7 @@ def test_deferred_error():
     # Arrange
 
     # Act
-    thing = _util.DeferredError(ValueError("Some error text"))
+    thing = _util.DeferredError.new(ValueError("Some error text"))
 
     # Assert
     with pytest.raises(ValueError):
diff --git a/pyproject.toml b/pyproject.toml
index 0c25edeb3..ef0ff8a8e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -144,9 +144,7 @@ exclude = [
   '^src/PIL/DdsImagePlugin.py$',
   '^src/PIL/FpxImagePlugin.py$',
   '^src/PIL/Image.py$',
-  '^src/PIL/ImageCms.py$',
   '^src/PIL/ImageFile.py$',
-  '^src/PIL/ImageFont.py$',
   '^src/PIL/ImageMath.py$',
   '^src/PIL/ImageMorph.py$',
   '^src/PIL/ImageQt.py$',
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index d04801cba..5a2e85419 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -92,7 +92,7 @@ try:
         raise ImportError(msg)
 
 except ImportError as v:
-    core = DeferredError(ImportError("The _imaging C module is not installed."))
+    core = DeferredError.new(ImportError("The _imaging C module is not installed."))
     # Explanations for ways that we know we might have an import error
     if str(v).startswith("Module use of python"):
         # The _imaging C module is present, but not compiled for
diff --git a/src/PIL/ImageCms.py b/src/PIL/ImageCms.py
index 9d27f2513..643fce830 100644
--- a/src/PIL/ImageCms.py
+++ b/src/PIL/ImageCms.py
@@ -28,7 +28,7 @@ except ImportError as ex:
     # anything in core.
     from ._util import DeferredError
 
-    _imagingcms = DeferredError(ex)
+    _imagingcms = DeferredError.new(ex)
 
 DESCRIPTION = """
 pyCMS
diff --git a/src/PIL/ImageFont.py b/src/PIL/ImageFont.py
index 6db7cc4ec..41d8fbc17 100644
--- a/src/PIL/ImageFont.py
+++ b/src/PIL/ImageFont.py
@@ -34,7 +34,7 @@ import warnings
 from enum import IntEnum
 from io import BytesIO
 from pathlib import Path
-from typing import IO
+from typing import BinaryIO
 
 from . import Image
 from ._util import is_directory, is_path
@@ -53,7 +53,7 @@ try:
 except ImportError as ex:
     from ._util import DeferredError
 
-    core = DeferredError(ex)
+    core = DeferredError.new(ex)
 
 
 def _string_length_check(text):
@@ -191,7 +191,7 @@ class FreeTypeFont:
 
     def __init__(
         self,
-        font: bytes | str | Path | IO | None = None,
+        font: bytes | str | Path | BinaryIO | None = None,
         size: float = 10,
         index: int = 0,
         encoding: str = "",
diff --git a/src/PIL/PyAccess.py b/src/PIL/PyAccess.py
index 23ff154f6..07bb712d8 100644
--- a/src/PIL/PyAccess.py
+++ b/src/PIL/PyAccess.py
@@ -43,7 +43,7 @@ except ImportError as ex:
     # anything in core.
     from ._util import DeferredError
 
-    FFI = ffi = DeferredError(ex)
+    FFI = ffi = DeferredError.new(ex)
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/PIL/_imagingcms.pyi b/src/PIL/_imagingcms.pyi
new file mode 100644
index 000000000..b0235555d
--- /dev/null
+++ b/src/PIL/_imagingcms.pyi
@@ -0,0 +1,5 @@
+from __future__ import annotations
+
+from typing import Any
+
+def __getattr__(name: str) -> Any: ...
diff --git a/src/PIL/_imagingft.pyi b/src/PIL/_imagingft.pyi
new file mode 100644
index 000000000..b0235555d
--- /dev/null
+++ b/src/PIL/_imagingft.pyi
@@ -0,0 +1,5 @@
+from __future__ import annotations
+
+from typing import Any
+
+def __getattr__(name: str) -> Any: ...

From cc51dace35bd6e144c3fff05d1b14c78af41c0e0 Mon Sep 17 00:00:00 2001
From: Nulano <nulano@nulano.eu>
Date: Wed, 27 Dec 2023 00:41:30 +0100
Subject: [PATCH 3/6] fix types hints for ImageFile._Tile

---
 pyproject.toml       | 1 -
 src/PIL/ImageFile.py | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index ef0ff8a8e..de707a283 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -144,7 +144,6 @@ exclude = [
   '^src/PIL/DdsImagePlugin.py$',
   '^src/PIL/FpxImagePlugin.py$',
   '^src/PIL/Image.py$',
-  '^src/PIL/ImageFile.py$',
   '^src/PIL/ImageMath.py$',
   '^src/PIL/ImageMorph.py$',
   '^src/PIL/ImageQt.py$',
diff --git a/src/PIL/ImageFile.py b/src/PIL/ImageFile.py
index ae4e23db1..0923979af 100644
--- a/src/PIL/ImageFile.py
+++ b/src/PIL/ImageFile.py
@@ -32,7 +32,7 @@ import io
 import itertools
 import struct
 import sys
-from typing import NamedTuple
+from typing import Any, NamedTuple
 
 from . import Image
 from ._deprecate import deprecate
@@ -94,7 +94,7 @@ class _Tile(NamedTuple):
     encoder_name: str
     extents: tuple[int, int, int, int]
     offset: int
-    args: tuple | str | None
+    args: tuple[Any, ...] | str | None
 
 
 #

From 3a4298d16c660d5dec46cfa372b6aceb79c1e056 Mon Sep 17 00:00:00 2001
From: Nulano <nulano@nulano.eu>
Date: Wed, 27 Dec 2023 14:54:48 +0100
Subject: [PATCH 4/6] avoid hard dependency on typing_extensions

---
 docs/reference/internal_modules.rst | 13 +++++++++++++
 pyproject.toml                      |  6 +++---
 src/PIL/_typing.py                  | 16 ++++++++++++++++
 src/PIL/_util.py                    |  7 +------
 tox.ini                             |  2 ++
 5 files changed, 35 insertions(+), 9 deletions(-)
 create mode 100644 src/PIL/_typing.py

diff --git a/docs/reference/internal_modules.rst b/docs/reference/internal_modules.rst
index 363a67d9b..57dd3f35b 100644
--- a/docs/reference/internal_modules.rst
+++ b/docs/reference/internal_modules.rst
@@ -25,6 +25,19 @@ Internal Modules
     :undoc-members:
     :show-inheritance:
 
+:mod:`~PIL._typing` Module
+--------------------------
+
+.. module:: PIL._typing
+
+Provides a convenient way to import type hints that are not available
+on some supported Python versions.
+
+.. py:data:: TypeGuard
+    :value: typing.TypeGuard
+
+    See :py:obj:`typing.TypeGuard`.
+
 :mod:`~PIL._util` Module
 ------------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index de707a283..abb32f14d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,9 +37,6 @@ classifiers = [
 dynamic = [
   "version",
 ]
-dependencies = [
-  'typing-extensions; python_version < "3.10"',
-]
 [project.optional-dependencies]
 docs = [
   "furo",
@@ -68,6 +65,9 @@ tests = [
   "pytest-cov",
   "pytest-timeout",
 ]
+typing = [
+  'typing-extensions; python_version < "3.10"',
+]
 xmp = [
   "defusedxml",
 ]
diff --git a/src/PIL/_typing.py b/src/PIL/_typing.py
new file mode 100644
index 000000000..583be41b7
--- /dev/null
+++ b/src/PIL/_typing.py
@@ -0,0 +1,16 @@
+import sys
+
+if sys.version_info >= (3, 10):
+    from typing import TypeGuard
+else:
+    try:
+        from typing_extensions import TypeGuard
+    except ImportError:
+        from typing import Any, Type
+
+        class TypeGuard:  # type: ignore[no-redef]
+            def __class_getitem__(cls, item: Any) -> Type[bool]:
+                return bool
+
+
+__all__ = ["TypeGuard"]
diff --git a/src/PIL/_util.py b/src/PIL/_util.py
index d11cbfa58..37cd979f6 100644
--- a/src/PIL/_util.py
+++ b/src/PIL/_util.py
@@ -1,14 +1,9 @@
 from __future__ import annotations
 
 import os
-import sys
 from pathlib import Path
 from typing import Any, NoReturn
-
-if sys.version_info >= (3, 10):
-    from typing import TypeGuard
-else:
-    from typing_extensions import TypeGuard
+from ._typing import TypeGuard
 
 
 def is_path(f: Any) -> TypeGuard[bytes | str | Path]:
diff --git a/tox.ini b/tox.ini
index 034d89372..bfcfaf5d9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,3 +37,5 @@ deps =
     numpy
 commands =
     mypy src {posargs}
+extras =
+    typing

From 0d90bc818789b801170171fe902bc2921850fc11 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Wed, 27 Dec 2023 13:57:20 +0000
Subject: [PATCH 5/6] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 src/PIL/_typing.py | 6 ++++--
 src/PIL/_util.py   | 1 +
 tox.ini            | 4 ++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/PIL/_typing.py b/src/PIL/_typing.py
index 583be41b7..608b2b41f 100644
--- a/src/PIL/_typing.py
+++ b/src/PIL/_typing.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import sys
 
 if sys.version_info >= (3, 10):
@@ -6,10 +8,10 @@ else:
     try:
         from typing_extensions import TypeGuard
     except ImportError:
-        from typing import Any, Type
+        from typing import Any
 
         class TypeGuard:  # type: ignore[no-redef]
-            def __class_getitem__(cls, item: Any) -> Type[bool]:
+            def __class_getitem__(cls, item: Any) -> type[bool]:
                 return bool
 
 
diff --git a/src/PIL/_util.py b/src/PIL/_util.py
index 37cd979f6..13f369cca 100644
--- a/src/PIL/_util.py
+++ b/src/PIL/_util.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 import os
 from pathlib import Path
 from typing import Any, NoReturn
+
 from ._typing import TypeGuard
 
 
diff --git a/tox.ini b/tox.ini
index bfcfaf5d9..d89d017e4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,7 +35,7 @@ skip_install = true
 deps =
     mypy==1.7.1
     numpy
-commands =
-    mypy src {posargs}
 extras =
     typing
+commands =
+    mypy src {posargs}

From de381d0efb96096cb9a56c69711635a8e53417b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ondrej=20Baranovi=C4=8D?= <nulano@nulano.eu>
Date: Wed, 27 Dec 2023 16:17:51 +0100
Subject: [PATCH 6/6] Update docs/reference/internal_modules.rst

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
---
 docs/reference/internal_modules.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/reference/internal_modules.rst b/docs/reference/internal_modules.rst
index 57dd3f35b..f2932c322 100644
--- a/docs/reference/internal_modules.rst
+++ b/docs/reference/internal_modules.rst
@@ -31,7 +31,7 @@ Internal Modules
 .. module:: PIL._typing
 
 Provides a convenient way to import type hints that are not available
-on some supported Python versions.
+on some Python versions.
 
 .. py:data:: TypeGuard
     :value: typing.TypeGuard