From b8605eaa84f88e9cde4fe944f073eff9e7feaf89 Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <hugovk@users.noreply.github.com>
Date: Fri, 30 Jun 2023 18:50:18 +0300
Subject: [PATCH] Check types with mypy

---
 .github/workflows/lint.yml |  6 ++++++
 pyproject.toml             | 31 +++++++++++++++++++++++++++++++
 tox.ini                    |  7 +++++++
 3 files changed, 44 insertions(+)

diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index c8fda7e7f..9069fc615 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -2,6 +2,9 @@ name: Lint
 
 on: [push, pull_request, workflow_dispatch]
 
+env:
+  FORCE_COLOR: 1
+
 permissions:
   contents: read
 
@@ -46,3 +49,6 @@ jobs:
       run: tox -e lint
       env:
         PRE_COMMIT_COLOR: always
+
+    - name: Mypy
+      run: tox -e mypy
diff --git a/pyproject.toml b/pyproject.toml
index f9cea0612..63ee7d42d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -125,3 +125,34 @@ known-first-party = ["PIL"]
 [tool.pytest.ini_options]
 addopts = "-ra --color=yes"
 testpaths = ["Tests"]
+
+[tool.mypy]
+python_version = "3.8"
+pretty = true
+disallow_any_generics = true
+enable_error_code = "ignore-without-code"
+extra_checks = true
+follow_imports = "silent"
+warn_redundant_casts = true
+warn_unreachable = true
+warn_unused_ignores = true
+exclude = [
+  '^src/PIL/_tkinter_finder.py$',
+  '^src/PIL/DdsImagePlugin.py$',
+  '^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$',
+  '^src/PIL/ImageQt.py$',
+  '^src/PIL/ImageShow.py$',
+  '^src/PIL/ImImagePlugin.py$',
+  '^src/PIL/MicImagePlugin.py$',
+  '^src/PIL/PdfParser.py$',
+  '^src/PIL/PyAccess.py$',
+  '^src/PIL/TiffImagePlugin.py$',
+  '^src/PIL/TiffTags.py$',
+  '^src/PIL/WebPImagePlugin.py$',
+]
diff --git a/tox.ini b/tox.ini
index 5388ed243..7121df049 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,3 +29,10 @@ pass_env =
 commands =
     pre-commit run --all-files --show-diff-on-failure
     check-manifest
+
+[testenv:mypy]
+skip_install = true
+deps =
+    mypy==1.7.1
+commands =
+    mypy src {posargs}