🧪 Run MyPy against supported Python range

This patch moves the MyPy invocation from `Makefile` to the
`pre-commit` tool and introduces a number of runtimes to check.

.pre-commit-config.yaml

@@ -84,6 +84,50 @@ repos:
       ^[^/]+[.]rst$
     exclude: >-
       ^CHANGES\.rst$
+
+- repo: https://github.com/pre-commit/mirrors-mypy.git
+  rev: v1.7.1
+  hooks:
+  - id: mypy
+    alias: mypy-py312
+    name: MyPy, for Python 3.12
+    additional_dependencies:
+    - lxml  # requirement of `--txt-report`
+    args:
+    - --show-error-codes
+    - --install-types
+    - --non-interactive
+    - --python-version=3.12
+    - --txt-report=.tox/.tmp/.mypy/python-3.12
+    - frozenlist/
+    pass_filenames: false
+  - id: mypy
+    alias: mypy-py310
+    name: MyPy, for Python 3.10
+    additional_dependencies:
+    - lxml  # requirement of `--txt-report`
+    args:
+    - --show-error-codes
+    - --install-types
+    - --non-interactive
+    - --python-version=3.10
+    - --txt-report=.tox/.tmp/.mypy/python-3.10
+    - frozenlist/
+    pass_filenames: false
+  - id: mypy
+    alias: mypy-py38
+    name: MyPy, for Python 3.8
+    additional_dependencies:
+    - lxml  # requirement of `--txt-report`
+    args:
+    - --show-error-codes
+    - --install-types
+    - --non-interactive
+    - --python-version=3.8
+    - --txt-report=.tox/.tmp/.mypy/python-3.8
+    - frozenlist/
+    pass_filenames: false
+
 - repo: https://github.com/rhysd/actionlint
   rev: v1.6.26
   hooks:

Makefile

@@ -23,9 +23,10 @@ endif
 
 lint: .install-deps
 ifndef CI
-	python -m pre_commit run --all-files
+	python -Im pre_commit run --all-files
+else
+	python -Im pre_commit run mypy --all-files
 endif
-	python -m mypy frozenlist --show-error-codes
 
 .develop: .install-deps $(shell find frozenlist -type f) lint
 	pip install -e .

mypy.ini

@@ -1,5 +1,6 @@
 [mypy]
 follow_imports = silent
+show_error_codes = true
 strict_optional = True
 warn_redundant_casts = True
 

requirements/ci.txt

@@ -1,7 +1,6 @@
 build==1.0.3
 coverage==7.3.2
 cython==3.0.6
-mypy==1.7.1; implementation_name=="cpython"
 pre-commit==3.5.0
 pytest==7.4.3
 pytest-cov==4.1.0