Migrate mypy config to pyproject.toml (#3936)

Co-authored-by: Charles Patel <charles.patel@apkudo.com>

.gitignore

@@ -4,6 +4,7 @@
 _build
 .DS_Store
 .vscode
+.python-version
 docs/_static/pypi.svg
 .tox
 __pycache__

.pre-commit-config.yaml

@@ -43,6 +43,7 @@ repos:
     hooks:
       - id: mypy
         exclude: ^docs/conf.py
+        args: ["--config-file", "pyproject.toml"]
         additional_dependencies:
           - types-PyYAML
           - tomli >= 0.2.6, < 2.0.0
@@ -51,6 +52,10 @@ repos:
           - platformdirs >= 2.1.0
           - pytest
           - hypothesis
+          - aiohttp >= 3.7.4
+          - types-commonmark
+          - urllib3
+          - hypothesmith
 
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v3.0.3

pyproject.toml

@@ -137,6 +137,7 @@ exclude = [
   # Compiled modules can't be run directly and that's a problem here:
   "/src/black/__main__.py",
 ]
+mypy-args = ["--ignore-missing-imports"]
 options = { debug_level = "0" }
 
 [tool.cibuildwheel]
@@ -223,3 +224,26 @@ omit = [
 ]
 [tool.coverage.run]
 relative_files = true
+
+[tool.mypy]
+# Specify the target platform details in config, so your developers are
+# free to run mypy on Windows, Linux, or macOS and get consistent
+# results.
+python_version = "3.8"
+mypy_path = "src"
+strict = true
+# Unreachable blocks have been an issue when compiling mypyc, let's try to avoid 'em in the first place.
+warn_unreachable = true
+implicit_reexport = true
+show_error_codes = true
+show_column_numbers = true
+
+[[tool.mypy.overrides]]
+module = ["pathspec.*", "IPython.*", "colorama.*", "tokenize_rt.*", "uvloop.*", "_black_version.*"]
+ignore_missing_imports = true
+
+# CI only checks src/, but in case users are running LSP or similar we explicitly ignore
+# errors in test data files.
+[[tool.mypy.overrides]]
+module = ["tests.data.*"]
+ignore_errors = true

scripts/check_pre_commit_rev_in_example.py

@@ -14,7 +14,7 @@
 
 import commonmark
 import yaml
-from bs4 import BeautifulSoup
+from bs4 import BeautifulSoup  # type: ignore[import]
 
 
 def main(changes: str, source_version_control: str) -> None:

scripts/check_version_in_basics_example.py

@@ -8,7 +8,7 @@
 import sys
 
 import commonmark
-from bs4 import BeautifulSoup
+from bs4 import BeautifulSoup  # type: ignore[import]
 
 
 def main(changes: str, the_basics: str) -> None:

scripts/diff_shades_gha_helper.py

@@ -119,7 +119,7 @@ def main() -> None:
 @main.command("config", help="Acquire run configuration and metadata.")
 @click.argument("event", type=click.Choice(["push", "pull_request"]))
 def config(event: Literal["push", "pull_request"]) -> None:
-    import diff_shades
+    import diff_shades  # type: ignore[import]
 
     if event == "push":
         jobs = [{"mode": "preview-changes", "force-flag": "--force-preview-style"}]

scripts/fuzz.py

@@ -80,7 +80,7 @@ def test_idempotent_any_syntatically_valid_python(
     try:
         import sys
 
-        import atheris
+        import atheris  # type: ignore[import]
     except ImportError:
         pass
     else:

scripts/make_width_table.py

@@ -20,7 +20,7 @@
 from os.path import basename, dirname, join
 from typing import Iterable, Tuple
 
-import wcwidth
+import wcwidth  # type: ignore[import]
 
 
 def make_width_table() -> Iterable[Tuple[int, int, int]]:

src/blackd/__init__.py

@@ -74,7 +74,9 @@ def main(bind_host: str, bind_port: int) -> None:
     app = make_app()
     ver = black.__version__
     black.out(f"blackd version {ver} listening on {bind_host} port {bind_port}")
-    web.run_app(app, host=bind_host, port=bind_port, handle_signals=True, print=None)
+    # TODO: aiohttp had an incorrect annotation for `print` argument,
+    #  It'll be fixed once aiohttp releases that code
+    web.run_app(app, host=bind_host, port=bind_port, handle_signals=True, print=None)  # type: ignore[arg-type]
 
 
 def make_app() -> web.Application:

tests/optional.py

@@ -26,7 +26,7 @@
     from pytest import StashKey
 except ImportError:
     # pytest < 7
-    from _pytest.store import StoreKey as StashKey  # type: ignore[no-redef]
+    from _pytest.store import StoreKey as StashKey  # type: ignore[import, no-redef]
 
 log = logging.getLogger(__name__)
 

tests/test_blackd.py

@@ -31,7 +31,7 @@ def unittest_run_loop(func, *args, **kwargs):
 
 
 @pytest.mark.blackd
-class BlackDTestCase(AioHTTPTestCase):  # type: ignore[misc]
+class BlackDTestCase(AioHTTPTestCase):
     def test_blackd_main(self) -> None:
         with patch("blackd.web.run_app"):
             result = CliRunner().invoke(blackd.main, [])