Typecheck typeshed's code with pyright

.github/workflows/typecheck_typeshed_code.yml

@@ -40,3 +40,31 @@ jobs:
           cache-dependency-path: requirements-tests.txt
       - run: pip install -r requirements-tests.txt
       - run: python ./tests/typecheck_typeshed.py --platform=${{ matrix.platform }}
+  pyright:
+    name: Run pyright against the scripts and tests directories
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-platform: ["Linux", "Windows"]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.9"
+          cache: pip
+          cache-dependency-path: requirements-tests.txt
+      - run: pip install -r requirements-tests.txt
+      - name: Get pyright version
+        uses: SebRollen/[email protected]
+        id: pyright_version
+        with:
+          file: "pyproject.toml"
+          field: "tool.typeshed.pyright_version"
+      - name: Run pyright on typeshed
+        uses: jakebailey/pyright-action@v1
+        with:
+          version: ${{ steps.pyright_version.outputs.value }}
+          python-platform: ${{ matrix.python-platform }}
+          python-version: "3.9"
+          project: ./pyrightconfig.scripts_and_tests.json

pyrightconfig.scripts_and_tests.json

@@ -0,0 +1,24 @@
+{
+    "$schema": "https://raw.githubusercontent.com/microsoft/pyright/main/packages/vscode-pyright/schemas/pyrightconfig.schema.json",
+    "typeshedPath": ".",
+    "include": [
+        "scripts",
+        "tests",
+    ],
+    "typeCheckingMode": "strict",
+    // Runtime libraries used by typeshed are not all py.typed
+    "useLibraryCodeForTypes": true,
+    // More of a lint. Unwanted for typeshed's own code.
+    "reportImplicitStringConcatenation": "none",
+    // Extra strict settings
+    "reportMissingModuleSource": "error",
+    "reportShadowedImports": "error",
+    "reportCallInDefaultInitializer": "error",
+    "reportPropertyTypeMismatch": "error",
+    "reportUninitializedInstanceVariable": "error",
+    "reportUnnecessaryTypeIgnoreComment": "error",
+    // Leave "type: ignore" comments to mypy
+    "enableTypeIgnoreComments": false,
+    // Too strict
+    "reportMissingSuperCall": "none",
+}

requirements-tests.txt

@@ -15,6 +15,6 @@ pyyaml==6.0
 termcolor>=2
 tomli==2.0.1
 tomlkit==0.11.6
-types-pyyaml
+types-pyyaml>=6.0.12.7
 types-setuptools
 typing-extensions

scripts/runtests.py

@@ -7,8 +7,8 @@
 import re
 import subprocess
 import sys
+from collections.abc import Iterable
 from pathlib import Path
-from typing import Iterable
 
 try:
     from termcolor import colored
@@ -176,7 +176,7 @@ def main() -> None:
         print("stubtest:", _SKIPPED)
     else:
         print("stubtest:", _SUCCESS if stubtest_result.returncode == 0 else _FAILED)
-    if pytype_result is None:
+    if not pytype_result:
         print("pytype:", _SKIPPED)
     else:
         print("pytype:", _SUCCESS if pytype_result.returncode == 0 else _FAILED)

scripts/stubsabot.py

@@ -241,7 +241,7 @@ async def get_github_repo_info(session: aiohttp.ClientSession, pypi_info: PypiIn
                 github_tags_info_url = f"https://api.github.com/repos/{url_path}/tags"
                 async with session.get(github_tags_info_url, headers=get_github_api_headers()) as response:
                     if response.status == 200:
-                        tags = await response.json()
+                        tags: list[dict[str, Any]] = await response.json()
                         assert isinstance(tags, list)
                         return GithubInfo(repo_path=url_path, tags=tags)
     return None
@@ -266,7 +266,7 @@ async def get_diff_info(
     if github_info is None:
         return None
 
-    versions_to_tags = {}
+    versions_to_tags: dict[packaging.version.Version, str] = {}
     for tag in github_info.tags:
         tag_name = tag["name"]
         # Some packages in typeshed (e.g. emoji) have tag names
@@ -378,7 +378,7 @@ def describe_typeshed_files_modified(self) -> str:
         return analysis
 
     def __str__(self) -> str:
-        data_points = []
+        data_points: list[str] = []
         if self.runtime_definitely_has_consistent_directory_structure_with_typeshed:
             data_points += [
                 self.describe_public_files_added(),
@@ -398,7 +398,7 @@ async def analyze_diff(
     url = f"https://api.github.com/repos/{github_repo_path}/compare/{old_tag}...{new_tag}"
     async with session.get(url, headers=get_github_api_headers()) as response:
         response.raise_for_status()
-        json_resp = await response.json()
+        json_resp: dict[str, list[FileInfo]] = await response.json()
         assert isinstance(json_resp, dict)
     # https://docs.github.com/en/rest/commits/commits#compare-two-commits
     py_files: list[FileInfo] = [file for file in json_resp["files"] if Path(file["filename"]).suffix == ".py"]
@@ -581,7 +581,11 @@ def get_update_pr_body(update: Update, metadata: dict[str, Any]) -> str:
     if update.diff_analysis is not None:
         body += f"\n\n{update.diff_analysis}"
 
-    stubtest_will_run = not metadata.get("tool", {}).get("stubtest", {}).get("skip", False)
+    # Loss of type due to infered [dict[Unknown, Unknown]]
+    # scripts/stubsabot.py can't import tests/parse_metadata
+    stubtest_will_run = (
+        not metadata.get("tool", {}).get("stubtest", {}).get("skip", False)  # pyright: ignore[reportUnknownMemberType]
+    )
     if stubtest_will_run:
         body += textwrap.dedent(
             """
@@ -611,10 +615,13 @@ async def suggest_typeshed_update(update: Update, session: aiohttp.ClientSession
         branch_name = f"{BRANCH_PREFIX}/{normalize(update.distribution)}"
         subprocess.check_call(["git", "checkout", "-B", branch_name, "origin/main"])
         with open(update.stub_path / "METADATA.toml", "rb") as f:
-            meta = tomlkit.load(f)
+            # tomlkit.load has partially unknown IO type
+            # https://github.com/sdispater/tomlkit/pull/272
+            meta = tomlkit.load(f)  # pyright: ignore[reportUnknownMemberType]
         meta["version"] = update.new_version_spec
         with open(update.stub_path / "METADATA.toml", "w", encoding="UTF-8") as f:
-            tomlkit.dump(meta, f)
+            # tomlkit.dump has partially unknown IO type
+            tomlkit.dump(meta, f)  # pyright: ignore[reportUnknownMemberType]
         body = get_update_pr_body(update, meta)
         subprocess.check_call(["git", "commit", "--all", "-m", f"{title}\n\n{body}"])
         if action_level <= ActionLevel.local:
@@ -637,12 +644,15 @@ async def suggest_typeshed_obsolete(obsolete: Obsolete, session: aiohttp.ClientS
         branch_name = f"{BRANCH_PREFIX}/{normalize(obsolete.distribution)}"
         subprocess.check_call(["git", "checkout", "-B", branch_name, "origin/main"])
         with open(obsolete.stub_path / "METADATA.toml", "rb") as f:
-            meta = tomlkit.load(f)
+            # tomlkit.load has partially unknown IO type
+            # https://github.com/sdispater/tomlkit/pull/272
+            meta = tomlkit.load(f)  # pyright: ignore[reportUnknownMemberType]
         obs_string = tomlkit.string(obsolete.obsolete_since_version)
         obs_string.comment(f"Released on {obsolete.obsolete_since_date.date().isoformat()}")
         meta["obsolete_since"] = obs_string
         with open(obsolete.stub_path / "METADATA.toml", "w", encoding="UTF-8") as f:
-            tomlkit.dump(meta, f)
+            # tomlkit.dump has partially unknown Mapping type
+            tomlkit.dump(meta, f)  # pyright: ignore[reportUnknownMemberType]
         body = "\n".join(f"{k}: {v}" for k, v in obsolete.links.items())
         subprocess.check_call(["git", "commit", "--all", "-m", f"{title}\n\n{body}"])
         if action_level <= ActionLevel.local:
@@ -727,7 +737,8 @@ async def main() -> None:
                     if isinstance(update, Update):
                         await suggest_typeshed_update(update, session, action_level=args.action_level)
                         continue
-                    if isinstance(update, Obsolete):
+                    # Redundant, but keeping for extra runtime validation
+                    if isinstance(update, Obsolete):  # pyright: ignore[reportUnnecessaryIsInstance]
                         await suggest_typeshed_obsolete(update, session, action_level=args.action_level)
                         continue
                 except RemoteConflict as e:

tests/check_consistent.py

@@ -10,6 +10,7 @@
 import sys
 import urllib.parse
 from pathlib import Path
+from typing import TypedDict
 
 import yaml
 from packaging.requirements import Requirement
@@ -93,7 +94,7 @@ def check_no_symlinks() -> None:
 
 
 def check_versions() -> None:
-    versions = set()
+    versions = set[str]()
     with open("stdlib/VERSIONS", encoding="UTF-8") as f:
         data = f.read().splitlines()
     for line in data:
@@ -115,7 +116,7 @@ def check_versions() -> None:
 
 
 def _find_stdlib_modules() -> set[str]:
-    modules = set()
+    modules = set[str]()
     for path, _, files in os.walk("stdlib"):
         for filename in files:
             base_module = ".".join(os.path.normpath(path).split(os.sep)[1:])
@@ -140,11 +141,21 @@ def get_txt_requirements() -> dict[str, SpecifierSet]:
         return {requirement.name: requirement.specifier for requirement in requirements}
 
 
+class PreCommitConfigRepos(TypedDict):
+    hooks: list[dict[str, str]]
+    repo: str
+    rev: str
+
+
+class PreCommitConfig(TypedDict):
+    repos: list[PreCommitConfigRepos]
+
+
 def get_precommit_requirements() -> dict[str, SpecifierSet]:
     with open(".pre-commit-config.yaml", encoding="UTF-8") as precommit_file:
         precommit = precommit_file.read()
-    yam = yaml.load(precommit, Loader=yaml.Loader)
-    precommit_requirements = {}
+    yam: PreCommitConfig = yaml.load(precommit, Loader=yaml.Loader)
+    precommit_requirements: dict[str, SpecifierSet] = {}
     for repo in yam["repos"]:
         if not repo.get("python_requirement", True):
             continue

tests/check_new_syntax.py

@@ -9,7 +9,7 @@
 
 
 def check_new_syntax(tree: ast.AST, path: Path, stub: str) -> list[str]:
-    errors = []
+    errors: list[str] = []
 
     class IfFinder(ast.NodeVisitor):
         def visit_If(self, node: ast.If) -> None:
@@ -31,7 +31,7 @@ def visit_If(self, node: ast.If) -> None:
 
 
 def main() -> None:
-    errors = []
+    errors: list[str] = []
     for path in chain(Path("stdlib").rglob("*.pyi"), Path("stubs").rglob("*.pyi")):
         with open(path, encoding="UTF-8") as f:
             stub = f.read()

tests/mypy_test.py

@@ -42,7 +42,7 @@
 
 # Fail early if mypy isn't installed
 try:
-    import mypy  # noqa: F401
+    import mypy  # pyright: ignore[reportUnusedImport]  # noqa: F401
 except ImportError:
     print_error("Cannot import mypy. Did you install it?")
     sys.exit(1)
@@ -57,7 +57,8 @@
 Platform: TypeAlias = Annotated[str, "Must be one of the entries in SUPPORTED_PLATFORMS"]
 
 
-class CommandLineArgs(argparse.Namespace):
+@dataclass(init=False)
+class CommandLineArgs:
     verbose: int
     filter: list[Path]
     exclude: list[Path] | None
@@ -158,7 +159,7 @@ def match(path: Path, args: TestConfig) -> bool:
 
 
 def parse_versions(fname: StrPath) -> dict[str, tuple[VersionTuple, VersionTuple]]:
-    result = {}
+    result: dict[str, tuple[VersionTuple, VersionTuple]] = {}
     with open(fname, encoding="UTF-8") as f:
         for line in f:
             line = strip_comments(line)
@@ -209,7 +210,8 @@ def add_configuration(configurations: list[MypyDistConf], distribution: str) ->
     with Path("stubs", distribution, "METADATA.toml").open("rb") as f:
         data = tomli.load(f)
 
-    mypy_tests_conf = data.get("mypy-tests")
+    # TODO: This could be added to parse_metadata.py, but is currently unused
+    mypy_tests_conf: dict[str, dict[str, Any]] = data.get("mypy-tests", {})
     if not mypy_tests_conf:
         return
 
@@ -221,8 +223,8 @@ def add_configuration(configurations: list[MypyDistConf], distribution: str) ->
         assert module_name is not None, f"{section_name} should have a module_name key"
         assert isinstance(module_name, str), f"{section_name} should be a key-value pair"
 
-        values = mypy_section.get("values")
-        assert values is not None, f"{section_name} should have a values section"
+        assert "values" in mypy_section, f"{section_name} should have a values section"
+        values: dict[str, dict[str, Any]] = mypy_section["values"]
         assert isinstance(values, dict), "values should be a section"
 
         configurations.append(MypyDistConf(module_name, values.copy()))

tests/parse_metadata.py

@@ -1,3 +1,6 @@
+# This module is made specifically to abstract away those type errors
+# pyright: reportUnknownVariableType=false, reportUnknownArgumentType=false, reportUnknownMemberType=false
+
 """Tools to help parse and validate information stored in METADATA.toml files."""
 from __future__ import annotations
 
@@ -188,7 +191,8 @@ def read_metadata(distribution: str) -> StubMetadata:
     uploaded_to_pypi = data.get("upload", True)
     assert type(uploaded_to_pypi) is bool
 
-    tools_settings = data.get("tool", {})
+    empty_tools: dict[str, dict[str, object]] = {}
+    tools_settings = data.get("tool", empty_tools)
     assert isinstance(tools_settings, dict)
     assert tools_settings.keys() <= _KNOWN_METADATA_TOOL_FIELDS.keys(), f"Unrecognised tool for {distribution!r}"
     for tool, tk in _KNOWN_METADATA_TOOL_FIELDS.items():
@@ -234,7 +238,8 @@ def read_dependencies(distribution: str) -> PackageDependencies:
     If a typeshed stub is removed, this function will consider it to be an external dependency.
     """
     pypi_name_to_typeshed_name_mapping = get_pypi_name_to_typeshed_name_mapping()
-    typeshed, external = [], []
+    typeshed: list[str] = []
+    external: list[str] = []
     for dependency in read_metadata(distribution).requires:
         maybe_typeshed_dependency = Requirement(dependency).name
         if maybe_typeshed_dependency in pypi_name_to_typeshed_name_mapping:

tests/pytype_test.py

@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+# Lack of pytype typing
+# pyright: reportUnknownVariableType=false, reportUnknownMemberType=false, reportUnknownArgumentType=false, reportMissingTypeStubs=false
 """Test runner for typeshed.
 
 Depends on pytype being installed.
@@ -19,11 +21,14 @@
 from collections.abc import Iterable, Sequence
 
 import pkg_resources
-from pytype import config as pytype_config, load_pytd  # type: ignore[import]
-from pytype.imports import typeshed  # type: ignore[import]
 
 from parse_metadata import read_dependencies
 
+assert sys.platform != "win32"
+# pytype is not py.typed https://github.com/google/pytype/issues/1325
+from pytype import config as pytype_config, load_pytd  # type: ignore[import]  # noqa: E402
+from pytype.imports import typeshed  # type: ignore[import]  # noqa: E402
+
 TYPESHED_SUBDIRS = ["stdlib", "stubs"]
 TYPESHED_HOME = "TYPESHED_HOME"
 _LOADERS = {}
@@ -155,7 +160,11 @@ def get_missing_modules(files_to_test: Sequence[str]) -> Iterable[str]:
     for distribution in stub_distributions:
         for pkg in read_dependencies(distribution).external_pkgs:
             # See https://stackoverflow.com/a/54853084
-            top_level_file = os.path.join(pkg_resources.get_distribution(pkg).egg_info, "top_level.txt")  # type: ignore[attr-defined]
+            top_level_file = os.path.join(
+                # Fixed in #9747
+                pkg_resources.get_distribution(pkg).egg_info,  # type: ignore[attr-defined]  # pyright: ignore[reportGeneralTypeIssues]
+                "top_level.txt",
+            )
             with open(top_level_file) as f:
                 missing_modules.update(f.read().splitlines())
     return missing_modules

tests/typecheck_typeshed.py

@@ -15,11 +15,12 @@
 SUPPORTED_PLATFORMS = ("linux", "darwin", "win32")
 SUPPORTED_VERSIONS = ("3.11", "3.10", "3.9")
 DIRECTORIES_TO_TEST = ("scripts", "tests")
+EMPTY: list[str] = []
 
 parser = argparse.ArgumentParser(description="Run mypy on typeshed's own code in the `scripts` and `tests` directories.")
 parser.add_argument(
     "dir",
-    choices=DIRECTORIES_TO_TEST + ([],),
+    choices=DIRECTORIES_TO_TEST + (EMPTY,),
     nargs="*",
     action="extend",
     help=f"Test only these top-level typeshed directories (defaults to {DIRECTORIES_TO_TEST!r})",

tests/utils.py

@@ -135,4 +135,6 @@ def spec_matches_path(spec: pathspec.PathSpec, path: Path) -> bool:
     normalized_path = path.as_posix()
     if path.is_dir():
         normalized_path += "/"
-    return spec.match_file(normalized_path)
+    # pathspec.PathSpec.match_file has partially Unknown file parameter
+    # https://github.com/cpburnz/python-pathspec/pull/75
+    return spec.match_file(normalized_path)  # pyright: ignore[reportUnknownMemberType]