Strict types

pyproject.toml

@@ -63,8 +63,24 @@ Home = "https://fixit.rtfd.io"
 Github = "https://github.com/Instagram/Fixit"
 Changelog = "https://github.com/Instagram/Fixit/blob/main/CHANGELOG.md"
 
+[tool.attribution]
+name = "Fixit"
+package = "fixit"
+signed_tags = true
+version_file = false
+ignored_authors = ["dependabot"]
+
 [tool.black]
-target-version = ["py37"]
+target-version = ["py38"]
+
+[tool.fixit]
+enable = ["fixit.rules"]
+python-version = "3.10"
+formatter = "ufmt"
+
+[[tool.fixit.overrides]]
+path = "examples"
+enable = [".examples.noop"]
 
 [tool.hatch.version]
 source = "vcs"
@@ -109,18 +125,7 @@ build = [
     "sphinx-build -a -b html docs html",
 ]
 
-[tool.fixit]
-enable = ["fixit.rules"]
-python-version = "3.10"
-formatter = "ufmt"
-
-[[tool.fixit.overrides]]
-path = "examples"
-enable = [".examples.noop"]
-
-[tool.attribution]
-name = "Fixit"
-package = "fixit"
-signed_tags = true
-version_file = false
-ignored_authors = ["dependabot"]
+[tool.mypy]
+strict = true
+python_version = "3.8"
+ignore_missing_imports = true

src/fixit/cli.py

@@ -78,7 +78,7 @@ def main(
     config_file: Optional[Path],
     tags: str,
     rules: str,
-):
+) -> None:
     level = logging.WARNING
     if debug is not None:
         level = logging.DEBUG if debug else logging.ERROR
@@ -106,7 +106,7 @@ def lint(
     ctx: click.Context,
     diff: bool,
     paths: Sequence[Path],
-):
+) -> None:
     """
     lint one or more paths and return suggestions
 
@@ -153,7 +153,7 @@ def fix(
     interactive: bool,
     diff: bool,
     paths: Sequence[Path],
-):
+) -> None:
     """
     lint and autofix one or more files and return results
 
@@ -206,7 +206,7 @@ def fix(
 @main.command()
 @click.pass_context
 @click.argument("rules", nargs=-1, required=True, type=str)
-def test(ctx: click.Context, rules: Sequence[str]):
+def test(ctx: click.Context, rules: Sequence[str]) -> None:
     """
     test lint rules and their VALID/INVALID cases
     """
@@ -230,7 +230,7 @@ def test(ctx: click.Context, rules: Sequence[str]):
 @main.command()
 @click.pass_context
 @click.argument("paths", nargs=-1, type=click.Path(path_type=Path))
-def upgrade(ctx: click.Context, paths: Sequence[Path]):
+def upgrade(ctx: click.Context, paths: Sequence[Path]) -> None:
     """
     upgrade lint rules and apply deprecation fixes
 
@@ -245,7 +245,7 @@ def upgrade(ctx: click.Context, paths: Sequence[Path]):
 @main.command()
 @click.pass_context
 @click.argument("paths", nargs=-1, type=click.Path(exists=True, path_type=Path))
-def debug(ctx: click.Context, paths: Sequence[Path]):
+def debug(ctx: click.Context, paths: Sequence[Path]) -> None:
     """
     print materialized configuration for paths
     """

src/fixit/config.py

@@ -23,12 +23,12 @@
     Optional,
     Sequence,
     Set,
+    Tuple,
     Type,
     Union,
 )
 
 from packaging.specifiers import SpecifierSet
-
 from packaging.version import InvalidVersion, Version
 
 from .format import FORMAT_STYLES
@@ -69,7 +69,7 @@ def __init__(self, msg: str, rule: QualifiedRule):
         super().__init__(msg)
         self.rule = rule
 
-    def __reduce__(self):
+    def __reduce__(self) -> Tuple[Type[RuntimeError], Any]:
         return type(self), (*self.args, self.rule)
 
 
@@ -230,7 +230,7 @@ def collect_rules(
 
         if config.tags:
             disabled_rules.update(
-                {R: "tags" for R in all_rules if R.TAGS not in config.tags}
+                {R: "tags" for R in all_rules if R.TAGS not in config.tags}  # type: ignore[comparison-overlap]
             )
             all_rules -= set(disabled_rules)
 
@@ -314,6 +314,7 @@ def read_configs(paths: List[Path]) -> List[RawConfig]:
 def get_sequence(
     config: RawConfig, key: str, *, data: Optional[Dict[str, Any]] = None
 ) -> Sequence[str]:
+    value: Sequence[str]
     if data:
         value = data.pop(key, ())
     else:
@@ -400,7 +401,7 @@ def process_subpath(
         options: Optional[RuleOptionsTable] = None,
         python_version: Any = None,
         formatter: Optional[str] = None,
-    ):
+    ) -> None:
         nonlocal target_python_version
         nonlocal target_formatter
 

src/fixit/engine.py

@@ -127,7 +127,7 @@ def on_visit(self, node: CSTNode) -> bool:
                 # don't visit children if we're going to replace the parent anyways
                 return node not in replacements
 
-            def on_leave(self, node: CSTNode, updated: CSTNode) -> NodeReplacement:
+            def on_leave(self, node: CSTNode, updated: CSTNode) -> NodeReplacement:  # type: ignore[type-arg]
                 if node in replacements:
                     new = replacements[node]
                     return new

src/fixit/ftypes.py

@@ -27,9 +27,10 @@
 from libcst import CSTNode, CSTNodeT, FlattenSentinel, RemovalSentinel
 from libcst._add_slots import add_slots
 from libcst.metadata import CodePosition as CodePosition, CodeRange as CodeRange
-
 from packaging.version import Version
 
+__all__ = ("Version",)
+
 T = TypeVar("T")
 
 STDIN = Path("-")
@@ -48,9 +49,7 @@
 TimingsHook = Callable[[Timings], None]
 
 VisitorMethod = Callable[[CSTNode], None]
-VisitHook = Callable[[str], ContextManager]
-
-Version
+VisitHook = Callable[[str], ContextManager[None]]
 
 
 @dataclass(frozen=True)
@@ -212,7 +211,7 @@ class Config:
     # post-run processing
     formatter: Optional[str] = None
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         self.path = self.path.resolve()
         self.root = self.root.resolve()
 
@@ -222,7 +221,7 @@ class RawConfig:
     path: Path
     data: Dict[str, Any]
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         self.path = self.path.resolve()
 
 
@@ -237,7 +236,7 @@ class LintViolation:
     range: CodeRange
     message: str
     node: CSTNode
-    replacement: Optional[NodeReplacement]
+    replacement: Optional[NodeReplacement[CSTNode]]
     diff: str = ""
 
     @property

src/fixit/rule.py

@@ -190,7 +190,7 @@ def report(
         message: Optional[str] = None,
         *,
         position: Optional[Union[CodePosition, CodeRange]] = None,
-        replacement: Optional[NodeReplacement] = None,
+        replacement: Optional[NodeReplacement[CSTNode]] = None,
     ) -> None:
         """
         Report a lint rule violation.

src/fixit/rules/compare_singleton_primitives_by_is.py

@@ -3,7 +3,7 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-from typing import cast, FrozenSet, Union
+from typing import cast, FrozenSet, Set, Union
 
 import libcst as cst
 from libcst.metadata import QualifiedName, QualifiedNameProvider, QualifiedNameSource
@@ -78,9 +78,11 @@ class CompareSingletonPrimitivesByIs(LintRule):
         }
     )
 
-    def is_singleton(self, node: cst.BaseExpression):
-        qual_name = cast(set, self.get_metadata(QualifiedNameProvider, node, set()))
-        return (
+    def is_singleton(self, node: cst.BaseExpression) -> bool:
+        qual_name = cast(
+            Set[QualifiedName], self.get_metadata(QualifiedNameProvider, node, set())
+        )
+        return bool(
             isinstance(node, cst.Name)
             and qual_name
             and qual_name < self.QUALIFIED_SINGLETON_PRIMITIVES

src/fixit/rules/rewrite_to_comprehension.py

@@ -141,9 +141,7 @@ def visit_Call(self, node: cst.Call) -> None:
 
                 replacement = node.deep_replace(
                     node,
-                    # pyre-fixme[6]: Expected `BaseAssignTargetExpression` for 1st
-                    #  param but got `BaseExpression`.
-                    cst.DictComp(key=key, value=value, for_in=exp.for_in),  # type: ignore
+                    cst.DictComp(key=key, value=value, for_in=exp.for_in),
                 )
 
             self.report(

src/fixit/rules/use_async_sleep_in_async_def.py

@@ -112,7 +112,7 @@ async def func():
         ),
     ]
 
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         # is async func
         self.async_func = False

src/fixit/testing.py

@@ -11,8 +11,8 @@
 from typing import Any, Callable, Collection, Dict, List, Mapping, Sequence, Type, Union
 
 from .engine import diff_violation, LintRunner
-from .ftypes import Config
-from .rule import Invalid, LintRule, Valid
+from .ftypes import Config, Invalid, Valid
+from .rule import LintRule
 
 
 def _dedent(src: str) -> str:
@@ -30,7 +30,7 @@ def get_fixture_path(
 
 def validate_patch(report: Any, test_case: Invalid) -> None:
     patch = report.patch
-    expected_replacement = test_case.expected_replacement  # type: ignore
+    expected_replacement = test_case.expected_replacement
 
     if patch is None:
         if expected_replacement is not None:
@@ -168,7 +168,7 @@ def generate_lint_rule_test_cases(
     test_case_classes: List[Type[unittest.TestCase]] = []
     for test_case in gen_all_test_methods(rules):
         rule_name = type(test_case.rule).__name__
-        test_methods_to_add: Dict[str, Callable] = {}
+        test_methods_to_add: Dict[str, Callable[..., Any]] = {}
 
         for test_method_name, test_method_data in test_case.test_methods.items():
 

src/fixit/tests/__init__.py

@@ -3,8 +3,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-from fixit.config import collect_rules, Config
-from fixit.ftypes import QualifiedRule
+from fixit.config import collect_rules
+from fixit.ftypes import Config, QualifiedRule
 
 from fixit.testing import add_lint_rule_tests_to_module
 from .config import ConfigTest