Migrate type checking from mypy to ty

Author: gaborbernat

pyproject.toml

@@ -124,7 +124,5 @@ report.fail_under = 76
 html.show_contexts = true
 html.skip_covered = false
 
-[tool.mypy]
-python_version = "3.12"
-show_error_codes = true
-strict = true
+[tool.ty]
+environment.python-version = "3.14"

src/sphinx_argparse_cli/_logic.py

@@ -120,7 +120,7 @@ def parser(self) -> ArgumentParser:
                 except HookError as hooked:
                     self._parser = hooked.parser
                 finally:
-                    ArgumentParser.parse_known_args = original_parse_known_args  # type: ignore[method-assign]
+                    ArgumentParser.parse_known_args = original_parse_known_args
             else:
                 self._parser = parser_creator()
 
@@ -158,8 +158,7 @@ def _load_sub_parsers(
 
             # If this parser has a subparser, recurse into it
             if parser._subparsers:  # noqa: SLF001
-                sub_sub_parser: _SubParsersAction[ArgumentParser]
-                sub_sub_parser = parser._subparsers._group_actions[0]  # type: ignore[assignment]  # noqa: SLF001
+                sub_sub_parser: _SubParsersAction[ArgumentParser] = parser._subparsers._group_actions[0]  # type: ignore[assignment]  # noqa: SLF001
                 yield from self._load_sub_parsers(sub_sub_parser)
 
     def load_sub_parsers(self) -> Iterator[tuple[list[str], str, ArgumentParser]]:

tox.toml

@@ -53,8 +53,8 @@ commands = [
 
 [env.type]
 description = "run type check on code base"
-deps = [ "mypy==1.19", "types-docutils>=0.22.3.20251115" ]
-commands = [ [ "mypy", "src", "tests", { replace = "posargs", extend = true } ] ]
+deps = [ "ty>=0.0.17" ]
+commands = [ [ "ty", "check", "--output-format", "concise", "--error-on-warning", "." ] ]
 
 [env.dev]
 description = "generate a DEV environment"