22.2.0

Bugfixes:

• fix bugs in several error codes so that e.g. _T = typing.TypeVar("_T") is
  recognised as a TypeVar definition (previously only _T = TypeVar("_T") was
  recognised).
• fix bug where foo = False at the module level did not trigger a Y015 error.
• fix bug where TypeVars were erroneously flagged as unused if they were only used in
  a typing.Union subscript.
• improve unclear error messages for Y022, Y023 and Y027 error codes.

Features:

• introduce Y032 (prefer object to Any for the second argument in __eq__ and
  __ne__ methods).
• introduce Y033 (always use annotations in stubs, rather than type comments).
• introduce Y034 (detect common errors where return types are hardcoded, but they
  should use TypeVars instead).
• introduce Y035 (__all__ in a stub has the same semantics as at runtime).

22.1.0

• extend Y001 to cover ParamSpec and TypeVarTuple in addition to TypeVar
• detect usage of non-integer indices in sys.version_info checks
• extend Y010 to check async functions in addition to normal functions
• extend Y010 to cover what was previously included in Y090 (disallow
  assignments in __init__ methods) and Y091 (disallow raise
  statements). The previous checks were disabled by default.
• introduce Y016 (duplicate union member)
• introduce Y017 (disallows assignments with multiple targets or non-name targets)
• introduce Y018 (detect unused TypeVars)
• introduce Y019 (detect TypeVars that should be _typeshed.Self, but aren't)
• introduce Y020 (never use quoted annotations in stubs)
• introduce Y021 (docstrings should not be included in stubs)
• introduce Y022 (prefer stdlib classes over typing aliases)
• introduce Y023 (prefer typing over typing_extensions)
• introduce Y024 (prefer typing.NamedTuple to collections.namedtuple)
• introduce Y026 (require using TypeAlias for type aliases)
• introduce Y025 (always alias collections.abc.Set)
• introduce Y027 (Python 2-incompatible extension of Y022)
• introduce Y028 (Use class-based syntax for NamedTuples)
• introduce Y029 (never define __repr__ or __str__)
• introduce Y030 (use Literal['foo', 'bar'] instead of Literal['foo'] | Literal['bar'])
• introduce Y031 (use class-based syntax for TypedDicts where possible)
• all errors are now enabled by default
• remove Y092 (top-level attribute must not have a default value)
• attrs is no longer a dependency
• ast_decompiler has been added as a dependency on Python 3.8 and 3.7
• support Python 3.10
• discontinue support for Python 3.6

22.1.0rc1

Pre-release. If all goes well 22.1.0 will follow soon with the exact same code.

• extend Y001 to cover ParamSpec and TypeVarTuple in addition to TypeVar
• detect usage of non-integer indices in sys.version_info checks
• extend Y010 to check async functions in addition to normal functions
• extend Y010 to cover what was previously included in Y090 (disallow
  assignments in __init__ methods) and Y091 (disallow raise
  statements). The previous checks were disabled by default.
• introduce Y016 (duplicate union member)
• introduce Y017 (disallows assignments with multiple targets or non-name targets)
• introduce Y018 (detect unused TypeVars)
• introduce Y019 (detect TypeVars that should be _typeshed.Self, but aren't)
• introduce Y020 (never use quoted annotations in stubs)
• introduce Y021 (docstrings should not be included in stubs)
• introduce Y022 (prefer stdlib classes over typing aliases)
• introduce Y023 (prefer typing over typing_extensions)
• introduce Y024 (prefer typing.NamedTuple to collections.namedtuple)
• introduce Y026 (require using TypeAlias for type aliases)
• introduce Y025 (always alias collections.abc.Set)
• introduce Y027 (Python 2-incompatible extension of Y022)
• introduce Y028 (Use class-based syntax for NamedTuples)
• introduce Y029 (never define __repr__ or __str__)
• introduce Y030 (use Literal['foo', 'bar'] instead of Literal['foo'] | Literal['bar'])
• introduce Y031 (use class-based syntax for TypedDicts where possible)
• all errors are now enabled by default
• remove Y092 (top-level attribute must not have a default value)
• attrs is no longer a dependency
• ast_decompiler has been added as a dependency on Python 3.8 and 3.7
• support Python 3.10
• discontinue support for Python 3.6