22.8.2

New error codes:

• Y047: Detect unused TypeAlias declarations.
• Y049: Detect unused TypedDict definitions.
• Y050: Prefer typing_extensions.Never for argument annotations over
  typing.NoReturn.
• Y051: Detect redundant unions between Literal types and builtin supertypes
  (e.g. Literal["foo"] | str, or Literal[5] | int).

Other enhancements:

• Support mypy_extensions.TypedDict.

22.8.1

• Add support for flake8 >= 5.0.0.

22.8.0

New error codes:

• Y046: Detect unused Protocols.
• Y048: Function bodies should contain exactly one statement.

Bugfixes:

• Improve error message for the case where a function body contains a docstring
  and a ... or pass statement.

Other changes:

• Pin required flake8 version to <5.0.0 (flake8-pyi is not currently compatible with flake8 5.0.0).

22.7.0

New error codes:

• Introduce Y041: Ban redundant numeric unions (int | float, int | complex,
  float | complex).
• Introduce Y042: Type alias names should use CamelCase rather than snake_case
• Introduce Y043: Ban type aliases from having names ending with an uppercase "T".
• Introduce Y044: Discourage unnecessary from __future__ import annotations import.
  Contributed by Torsten Wörtwein.
• Introduce Y045: Ban returning (Async)Iterable from __(a)iter__ methods.

Other enhancements and behaviour changes:

• Improve error message for Y026 check.
• Expand Y026 check. Since version 22.4.0, this has only emitted an error for
  assignments to typing.Literal, typing.Union, and PEP 604 unions. It now also
  emits an error for any subscription on the right-hand side of a simple assignment, as
  well as for assignments to typing.Any and None.
• Support typing_extensions.overload and typing_extensions.NamedTuple.
• Slightly expand Y034 to cover the case where a class inheriting from (Async)Iterator
  returns (Async)Iterable from __(a)iter__. These classes should nearly always return
  Self from these methods.
• Support Python 3.11.

22.5.1

Behaviour changes:

• Relax Y020 check slightly, enabling the idiom __all__ += ["foo", "bar"] to be used
  in a stub file.

22.5.0

Features:

• Introduce Y039: Use str instead of typing.Text for Python 3 stubs.
• Teach the Y036 check that builtins.object (as well as the unqualified object) is acceptable as an annotation for an __(a)exit__ method argument.
• Teach the Y029 check to emit errors for __repr__ and __str__ methods that return builtins.str (as opposed to the unqualified str).
• Introduce Y040: Never explicitly inherit from object in Python 3 stubs.

22.4.1

Features:

• Expand Y027 check to prohibit importing any objects from the typing module that are aliases for objects living in collections.abc (except for typing.AbstractSet, which is special-cased).
• Introduce Y038: Use from collections.abc import Set as AbstractSet instead of from typing import AbstractSet.

Bugfixes:

• Improve inaccurate error messages for Y036.

22.4.0

Features:

• Introduce Y036 (check for badly defined __exit__ and __aexit__ methods).
• Introduce Y037 (Use PEP 604 syntax instead of typing.Union and typing.Optional).
  Contributed by Oleg Höfling.

Behaviour changes:

• Expand Y035 to cover __match_args__ inside class definitions, as well as __all__
  in the global scope.

Bugfixes:

• Improve Y026 check (regarding typing.TypeAlias) to reduce false-positive errors
  emitted when the plugin encountered variable aliases in a stub file.

22.3.0

Bugfixes:

• fix bug where incorrect quoted annotations were not detected within if blocks

Behaviour changes:

• Add special-casing so that string literals are allowed in the context of __match_args__ assignments inside a class definition.
• Add special-casing so that arbitrary values can be assigned to a variable in a stub file if the variable is annotated with Final.

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).