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unused-private-type-alias (PYI047)#

Derived from the flake8-pyi linter.

What it does#

Checks for the presence of unused private typing.TypeAlias definitions.

Why is this bad?#

A private typing.TypeAlias that is defined but not used is likely a mistake, and should either be used, made public, or removed to avoid confusion.

Example#

import typing

_UnusedTypeAlias: typing.TypeAlias = int

Use instead: 

import typing

_UsedTypeAlias: typing.TypeAlias = int


def func(arg: _UsedTypeAlias) -> _UsedTypeAlias:
    ...