error

What it does

Checks for ty: ignore comments that don't specify which rules to ignore.

Why is this bad?

A blanket ty: ignore comment suppresses every type-checking diagnostic on the applicable line or file. Specifying rule codes documents which diagnostics are expected and prevents the comment from silencing unrelated errors.

Examples

# error
value = unknown  # ty: ignore

Use instead:

value = unknown  # ty: ignore[unresolved-reference]