prefer-negative-index

Prefer negative indices in equivalent at calls

array.at(array.length as isize - offset) performs the same lookup as array.at(-offset) for a positive constant offset.
Instead, you SHOULD pass the negative offset directly.

- Category: style
- Level: warning
- Fix: automatic
- Scope: module

Reported

function penultimate(values: int32[]): int32 | undefined {
    return values.at((values.length as isize) - 2);
}
Accepted

function penultimate(values: int32[]): int32 | undefined {
    return values.at(-2);
}
Prior art

- eslint-plugin-unicorn · prefer-negative-index

language/linter/src/rules/style/prefernegativeindex.rs:8