no-negation-in-equality-check

Disallow negation in equality checks

!left === right negates only the left operand, although its visual shape can be read as negating the complete equality check.
Instead, you SHOULD parenthesize the intended grouping or use the opposite equality operator.

- Category: suspicious
- Level: warning
- Fix: suggestion
- Scope: module

Reported

function differs(left: boolean, right: boolean): boolean {
    return !left === right;
}
Accepted

function differs(left: boolean, right: boolean): boolean {
    return !(left === right);
}
Prior art

- eslint-plugin-unicorn · no-negation-in-equality-check

language/linter/src/rules/suspicious/nonegationinequalitycheck.rs:7