no-negated-float-comparison

Disallow negated floating-point ordering comparisons that accept NaN

correctnesswarningno fixmodule

!(left < right) evaluates to true when either operand is NaN because every ordering comparison with NaN evaluates to false. Instead, you SHOULD handle NaN explicitly and write the intended positive comparison, such as !left.isNaN() && !right.isNaN() && left >= right.

Reported

1function isAtLeast(left: float64, right: float64): boolean {2    return !(left < right);3}

Accepted

1function isAtLeast(left: float64, right: float64): boolean {2    return !left.isNaN() && !right.isNaN() && left >= right;3}