negative<T extends num, E> static method

Rule<T, E> negative<T extends num, E>({ required E error, })

Validates that the number is negative (< 0).

NumberRules.negative(error: 'Must be negative')

Implementation

static Rule<T, E> negative<T extends num, E>({required E error}) =>
    PredicateRule(predicate: (value) => value < 0, error: error);