import { NumberRuleChecker } from './number-rule-checker';
import { GuardResult } from '../../core/guard-result';
export declare class NumberIsNegative extends NumberRuleChecker<{
    type: 'isNegative';
}> {
    constructor(rule: {
        type: 'isNegative';
    }, value: number);
    /**
     * @override
     */
    exec(): GuardResult;
    private isNegative;
}