import { NilRule } from './nil/nil-types';
import { Guard } from '../core/guard';
import { GuardResult } from '../core/guard-result';
export declare class NilGuard extends Guard<NilRule> {
    constructor();
    /**
     * Checks if value is undefined or null.
     * @remarks Chainable method.
     */
    isNil(): this;
    /**
     * Checks if value is neither undefined nor null.
     * @remarks Chainable method.
     */
    isNotNil(): this;
    /**
     * Checks if value is not null.
     * @remarks Chainable method.
     */
    isNotNull(): this;
    /**
     * Checks if value is not undefined.
     * @remarks Chainable method.
     */
    isNotUndefined(): this;
    /**
     * Checks if value is null.
     * @remarks Chainable method.
     */
    isNull(): this;
    /**
     * Checks if value is undefined.
     * @remarks Chainable method.
     */
    isUndefined(): this;
    /**
     * @override
     * @param rule
     * @param value
     */
    protected checkRule(rule: NilRule, value: unknown): GuardResult;
    /**
     * @override
     */
    protected typeGuard(): void;
}