import { StringRuleChecker } from './string-rule-checker';
import { GuardResult } from '../../core/guard-result';
/**
 * ObjectId pattern:
 * - 24 hex digits.
 * - Not case sensitive.
 */
export declare const OBJECT_ID_PATTERN = "^[a-fA-F\\d]{24}$";
export declare class StringIsObjectId extends StringRuleChecker<{
    type: 'isObjectId';
}> {
    constructor(rule: {
        type: 'isObjectId';
    }, value: string);
    /**
     * @override
     */
    exec(): GuardResult;
    private isObjectId;
}