/**
 * validates input contains only digits
 * @param {string} value
 * @returns {boolean}
 */
export declare const onlyDigitsValidator: (value: string) => boolean;
/**
 * validates value is of exact length and contains only digit
 * @param {string} value
 * @param {number} length
 * @returns
 */
export declare const idValidator: (value: string, length: number) => boolean;
/**
 * validates string format is YYYYMM
 * @param {string} value YYYYMM
 * @returns {boolean}
 */
export declare const yearMonthValidator: (value: string) => boolean;