/**
 * **Standard :** RFC 4648
 *
 * @see https://datatracker.ietf.org/doc/html/rfc4648#section-4
 *
 * @version 1.0.0
 */
export declare function isBase64(str: string, params?: undefined): boolean;
/**
 * **Standard :** RFC 4648
 *
 * @see https://datatracker.ietf.org/doc/html/rfc4648#section-5
 *
 * @version 1.0.0
 */
export declare function isBase64Url(str: string, params?: undefined): boolean;
/**
 * **Standard :** RFC 4648
 *
 * @see https://datatracker.ietf.org/doc/html/rfc4648#section-6
 *
 * @version 1.0.0
 */
export declare function isBase32(str: string, params?: undefined): boolean;
/**
 * **Standard :** RFC 4648
 *
 * @see https://datatracker.ietf.org/doc/html/rfc4648#section-7
 *
 * @version 1.0.0
 */
export declare function isBase32Hex(str: string, params?: undefined): boolean;
/**
 * **Standard :** RFC 4648
 *
 * @see https://datatracker.ietf.org/doc/html/rfc4648#section-8
 *
 * @version 1.0.0
 */
export declare function isBase16(str: string, params?: undefined): boolean;