/**
 * @module
 * Encode utility.
 */
export declare const decodeBase64Url: (str: string) => Uint8Array<ArrayBuffer>;
export declare const encodeBase64Url: (buf: ArrayBufferLike) => string;
export declare const encodeBase64: (buf: ArrayBufferLike) => string;
export declare const decodeBase64: (str: string) => Uint8Array<ArrayBuffer>;