/**
 * Given a JSON-serializable object, encode as a Base64 string.
 */
export declare function encodeJSON<T>(options: T): string;
/**
 * Given a Base64 JSON string, decode a JavaScript object.
 */
export declare function decodeJSON<T>(queryString: string): T;
/**
 * Encode given buffer or decode given string with Base64URL.
 */
export declare class Base64URL {
    /**
     * Convert bytes into a base64url-encoded string
     */
    static encode(buffer: ArrayBuffer): string;
    /**
     * Convert a base64url-encoded string into bytes
     */
    static decode(base64url: string): ArrayBuffer;
}