/**
 * Simple base64url encoding utility using core base64 functions
 */
/**
 * Converts a string to base64url encoding
 * @param str - The string to encode
 * @returns The base64url encoded string
 */
export declare function base64urlEncode(str: string): string;
/**
 * Converts an object to a base64url encoded JSON string
 * @param obj - The object to encode
 * @returns The base64url encoded JSON string
 */
export declare function base64urlEncodeJson(obj: unknown): string;