/**
 * Universal base64 utilities that work in both Node and Edge runtimes
 */
/**
 * Encode a Uint8Array to base64 string
 */
export declare function encodeBase64(data: Uint8Array): string;
/**
 * Decode a base64 string to Uint8Array
 */
export declare function decodeBase64(base64: string): Uint8Array;