/**
 * Base64 helpers — Node.js (Buffer) with browser fallback (btoa/atob).
 */
/**
 * Encodes a UTF-8 string or raw bytes to a base64 string.
 */
export declare function toBase64(input: string | Uint8Array): string;
/**
 * Decodes a base64 string to a Uint8Array.
 */
export declare function fromBase64ToUint8Array(b64: string): Uint8Array;
/**
 * Decodes a base64 string interpreted as UTF-8 text.
 */
export declare function fromBase64ToUtf8(b64: string): string;
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