/**
 * Universal random bytes implementation
 * Uses Web Crypto API in browser, Node.js crypto in Node.js
 */
/**
 * Get random bytes using the best available method for the environment
 * In browser: uses Web Crypto API (crypto.getRandomValues)
 * In Node.js: uses Node.js crypto.randomBytes
 * @param size Number of bytes to generate
 * @returns Buffer with random bytes
 */
export declare function randomBytes(size: number): Buffer;