/**
 * Generates a random UUID v4 (universally unique identifier).
 *
 * @returns A random UUID v4 string in the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
 *
 * @example
 * randomUUID(); // '550e8400-e29b-41d4-a716-446655440000'
 *
 * @example
 * // Generate multiple UUIDs
 * const ids = Array.from({ length: 5 }, () => randomUUID());
 *
 * @note Uses Math.random() for generation (NOT cryptographically secure).
 *
 * @deprecated Use `crypto.randomUUID()` (Node.js 14.17+) or `generateRandomBytes` from
 * `@ts-utilkit/crypto` for cryptographically secure UUIDs. This function uses `Math.random()`
 * which is predictable and unsuitable for security-sensitive identifiers.
 * Will be removed in the next major version.
 *
 * @complexity Time: O(1), Space: O(1)
 */
export declare function randomUUID(): string;
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