/**
 * Generates a UUID v7 (Universally Unique Identifier version 7)
 * @returns {string} A UUID v7 string in the format xxxxxxxx-xxxx-7xxx-8xxx-xxxxxxxxxxxx
 * @example
 * const id = uuidv7(); // e.g. "018d6e78-e1e5-7c3c-8bf9-ae5942f2ba1c"
 * @description
 * UUID v7 is time-ordered and contains:
 * - 48 bits of Unix timestamp in milliseconds
 * - 74 bits of random data
 * - 4 bits of version (7)
 * - 2 bits of variant (2)
 * This implementation follows the UUID v7 draft specification.
 */
export declare const uuidv7: () => string;