thebespokepixel/n-selector

/* ───────────╮
 │ n-selector │
 ╰────────────┴──────────────────────────────────────────────────────────────── */
/* eslint no-bitwise: 0 */

import {randomBytes} from 'node:crypto'

/**
 * Calculate a valid RFC4122 UUID
 * @function
 * @private
 * @param  {String} a Recursive parameter used to build UUID.
 * @return {String}   Resultant UUID
 * @example
 * import uuid from './uuid'
 * const UUID = uuid()
 */
const uuid = a => a
    ? ((a ^    randomBytes(1)[0] % 16) >> a / 4).toString(16)
    : ([1e7] +    -1e3 + -4e3 + -8e3 +    -1e11).replace(/[018]/g, uuid)

export default uuid