/**
 * Copyright 2004-present Facebook. All Rights Reserved.
 *
 * @typechecks
 * @flow strict
 * @format
 */

/*eslint-disable no-bitwise */

/**
 * Based on the rfc4122-compliant solution posted at
 * http://stackoverflow.com/questions/105034
 */
function uuid(): string {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => {
    const r = Math.random() * 16 | 0;
    const v = c == 'x' ? r : r & 0x3 | 0x8;
    return v.toString(16);
  });
}

module.exports = uuid;