@ungap/random-uuid/index.js

A crypto.randomUUID polyfill

if (typeof crypto === 'undefined')
  var crypto = require('crypto');

if (!('randomUUID' in crypto))
  // https://stackoverflow.com/a/2117523/2800218
  // LICENSE: https://creativecommons.org/licenses/by-sa/4.0/legalcode
  crypto.randomUUID = function randomUUID() {
    return (
      [1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g,
      c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
    );
  };