discourse/app/assets/javascripts/pretty-text/guid.js

/*eslint no-bitwise:0 */

// http://stackoverflow.com/a/8809472/17174
export default function() {
  let d = new Date().getTime();
  if (window.performance && typeof window.performance.now === "function") {
    d += performance.now(); //use high-precision timer if available
  }
  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function(c) {
    const r = (d + Math.random() * 16) % 16 | 0;
    d = Math.floor(d / 16);
    return (c === "x" ? r : (r & 0x3) | 0x8).toString(16);
  });
}