owtlab-tracking/lib/helpers/getUniqueId.js

A simple Tracking system

export function getUniqueId() {
  // uuidv4
  if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
    // browser
    return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
      (
        c ^
        (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
      ).toString(16));
  }
  // node & older browsers
  const str = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
  return str.replace(/[xy]/g, (c) => {
    const r = (Math.random() * 16) | 0;
    const v = c == 'x' ? r : (r & 0x3) | 0x8;
    return v.toString(16);
  });
}