BlueJeansParticipants.js

// it notifies about the highest peak, and it logs it in console
// it also saves it to the window.participants property
(function () {
  var max = 0;
  var timer = 0;
  var target = document.querySelector('[type="participants"]');
  var Notification = self.Notification || {permission: 'denied'};
  (new MutationObserver(() => {
    var now = Math.max(parseInt(target.innerText.trim()), max);
    if (max < now) {
      console.log('%cparticipants:', 'font-weight:bold', max = now);
      if (Notification.permission === 'granted')
        notify();
      else if (Notification.permission !== 'denied') {
        Notification.requestPermission().then(function (permission) {
          if (permission === "granted")
            notify();
        });
      }
      window.participants = max;
    }
  })).observe(target, {characterData: true, subtree: true});
  function notify() {
    clearTimeout(timer);
    timer = setTimeout(
      function () {
        new Notification('new participants peek: ' + max);
      },
      5000
    );
  }
}());