chat.component.ts

notifyMessage(message: Message):void {
  // don't notify the user of messages they sent
  // and only show a notification if the application
  // isn't visible (IE: it is minimized)
  if( message.author === this.currentUsername || !this.showDesktopNotification ) {
    return;
  }
  const notification = {
    title: `TWACK Message from ${message.author}`,
    body: message.body
  }
  const desktopNotification = new Notification(notification.title, notification);

  // the following click handler is not fired
  // in Debian 9 running KDE (seems to be an OS bug)
  // but tested and works in macOS High Sierra
  desktopNotification.onclick = () => {
    const win = window.require('electron').remote.getCurrentWindow();
    win.restore();
  };
}