[258059] <script type="text/javascript"> const check = () => { if (!('serviceWorker' in navigator)...

<script type="text/javascript">
  const check = () => {
    if (!('serviceWorker' in navigator)) {
      throw new Error('No Service Worker support!')
    }
    if (!('PushManager' in window)) {
      throw new Error('No Push API Support!')
    }
  };
  
  const registerServiceWorker = async () => {
    const swRegistration = await navigator.serviceWorker.register('/text/258050?ct=text/javascript');
    return swRegistration;
  };
  
  const main = async () => {
    check();
    const swRegistration = await registerServiceWorker();
  };

  main();
</script>