self.addEventListener('install', (event) => {
  console.log('👷', 'install', event);
  self.skipWaiting();
});
 
self.addEventListener('activate', (event) => {
  console.log('👷', 'activate', event);
  return self.clients.claim();
});
 
/*
self.addEventListener('fetch', function(event) {
  // console.log('👷', 'fetch', event);
  event.respondWith(fetch(event.request));
});
*/
 
self.addEventListener('fetch', event => {
  console.log('👷', 'fetch', event);
  const url = new URL(event.request.url);
  // If this is an incoming POST request for the
  // registered "action" URL, respond to it.
  if (event.request.method === 'POST' &&
      url.pathname === 'share.php') {
 
    event.respondWith((async () => {
      const formData = await event.request.formData();
      const link = formData.get('link') || '';
      const responseUrl = await saveBookmark(link);
      return Response.redirect(responseUrl, 303);
    })());
  }
});