Service Worker for Web Push API

service-worker.js

self.addEventListener('push', (ev) => {
  // https://developer.apple.com/documentation/usernotifications/sending_web_push_notifications_in_safari_and_other_browsers
  // >> Safari doesn’t support invisible push notifications.
  // >> Present push notifications to the user immediately after your service worker receives them.
  // >> If you don’t, Safari revokes the push notification permission for your site.
  ev.waitUntil(
    self.registration.showNotification('Push Message', {
      body: ev.data?.text() ?? 'no data'
    })
  );
});