Richard Oddo

Mình đã xử lý được theo cách sau:

self.addEventListener('push', function(event) {
  var data = event.data.json();

  event.waitUntil(
    self.registration.showNotification(data.notification.title, {
      body: data.notification.body,
      icon: data.notification.icon,
      requireInteraction: true,
      data: {
        url: data.notification.click_action
      }
    })
  );
}); 

self.addEventListener('notificationclick', function(event) {
    event.notification.close();
    var url = event.notification.data.url;
    console.log(url, event.notification.data);
    event.waitUntil(
        clients.matchAll({
                type: 'window'
            })
            .then(function(windowClients) {
                for (var i = 0; i < windowClients.length; i++) {
                    var client = windowClients[i];
                    if (client.url === url && 'focus' in client) {
                        return client.focus();
                    }
                }
                if (clients.openWindow) {
                    return clients.openWindow(url);
                }
            })
    );
});