sw-push.js

self.addEventListener("push", (event) => {
  if (event.data) {
    try {
      data = JSON.parse(event.data.text());
      event.waitUntil(
        self.registration.showNotification(data.title, {
          body: data.content,
          icon: "/icon-192.png",
          badge: "/badge-192.png",
        })
      );
    } catch (e) {
      console.error('push event data parse fail');
    }
  }
});