API

async function syncMessagesLater() {
  const registration = await navigator.serviceWorker.ready;
  try {
    await registration.sync.register("sync-messages");
  } catch {
    console.log("");
  }
}

navigator.serviceWorker.ready.then((registration) => {
  registration.sync.getTags().then((tags) => {
    if (tags.includes("sync-messages")) {
      console.log("");
    }
  });
});

self.addEventListener("sync", (event) => {
  if (event.tag === "sync-messages") {
    event.waitUntil(sendOutboxMessages());
  }
});