export async function ensureServiceWorker(): Promise<ServiceWorkerRegistration> {
  const registration = await navigator.serviceWorker.register("/sw.js", { updateViaCache: "none" });
  // ready can otherwise remain pending forever after an install failure.
  return new Promise((resolve, reject) => {
    const timeout = setTimeout(() => reject(new Error("The notification worker did not become ready. Reload and try again.")), 15000);
    void navigator.serviceWorker.ready.then(ready => { clearTimeout(timeout); resolve(ready); }, () => {
      clearTimeout(timeout); reject(new Error("The notification worker is unavailable."));
    });
    void registration.update().catch(() => undefined);
  });
}

export function registerServiceWorker() {
  if (!import.meta.env.PROD || !("serviceWorker" in navigator)) return;

  window.addEventListener("load", () => {
    void ensureServiceWorker().catch(() => undefined);
  });
}