ServiceWorker: error event

addEventListener("error", (event) => { })
onerror = (event) => { }

// in the page being controlled
if (navigator.serviceWorker) {
  navigator.serviceWorker.register("service-worker.js");
  navigator.serviceWorker.ready.then((registration) => {
    registration.active.onerror = (event) => {
      console.log("An error occurred in the service worker!");
    };
  });
}