The networkIdleCallback can only be achieved through "sw"?

[imtaotao]

I found a new api PerformanceObserver, it support fetchEnd event, maybe we can achieve it by a new method？

const observer = new PerformanceObserver((list, observer) => {
  console.log(list.getEntries());
});
observer.observe({ entryTypes: ['resource'] });

[pastelsky]

@imtaotao I did not find documentation for fetchEnd that you mention. Could you elaborate more?
I'd love to remove the requirement for service workers here, if possible.