ServiceWorkerRegistration: updatefound event

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨April 2018⁩.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The updatefound event of the ServiceWorkerRegistration interface is fired any time the ServiceWorkerRegistration.installing property acquires a new service worker.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("updatefound", (event) => { })
onupdatefound = (event) => { }

Event type

A generic Event.

Examples

const registration = await navigator.serviceWorker.getRegistration();
if (registration) {
 registration.addEventListener("updatefound", () => {
 console.log("Service Worker update found!");
 });
}