Background sync help

[Credwa]

How do I add background sync to my PWA?

I already wrote the function:
self.addEventListener(“sync”, function(event) {
console.log(“background syncing”, event);
if (event.tag === “sync-new-message”) {
console.log(“syncing new messages”);
}
});

But when I build with: quasar build -m pwa
function doesn’t exist in service-worker.js

[sebastien.roul]

@credwa which version of quasar you use ?