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async function registerServiceWorker(win, url) {
let reg = await win.navigator.serviceWorker.register(url);
if (reg.installing.state !== "activated") {
await new Promise(resolve => {
let w = reg.installing;
w.addEventListener("statechange", function onStateChange() {
if (w.state === "activated") {
w.removeEventListener("statechange", onStateChange);
resolve();
}
});
});
}
return reg.active;
}
function sendAndWaitWorkerMessage(target, worker, message) {
return new Promise(resolve => {
worker.addEventListener(
"message",
msg => {
resolve(msg.data);
},
{ once: true }
);
target.postMessage(message);
});
}