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async function probe() {
const result = { controlled: !!self.navigator.serviceWorker.controller };
try {
const response = await fetch("probe?" + Math.random());
result.status = response.status;
result.body = await response.text();
} catch (e) {
result.error = e.message;
}
return result;
}
self.addEventListener("message", async function () {
postMessage(await probe());
});