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setTimeout(() => {
navigator.serviceWorker.onmessage = e => self.postMessage(e.data);
}, 500);
setTimeout(() => {
self.postMessage("No message received");
}, 5000);
setTimeout(() => {
navigator.serviceWorker.onmessage = e => self.postMessage(e.data);
}, 500);
setTimeout(() => {
self.postMessage("No message received");
}, 5000);