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onmessage = e => {
// Collect all client URLs in this origin.
const options = { includeUncontrolled: true, type: 'all' };
const promise = self.clients.matchAll(options)
.then(clients => {
const client_urls = [];
clients.forEach(client => client_urls.push(client.url));
e.source.postMessage(client_urls);
});
e.waitUntil(promise);
};