File: doc-service-workers.html

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<script>
async function registerWorker() {
  const sw = navigator.serviceWorker;
  const swr = await sw.register("service-worker.sjs", { scope: "" });
  dump(`Registered, scope is: ${swr.scope}\n`);

  await new Promise(resolve => {
    const worker = swr.installing || swr.waiting || swr.active;
    if (worker.state === 'activated') {
      return resolve();
    }

    worker.addEventListener('statechange', () => {
      if (worker.state === 'activated') {
        return resolve();
      }
    });
  });
}

async function unregisterWorker() {
  const sw = navigator.serviceWorker;
  const swr = await sw.register("service-worker.sjs", { scope: "" });
  return swr.unregister();
}

async function fetchFromWorker() {
  const response = await fetch("whatever");
  const text = await response.text();
  console.log(`Response ${text}`);
}

async function registerAndFetchFromWorker() {
  await registerWorker();
  await fetchFromWorker();
}

fetchFromWorker();
</script>