testing/web-platform/tests/service-workers/service-worker/resources/claim-shared-worker-fetch-worker.js


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self.onconnect = (event) => {
  var port = event.ports[0];
  event.ports[0].onmessage = (evt) => {
    fetch(evt.data)
      .then(response => response.text())
      .then(text => port.postMessage(text));
  };
};