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// Copyright 2020 The Chromium Authors // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. self.addEventListener('install', evt => { evt.waitUntil(async function() { return Promise.all([ fetch('./foo/1?block').then(r => r.blob()), fetch('./foo/2?block').then(r => r.blob()), fetch('./foo/3?block').then(r => r.blob()), ]); }()); });