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6 changes: 2 additions & 4 deletions service-worker/prefetch/service-worker.js
Original file line number Diff line number Diff line change
Expand Up @@ -98,15 +98,13 @@ self.addEventListener('activate', function(event) {
// Delete all caches that aren't named in CURRENT_CACHES.
// While there is only one cache in this example, the same logic will handle the case where
// there are multiple versioned caches.
var expectedCacheNames = Object.keys(CURRENT_CACHES).map(function(key) {
return CURRENT_CACHES[key];
});
var expectedCacheNames = Object.values(CURRENT_CACHES);

event.waitUntil(
caches.keys().then(function(cacheNames) {
return Promise.all(
cacheNames.map(function(cacheName) {
if (expectedCacheNames.indexOf(cacheName) === -1) {
if (!expectedCacheNames.includes(cacheName)) {
// If this cache name isn't present in the array of "expected" cache names, then delete it.
console.log('Deleting out of date cache:', cacheName);
return caches.delete(cacheName);
Expand Down