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var events_seen = [];
self.registration.addEventListener('updatefound', function() {
events_seen.push('updatefound');
});
self.addEventListener('activate', function(e) {
events_seen.push('activate');
});
self.addEventListener('fetch', function(e) {
events_seen.push('fetch');
e.respondWith(new Response(events_seen));
});
self.addEventListener('message', function(e) {
events_seen.push('message');
self.registration.update();
});
// update() during the script evaluation should be ignored.
self.registration.update();