const oca_pwa = new PWA();
evt.waitUntil(oca_pwa.installWorker());
self.skipWaiting();
self.addEventListener('install', evt => {
console.log('[ServiceWorker] Installing...');
});
self.addEventListener('fetch', evt => {
});
console.log('[ServiceWorker] Activating...');
evt.waitUntil(oca_pwa.activateWorker());
self.clients.claim();
self.addEventListener('activate', evt => {
});
self.importScripts(...);