main.js     // Make Sure service work is supported   if ( ' serviceWorker '  in  navigator ){       console . log ( ' Service work is supported ' );       window . addEventListener ( ' load ' , () => {           navigator . serviceWorker . register ( ' ./sw_cached_pages_V2.js ' )           . then ( reg  => console . log ( " Service Worker: Registered " ))           . catch ( err  =>  console . log ( ` Service Worker: Error : ${ err } ` ))       })   }     sw_cached_pages_V2.js     // Service Worker Fetch all data from sites   const  cacheName  =  " v2 " ;   // call install Events   self . addEventListener ( ' install ' , function  ( event )  {   });   // call Activate Events   self . addEventListener ( ' activate ' , e  =>  {       console . log ( " ServiceWorker: Activated " );       e . waitUntil (           caches . keys (). then ( cacheNames  =>  {               return  Promise . all (   ...
 
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