lifecycle6

sw.js

self.addEventListener('activate', event => {
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames
          .filter(cacheName => cacheName.startsWith('my-cache-v') 
             && cacheName !== CACHENAME)
          .map(cacheName => caches.delete(cacheName))
      )
    })
  )
});