PWA Day05 - fetch event

sw.js

self.addEventListener('fetch', event => {
  console.log('[Service Worker] - fetch event')

  event.respondWith(
    self
      .caches
      .match(event.request)
      .then(result => {
        if (result == null) {
          return fetch(event.request)
        }

        return result
      })
      .catch(error => {
        console.error('Fetch Failed', error)
      })
  )
})