serviceworker.js

addEventListener('backgroundfetchsuccess', event => {
  event.updateUI({
    title: 'Postr.me capturing sucessful',
    icons: [{
      sizes: '512x512',
      src: '/assets/img/icon-512.png',
      type: 'image/png'
    }]
  })
  event.waitUntil(
    (async () => {
      try {
        const cache = await caches.open(event.registration.id)
        const records = await event.registration.matchAll()
        const promises = records.map(async record => {
          const response = await record.responseReady
          await cache.put(record.request, response)
        })
        await Promise.all(promises)
      } catch (err) {
        console.error(err)
      }
    })()
  )
})