serviceworker.js

addEventListener('backgroundfetchclick', async (event) => {
  const bgFetch = event.registration
  if (bgFetch.result === 'success') {
    const cache = await caches.open('postr-download')
    const records = await cache.matchAll()
    const cacheList = []
    for (const record of records) {
      const recordDate = new Date(record.headers.get('date'))
      cacheList.push({
        url: record.url,
        date: recordDate.getTime() / 1000
      })
    }

    clients.openWindow(cacheList.sort((a, b) => b.date - a.date)[0].url)
  }
})