register.js

import { Workbox } from 'workbox-window'

if (typeof window !== 'undefined' && 'serviceWorker' in navigator && typeof caches !== 'undefined') {
  if (__PWA_START_URL__) {
    caches.has('start-url').then(function (has) {
      if (!has) {
        caches.open('start-url').then(c => c.put(__PWA_START_URL__, new Response('', { status: 200 })))
      }
    })
  }

  window.workbox = new Workbox(window.location.origin + __PWA_SW__, { scope: __PWA_SCOPE__ })

  if (__PWA_START_URL__) {
    window.workbox.addEventListener('installed', async ({ isUpdate }) => {
      if (!isUpdate) {
        const cache = await caches.open('start-url')
        const response = await fetch(__PWA_START_URL__)
        let _response = response
        if (response.redirected) {
          _response = new Response(response.body, { status: 200, statusText: 'OK', headers: response.headers })
        }

        await cache.put(__PWA_START_URL__, _response)
      }
    })
  }

  window.workbox.addEventListener('installed', async () => {
    const data = window.performance
      .getEntriesByType('resource')
      .map(e => e.name)
      .filter(n => n.startsWith(`${window.location.origin}/_next/data/`) && n.endsWith('.json'))
    const cache = await caches.open('next-data')
    data.forEach(d => cache.add(d))
  })

  if (__PWA_ENABLE_REGISTER__) {
    window.workbox.register()
  }

  if (__PWA_CACHE_ON_FRONT_END_NAV__ || __PWA_START_URL__) {
    const cacheOnFrontEndNav = function (url) {
      if (!window.navigator.onLine) return
      if (__PWA_CACHE_ON_FRONT_END_NAV__ && url !== __PWA_START_URL__) {
        return caches.open('others').then(cache =>
          cache.match(url, { ignoreSearch: true }).then(res => {
            if (!res) return cache.add(url)
            return Promise.resolve()
          })
        )
      } else if (__PWA_START_URL__ && url === __PWA_START_URL__) {
        return fetch(__PWA_START_URL__).then(function (response) {
          if (!response.redirected) {
            return caches.open('start-url').then(cache => cache.put(__PWA_START_URL__, response))
          }
          return Promise.resolve()
        })
      }
    }

    const pushState = history.pushState
    history.pushState = function () {
      pushState.apply(history, arguments)
      cacheOnFrontEndNav(arguments[2])
    }

    const replaceState = history.replaceState
    history.replaceState = function () {
      replaceState.apply(history, arguments)
      cacheOnFrontEndNav(arguments[2])
    }

    window.addEventListener('online', () => {
      cacheOnFrontEndNav(window.location.pathname)
    })
  }

  if (__PWA_RELOAD_ON_ONLINE__) {
    window.addEventListener('online', () => {
      location.reload()
    })
  }
}