service-worker.ts

// service-worker.ts
/// <reference lib="webworker" />
/* eslint-disable no-restricted-globals */

// This service worker can be customized!
// See https://developers.google.com/web/tools/workbox/modules
// for the list of available Workbox modules, or add any other
// code you'd like.
// You can also remove this file if you'd prefer not to use a
// service worker, and the Workbox build step will be skipped.

import { clientsClaim, setCacheNameDetails } from 'workbox-core';
import { ExpirationPlugin } from 'workbox-expiration';
import { precacheAndRoute, createHandlerBoundToURL, matchPrecache } from 'workbox-precaching';
import { registerRoute, setCatchHandler } from 'workbox-routing';
import { StaleWhileRevalidate } from 'workbox-strategies';
import { CacheableResponsePlugin } from 'workbox-cacheable-response';

// 캐시 이름
// 빌드 일시 2021-05-18 18:50
// build/asset-manifest4json 의 index.html 삭제하기
setCacheNameDetails({
  prefix: 'weather-service',
  suffix: 'v25',
  precache: 'weather-service-precache',
});

declare const self: ServiceWorkerGlobalScope;

clientsClaim();

// Precache all of the assets generated by your build process.
// Their URLs are injected into the manifest variable below.
// This variable must be present somewhere in your service worker file,
// even if you decide not to use precaching. See https://cra.link/PWA
precacheAndRoute(self.__WB_MANIFEST);

// Catch routing errors, like if the user is offline
setCatchHandler(async ({ event }: any) => {
  // Return the precached offline page if a document is being requested
  if (event.request.destination === 'document') {
    return matchPrecache('/offline.html');
  }

  return Response.error();
});

// Set up App Shell-style routing, so that all navi gation requests
// are fulfilled with your index.html shell. Learn more at
// https://developers.google.com/web/fundamentals/architecture/app-shell
const fileExtensionRegexp = new RegExp('/[^/?]+\\.[^/]+$');
registerRoute(
  // Return false to exempt requests from being fulfilled by index.html.
  ({ request, url }: { request: Request; url: URL }) => {
    // If this isn't a navigation, skip.
    if (request.mode !== 'navigate') {
      return false;
    }

    // If this is a URL that starts with /_, skip.
    if (url.pathname.startsWith('/_')) {
      return false;
    }

    // If this looks like a URL for a resource, because it contains
    // a file extension, skip.
    if (url.pathname.match(fileExtensionRegexp)) {
      return false;
    }

    // Return true to signal that we want to use the handler.
    return true;
  },
  createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html'),
);

// 폰트 캐싱
registerRoute(
  // Add in any other file extensions or routing criteria as needed.
  ({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'),
  // Customize this strategy as needed, e.g., by changing to CacheFirst.
  new StaleWhileRevalidate({
    cacheName: 'images',
    plugins: [
      // Ensure that once this runtime cache reaches a maximum size the
      // least-recently used images are removed.
      new ExpirationPlugin({ maxEntries: 50 }),
    ],
  }),
);

// 이미지 캐싱
registerRoute(
  // Add in any other file extensions or routing criteria as needed.
  ({ request }) => request.destination === 'image',
  // Customize this strategy as needed, e.g., by changing to CacheFirst.
  new StaleWhileRevalidate({
    cacheName: 'image-cache',
    plugins: [
      // Ensure that once this runtime cache reaches a maximum size the
      // least-recently used images are removed.
      new CacheableResponsePlugin({
        statuses: [200],
      }),
      new ExpirationPlugin({ maxEntries: 50 }),
    ],
  }),
);

// This allows the web app to trigger skipWaiting via
// registration.waiting.postMessage({type: 'SKIP_WAITING'})
self.addEventListener('message', (event) => {
  if (event.data && event.data.type === 'SKIP_WAITING') {
    self.skipWaiting();
  }
});

// Any other custom service worker logic can go here.