如何在cra-template-pwa模板create-react-app应用中正确使用Workbox文件service-worker.js？

如何解决如何在cra-template-pwa模板create-react-app应用中正确使用Workbox文件service-worker.js？

我试图同时使用{strong> create-react-app 3.4.1和4.0.0-next.77（生成的两个应用程序没有区别）来创建新的PWA应用程序>

create-react-app my-app --template cra-template-pwa

代码位于https://github.com/Hongbo-Miao/react-4-js-wb-test

有两个与Service Worker / Workbox相关的文件。

• service-worker.js
• serviceWorkerRegistration.js

这是原始的 service-worker.js ：

/* 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 } from 'workbox-core';
import { ExpirationPlugin } from 'workbox-expiration';
import { precacheAndRoute,createHandlerBoundToURL } from 'workbox-precaching';
import { registerRoute } from 'workbox-routing';
import { StaleWhileRevalidate } from 'workbox-strategies';

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);

// Set up App Shell-style routing,so that all navigation 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 }) => {
    // 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')
);

// An example runtime caching route for requests that aren't handled by the
// precache,in this case same-origin .png requests like those from in public/
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 }),],})
);

// 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.

基于内部和the official doc的评论，我认为我应该能够自定义Workbox。

我通过将unregister()更改为register()来打开 index.js 中的服务人员：

import * as serviceWorkerRegistration from './serviceWorkerRegistration';
serviceWorkerRegistration.register();

但是，我无法使用 service-worker.js 找到任何代码部分，因此即使我添加了

console.log('Workbox got called in service-worker.js');

在内部，console.log在开发环境中从未被调用过

yarn start

不在产品环境中

yarn build
serve build --ssl-cert ./my.crt --ssl-key ./my.key

我尝试添加

import './service-worker';

在 index.js

之上

但是，它将给我错误

非数组：传递给'workbox-precaching.PrecacheController.addToCacheList（）'的参数'entries'必须是数组。

基于错误，如果我将precacheAndRoute(self.__WB_MANIFEST);更改为precacheAndRoute([self.__WB_MANIFEST]);，则错误变为

添加到缓存列表意外类型：意外条目已传递到'workbox-precaching.PrecacheController.addToCacheList（）'。不支持条目'undefined'。您必须提供包含一个或多个字符的字符串数组，具有url属性的对象或Request对象。

如何正确使用Workbox文件 service-worker.js ？谢谢

---

更新：

我发现即使删除了 src / service-worker.js ，然后再次yarn build，它仍然会生成 build / service-worker.js （下面的内容副本），它与原始的 src / service-worker.js 完全无关。

/**
 * Welcome to your Workbox-powered service worker!
 *
 * You'll need to register this file in your web app and you should
 * disable HTTP caching for this file too.
 *
 * The rest of the code is auto-generated. Please don't update this file
 * directly; instead,make changes to your Workbox build configuration
 * and re-run your build process.
 */

importScripts("https://storage.googleapis.com/workbox-cdn/releases/4.3.1/workbox-sw.js");

importScripts(
  "/precache-manifest.e90b8a1c98bf449d45dd07f902f9c090.js"
);

self.addEventListener('message',(event) => {
  if (event.data && event.data.type === 'SKIP_WAITING') {
    self.skipWaiting();
  }
});

workbox.core.clientsClaim();

/**
 * The workboxSW.precacheAndRoute() method efficiently caches and responds to
 * requests for URLs in the manifest.
 */
self.__precacheManifest = [].concat(self.__precacheManifest || []);
workbox.precaching.precacheAndRoute(self.__precacheManifest,{});

workbox.routing.registerNavigationRoute(workbox.precaching.getCacheKeyForURL("/index.html"),{
  
  blacklist: [/^\/_/,/\/[^/?]+\.[^/]+$/],});

解决方法

在serviceWorkerRegistration.js内部进行浏览，它正在注册service-worker：

window.addEventListener("load",() => {
            const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;

同样，您无法移动此文件（由于使用了Workbox InjectManifest工具，该工具将self.__WB_MANIFEST替换为您的静态资产列表）。

将CRA与正确的模板一起使用后，一切都可以直接使用（当然，调用.register()方法除外）。

我个人选择不在src\service.worker.js中添加过多的自定义代码，而是在其中导入我自己的代码（因为已被编译，因此您可以包括任何想要的内容）。