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npm update -g @bubblewrap/cli bubblewrap update bubblewrap build 

bubblewrap merge bubblewrap update bubblewrap build 

self.addEventListener('fetch', event => {   event.respondWith((async () => {     try {       return await fetchAndHandleError(event.request);     } catch {       // Failed to load from the network. User is offline or the response       // has a status code that triggers the Quality Criteria.       // Try loading from cache.       const cachedResponse = await caches.match(event.request);       if (cachedResponse) {         return cachedResponse;       }       // Response was not found on the cache. Send the error / offline       // page. OFFLINE_PAGE should be pre-cached when the service worker       // is activated.       return await caches.match(OFFLINE_PAGE);     }   })()); });  async function fetchAndHandleError(request) {   const cache = await caches.open(RUNTIME_CACHE);   const response = await fetch(request);    // Throw an error if the response returns one of the status   // that trigger the Quality Criteria.   if (response.status === 404 ||       response.status >= 500 && response.status < 600) {     throw new Error(`Server responded with status: ${response.status}`);   }    // Cache the response if the request is successful.   cache.put(request, response.clone());   return response; } 

export class FallbackOnErrorPlugin {   constructor(offlineFallbackUrl, notFoundFallbackUrl, serverErrorFallbackUrl) {     this.notFoundFallbackUrl = notFoundFallbackUrl;     this.offlineFallbackUrl = offlineFallbackUrl;     this.serverErrorFallbackUrl = serverErrorFallbackUrl;   }    checkTrustedWebActivityCrash(response) {     if (response.status === 404 || response.status >= 500 && response.status <= 600) {       const type = response.status === 404 ? 'E_NOT_FOUND' : 'E_SERVER_ERROR';       const error = new Error(`Invalid response status (${response.status})`);       error.type = type;       throw error;     }   }    // This is called whenever there's a network response,   // but we want special behavior for 404 and 5**.   fetchDidSucceed({response}) {     // Cause a crash if this is a Trusted Web Activity crash.     this.checkTrustedWebActivityCrash(response);      // If it's a good response, it can be used as-is.     return response;   }    // This callback is new in Workbox v6, and is triggered whenever   // an error (including a NetworkError) is thrown when a handler runs.   handlerDidError(details) {     let fallbackURL;     switch (details.error.details.error.type) {       case 'E_NOT_FOUND': fallbackURL = this.notFoundFallbackUrl; break;       case 'E_SERVER_ERROR': fallbackURL = this.serverErrorFallbackUrl; break;       default: fallbackURL = this.offlineFallbackUrl;     }      return caches.match(fallbackURL, {       // Use ignoreSearch as a shortcut to work with precached URLs       // that have _WB_REVISION parameters.       ignoreSearch: true,     });   } }