88 lines
2.7 KiB
TypeScript
88 lines
2.7 KiB
TypeScript
/*
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Copyright 2020 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import {setCatchHandler} from 'workbox-routing/setCatchHandler.js';
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import {matchPrecache} from 'workbox-precaching/matchPrecache.js';
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import {RouteHandler, RouteHandlerCallbackOptions} from 'workbox-core/types.js';
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import './_version.js';
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export interface OfflineFallbackOptions {
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pageFallback?: string;
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imageFallback?: string;
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fontFallback?: string;
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}
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// Give TypeScript the correct global.
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declare let self: ServiceWorkerGlobalScope;
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/**
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* An implementation of the [comprehensive fallbacks recipe]{@link https://developers.google.com/web/tools/workbox/guides/advanced-recipes#comprehensive_fallbacks}. Be sure to include the fallbacks in your precache injection
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*
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* @memberof workbox-recipes
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*
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* @param {Object} [options]
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* @param {string} [options.pageFallback] Precache name to match for pag fallbacks. Defaults to offline.html
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* @param {string} [options.imageFallback] Precache name to match for image fallbacks.
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* @param {string} [options.fontFallback] Precache name to match for font fallbacks.
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*/
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function offlineFallback(options: OfflineFallbackOptions = {}): void {
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const pageFallback = options.pageFallback || 'offline.html';
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const imageFallback = options.imageFallback || false;
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const fontFallback = options.fontFallback || false;
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self.addEventListener('install', (event) => {
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const files = [pageFallback];
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if (imageFallback) {
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files.push(imageFallback);
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}
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if (fontFallback) {
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files.push(fontFallback);
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}
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event.waitUntil(
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self.caches
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.open('workbox-offline-fallbacks')
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.then((cache) => cache.addAll(files)),
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);
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});
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const handler: RouteHandler = async (
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options: RouteHandlerCallbackOptions,
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) => {
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const dest = options.request.destination;
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const cache = await self.caches.open('workbox-offline-fallbacks');
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if (dest === 'document') {
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const match =
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(await matchPrecache(pageFallback)) ||
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(await cache.match(pageFallback));
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return match || Response.error();
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}
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if (dest === 'image' && imageFallback !== false) {
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const match =
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(await matchPrecache(imageFallback)) ||
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(await cache.match(imageFallback));
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return match || Response.error();
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}
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if (dest === 'font' && fontFallback !== false) {
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const match =
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(await matchPrecache(fontFallback)) ||
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(await cache.match(fontFallback));
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return match || Response.error();
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}
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return Response.error();
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};
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setCatchHandler(handler);
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}
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export {offlineFallback};
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