v1.0 with SW PWA enabled

frontend/node_modules/workbox-strategies/CacheOnly.js

@@ -0,0 +1,61 @@
+/*
+  Copyright 2018 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+import { assert } from 'workbox-core/_private/assert.js';
+import { logger } from 'workbox-core/_private/logger.js';
+import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
+import { Strategy } from './Strategy.js';
+import { messages } from './utils/messages.js';
+import './_version.js';
+/**
+ * An implementation of a [cache-only](https://developer.chrome.com/docs/workbox/caching-strategies-overview/#cache-only)
+ * request strategy.
+ *
+ * This class is useful if you want to take advantage of any
+ * [Workbox plugins](https://developer.chrome.com/docs/workbox/using-plugins/).
+ *
+ * If there is no cache match, this will throw a `WorkboxError` exception.
+ *
+ * @extends workbox-strategies.Strategy
+ * @memberof workbox-strategies
+ */
+class CacheOnly extends Strategy {
+    /**
+     * @private
+     * @param {Request|string} request A request to run this strategy for.
+     * @param {workbox-strategies.StrategyHandler} handler The event that
+     *     triggered the request.
+     * @return {Promise<Response>}
+     */
+    async _handle(request, handler) {
+        if (process.env.NODE_ENV !== 'production') {
+            assert.isInstance(request, Request, {
+                moduleName: 'workbox-strategies',
+                className: this.constructor.name,
+                funcName: 'makeRequest',
+                paramName: 'request',
+            });
+        }
+        const response = await handler.cacheMatch(request);
+        if (process.env.NODE_ENV !== 'production') {
+            logger.groupCollapsed(messages.strategyStart(this.constructor.name, request));
+            if (response) {
+                logger.log(`Found a cached response in the '${this.cacheName}' ` + `cache.`);
+                messages.printFinalResponse(response);
+            }
+            else {
+                logger.log(`No response found in the '${this.cacheName}' cache.`);
+            }
+            logger.groupEnd();
+        }
+        if (!response) {
+            throw new WorkboxError('no-response', { url: request.url });
+        }
+        return response;
+    }
+}
+export { CacheOnly };