v1.0 with SW PWA enabled

frontend/node_modules/workbox-strategies/CacheFirst.js

@@ -0,0 +1,89 @@
+/*
+  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-first](https://developer.chrome.com/docs/workbox/caching-strategies-overview/#cache-first-falling-back-to-network)
+ * request strategy.
+ *
+ * A cache first strategy is useful for assets that have been revisioned,
+ * such as URLs like `/styles/example.a8f5f1.css`, since they
+ * can be cached for long periods of time.
+ *
+ * If the network request fails, and there is no cache match, this will throw
+ * a `WorkboxError` exception.
+ *
+ * @extends workbox-strategies.Strategy
+ * @memberof workbox-strategies
+ */
+class CacheFirst 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) {
+        const logs = [];
+        if (process.env.NODE_ENV !== 'production') {
+            assert.isInstance(request, Request, {
+                moduleName: 'workbox-strategies',
+                className: this.constructor.name,
+                funcName: 'makeRequest',
+                paramName: 'request',
+            });
+        }
+        let response = await handler.cacheMatch(request);
+        let error = undefined;
+        if (!response) {
+            if (process.env.NODE_ENV !== 'production') {
+                logs.push(`No response found in the '${this.cacheName}' cache. ` +
+                    `Will respond with a network request.`);
+            }
+            try {
+                response = await handler.fetchAndCachePut(request);
+            }
+            catch (err) {
+                if (err instanceof Error) {
+                    error = err;
+                }
+            }
+            if (process.env.NODE_ENV !== 'production') {
+                if (response) {
+                    logs.push(`Got response from network.`);
+                }
+                else {
+                    logs.push(`Unable to get a response from the network.`);
+                }
+            }
+        }
+        else {
+            if (process.env.NODE_ENV !== 'production') {
+                logs.push(`Found a cached response in the '${this.cacheName}' cache.`);
+            }
+        }
+        if (process.env.NODE_ENV !== 'production') {
+            logger.groupCollapsed(messages.strategyStart(this.constructor.name, request));
+            for (const log of logs) {
+                logger.log(log);
+            }
+            messages.printFinalResponse(response);
+            logger.groupEnd();
+        }
+        if (!response) {
+            throw new WorkboxError('no-response', { url: request.url, error });
+        }
+        return response;
+    }
+}
+export { CacheFirst };