v1.0 with SW PWA enabled

frontend/node_modules/workbox-streams/strategy.js

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+/*
+  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 { logger } from 'workbox-core/_private/logger.js';
+import { createHeaders } from './utils/createHeaders.js';
+import { concatenateToResponse } from './concatenateToResponse.js';
+import { isSupported } from './isSupported.js';
+import './_version.js';
+/**
+ * A shortcut to create a strategy that could be dropped-in to Workbox's router.
+ *
+ * On browsers that do not support constructing new `ReadableStream`s, this
+ * strategy will automatically wait for all the `sourceFunctions` to complete,
+ * and create a final response that concatenates their values together.
+ *
+ * @param {Array<function({event, request, url, params})>} sourceFunctions
+ * An array of functions similar to {@link workbox-routing~handlerCallback}
+ * but that instead return a {@link workbox-streams.StreamSource} (or a
+ * Promise which resolves to one).
+ * @param {HeadersInit} [headersInit] If there's no `Content-Type` specified,
+ * `'text/html'` will be used by default.
+ * @return {workbox-routing~handlerCallback}
+ * @memberof workbox-streams
+ */
+function strategy(sourceFunctions, headersInit) {
+    return async ({ event, request, url, params }) => {
+        const sourcePromises = sourceFunctions.map((fn) => {
+            // Ensure the return value of the function is always a promise.
+            return Promise.resolve(fn({ event, request, url, params }));
+        });
+        if (isSupported()) {
+            const { done, response } = concatenateToResponse(sourcePromises, headersInit);
+            if (event) {
+                event.waitUntil(done);
+            }
+            return response;
+        }
+        if (process.env.NODE_ENV !== 'production') {
+            logger.log(`The current browser doesn't support creating response ` +
+                `streams. Falling back to non-streaming response instead.`);
+        }
+        // Fallback to waiting for everything to finish, and concatenating the
+        // responses.
+        const blobPartsPromises = sourcePromises.map(async (sourcePromise) => {
+            const source = await sourcePromise;
+            if (source instanceof Response) {
+                return source.blob();
+            }
+            else {
+                // Technically, a `StreamSource` object can include any valid
+                // `BodyInit` type, including `FormData` and `URLSearchParams`, which
+                // cannot be passed to the Blob constructor directly, so we have to
+                // convert them to actual Blobs first.
+                return new Response(source).blob();
+            }
+        });
+        const blobParts = await Promise.all(blobPartsPromises);
+        const headers = createHeaders(headersInit);
+        // Constructing a new Response from a Blob source is well-supported.
+        // So is constructing a new Blob from multiple source Blobs or strings.
+        return new Response(new Blob(blobParts), { headers });
+    };
+}
+export { strategy };