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diff --git a/node_modules/workbox-broadcast-cache-update/broadcastUpdate.mjs b/node_modules/workbox-broadcast-cache-update/broadcastUpdate.mjs
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+/*
+ Copyright 2016 Google Inc. All Rights Reserved.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+import {assert} from 'workbox-core/_private/assert.mjs';
+import {logger} from 'workbox-core/_private/logger.mjs';
+import messageTypes from './messageTypes.mjs';
+import './_version.mjs';
+
+/**
+ * You would not normally call this method directly; it's called automatically
+ * by an instance of the {@link BroadcastCacheUpdate} class. It's exposed here
+ * for the benefit of developers who would rather not use the full
+ * `BroadcastCacheUpdate` implementation.
+ *
+ * Calling this will dispatch a message on the provided
+ * {@link https://developers.google.com/web/updates/2016/09/broadcastchannel|Broadcast Channel}
+ * to notify interested subscribers about a change to a cached resource.
+ *
+ * The message that's posted has a formation inspired by the
+ * [Flux standard action](https://github.com/acdlite/flux-standard-action#introduction)
+ * format like so:
+ *
+ * ```
+ * {
+ *   type: 'CACHE_UPDATED',
+ *   meta: 'workbox-broadcast-cache-update',
+ *   payload: {
+ *     cacheName: 'the-cache-name',
+ *     updatedUrl: 'https://example.com/'
+ *   }
+ * }
+ * ```
+ *
+ * (Usage of [Flux](https://facebook.github.io/flux/) itself is not at
+ * all required.)
+ *
+ * @param {BroadcastChannel} channel The `BroadcastChannel` to use.
+ * @param {string} cacheName The name of the cache in which the updated
+ *        `Response` was stored.
+ * @param {string} url The URL associated with the updated `Response`.
+ * @param {string} source A string identifying this library as the source
+ *        of the update message.
+ *
+ * @memberof workbox.broadcastUpdate
+ */
+const broadcastUpdate = (channel, cacheName, url, source) => {
+  // There are browsers which support service workers but don't support the
+  // Broadcast Channel API.
+  // See https://github.com/GoogleChrome/workbox/issues/1304
+  if (!(('BroadcastChannel' in self) && channel)) {
+    if (process.env.NODE_ENV !== 'production') {
+      logger.debug(`${url} was updated, but the Broadcast Channel API is not ` +
+        `available in the current browser.`);
+    }
+    return;
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    assert.isInstance(channel, BroadcastChannel, {
+      moduleName: 'workbox-broadcast-cache-update',
+      className: '~',
+      funcName: 'broadcastUpdate',
+      paramName: 'channel',
+    });
+    assert.isType(cacheName, 'string', {
+      moduleName: 'workbox-broadcast-cache-update',
+      className: '~',
+      funcName: 'broadcastUpdate',
+      paramName: 'cacheName',
+    });
+    assert.isType(url, 'string', {
+      moduleName: 'workbox-broadcast-cache-update',
+      className: '~',
+      funcName: 'broadcastUpdate',
+      paramName: 'url',
+    });
+    assert.isType(source, 'string', {
+      moduleName: 'workbox-broadcast-cache-update',
+      className: '~',
+      funcName: 'broadcastUpdate',
+      paramName: 'source',
+    });
+  }
+
+  channel.postMessage({
+    type: messageTypes.CACHE_UPDATED,
+    meta: source,
+    payload: {
+      cacheName: cacheName,
+      updatedUrl: url,
+    },
+  });
+};
+
+export {broadcastUpdate};