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diff --git a/node_modules/workbox-broadcast-cache-update/Plugin.mjs b/node_modules/workbox-broadcast-cache-update/Plugin.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 {BroadcastCacheUpdate} from './BroadcastCacheUpdate.mjs';
+import './_version.mjs';
+
+/**
+ * This plugin will automatically broadcast a message whenever a cached response
+ * is updated.
+ *
+ * @memberof workbox.broadcastUpdate
+ */
+class Plugin {
+    /**
+   * Construct a new instance with a specific `channelName` to
+   * broadcast messages on
+   *
+   * @param {string} channelName The name that will be used when creating
+   * the `BroadcastChannel`.
+   * @param {Object} options
+   * @param {Array<string>}
+   * [options.headersToCheck=['content-length', 'etag', 'last-modified']] A
+   * list of headers that will be used to determine whether the responses
+   * differ.
+   * @param {string} [options.source='workbox-broadcast-cache-update'] An
+   * attribution value that indicates where the update originated.
+   */
+  constructor(channelName, options) {
+    this._broadcastUpdate = new BroadcastCacheUpdate(channelName, options);
+  }
+  /**
+   * A "lifecycle" callback that will be triggered automatically by the
+   * `workbox-sw` and `workbox-runtime-caching` handlers when an entry is
+   * added to a cache.
+   *
+   * @private
+   * @param {Object} options The input object to this function.
+   * @param {string} options.cacheName Name of the cache being updated.
+   * @param {Response} [options.oldResponse] The previous cached value, if any.
+   * @param {Response} options.newResponse The new value in the cache.
+   */
+  cacheDidUpdate({cacheName, oldResponse, newResponse, request}) {
+    if (process.env.NODE_ENV !== 'production') {
+      assert.isType(cacheName, 'string', {
+        moduleName: 'workbox-broadcast-cache-update',
+        className: 'Plugin',
+        funcName: 'cacheDidUpdate',
+        paramName: 'cacheName',
+      });
+      assert.isInstance(newResponse, Response, {
+        moduleName: 'workbox-broadcast-cache-update',
+        className: 'Plugin',
+        funcName: 'cacheDidUpdate',
+        paramName: 'newResponse',
+      });
+      assert.isInstance(request, Request, {
+        moduleName: 'workbox-broadcast-cache-update',
+        className: 'Plugin',
+        funcName: 'cacheDidUpdate',
+        paramName: 'request',
+      });
+    }
+
+    if (!oldResponse) {
+      // Without a two responses there is nothing to compare.
+      return;
+    }
+
+    this._broadcastUpdate
+      .notifyIfUpdated(oldResponse, newResponse, request.url, cacheName);
+  }
+}
+
+export {Plugin};