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diff --git a/node_modules/workbox-background-sync/models/StorableRequest.mjs b/node_modules/workbox-background-sync/models/StorableRequest.mjs
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+/*
+ Copyright 2017 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 '../_version.mjs';
+
+const serializableProperties = [
+  'method',
+  'referrer',
+  'referrerPolicy',
+  'mode',
+  'credentials',
+  'cache',
+  'redirect',
+  'integrity',
+  'keepalive',
+];
+
+
+/**
+ * A class to make it easier to serialize and de-serialize requests so they
+ * can be stored in IndexedDB.
+ *
+ * @private
+ */
+export default class StorableRequest {
+  /**
+   * Converts a Request object to a plain object that can be structured
+   * cloned or JSON-stringified.
+   *
+   * @param {Request} request
+   * @return {Promise<StorableRequest>}
+   *
+   * @private
+   */
+  static async fromRequest(request) {
+    const requestInit = {headers: {}};
+
+    // Set the body if present.
+    if (request.method !== 'GET') {
+      // Use blob to support non-text request bodies,
+      // and clone first in case the caller still needs the request.
+      requestInit.body = await request.clone().blob();
+    }
+
+    // Convert the headers from an iterable to an object.
+    for (const [key, value] of request.headers.entries()) {
+      requestInit.headers[key] = value;
+    }
+
+    // Add all other serializable request properties
+    for (const prop of serializableProperties) {
+      if (request[prop] !== undefined) {
+        requestInit[prop] = request[prop];
+      }
+    }
+
+    return new StorableRequest({url: request.url, requestInit});
+  }
+
+  /**
+   * Accepts a URL and RequestInit dictionary that can be used to create a
+   * new Request object. A timestamp is also generated so consumers can
+   * reference when the object was created.
+   *
+   * @param {Object} param1
+   * @param {string} param1.url
+   * @param {Object} param1.requestInit
+   *     See: https://fetch.spec.whatwg.org/#requestinit
+   * @param {number} param1.timestamp The time the request was created,
+   *     defaulting to the current time if not specified.
+   *
+   * @private
+   */
+  constructor({url, requestInit, timestamp = Date.now()}) {
+    this.url = url;
+    this.requestInit = requestInit;
+
+    // "Private"
+    this._timestamp = timestamp;
+  }
+
+  /**
+   * Gets the private _timestamp property.
+   *
+   * @return {number}
+   *
+   * @private
+   */
+  get timestamp() {
+    return this._timestamp;
+  }
+
+  /**
+   * Coverts this instance to a plain Object.
+   *
+   * @return {Object}
+   *
+   * @private
+   */
+  toObject() {
+    return {
+      url: this.url,
+      timestamp: this.timestamp,
+      requestInit: this.requestInit,
+    };
+  }
+
+  /**
+   * Converts this instance to a Request.
+   *
+   * @return {Request}
+   *
+   * @private
+   */
+  toRequest() {
+    return new Request(this.url, this.requestInit);
+  }
+
+  /**
+   * Creates and returns a deep clone of the instance.
+   *
+   * @return {StorableRequest}
+   *
+   * @private
+   */
+  clone() {
+    const requestInit = Object.assign({}, this.requestInit);
+    requestInit.headers = Object.assign({}, this.requestInit.headers);
+    if (this.requestInit.body) {
+      requestInit.body = this.requestInit.body.slice();
+    }
+
+    return new StorableRequest({
+      url: this.url,
+      timestamp: this.timestamp,
+      requestInit,
+    });
+  }
+}