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diff --git a/node_modules/workbox-broadcast-cache-update/utils/responsesAreSame.mjs b/node_modules/workbox-broadcast-cache-update/utils/responsesAreSame.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 {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';
+import {logger} from 'workbox-core/_private/logger.mjs';
+import '../_version.mjs';
+
+/**
+ * Given two `Response's`, compares several header values to see if they are
+ * the same or not.
+ *
+ * @param {Response} firstResponse
+ * @param {Response} secondResponse
+ * @param {Array<string>} headersToCheck
+ * @return {boolean}
+ *
+ * @memberof workbox.broadcastUpdate
+ * @private
+ */
+const responsesAreSame = (firstResponse, secondResponse, headersToCheck) => {
+  if (process.env.NODE_ENV !== 'production') {
+    if (!(firstResponse instanceof Response &&
+      secondResponse instanceof Response)) {
+      throw new WorkboxError('invalid-responses-are-same-args');
+    }
+  }
+
+  const atLeastOneHeaderAvailable = headersToCheck.some((header) => {
+    return firstResponse.headers.has(header) &&
+      secondResponse.headers.has(header);
+  });
+
+  if (!atLeastOneHeaderAvailable) {
+    if (process.env.NODE_ENV !== 'production') {
+      logger.warn(`Unable to determine where the response has been updated ` +
+        `because none of the headers that would be checked are present.`);
+      logger.debug(`Attempting to compare the following: `,
+        firstResponse, secondResponse, headersToCheck);
+    }
+
+    // Just return true, indicating the that responses are the same, since we
+    // can't determine otherwise.
+    return true;
+  }
+
+  return headersToCheck.every((header) => {
+    const headerStateComparison = firstResponse.headers.has(header) ===
+      secondResponse.headers.has(header);
+    const headerValueComparison = firstResponse.headers.get(header) ===
+      secondResponse.headers.get(header);
+
+    return headerStateComparison && headerValueComparison;
+  });
+};
+
+export {responsesAreSame};