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diff --git a/node_modules/workbox-precaching/utils/showWarningsIfNeeded.mjs b/node_modules/workbox-precaching/utils/showWarningsIfNeeded.mjs
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+++ b/node_modules/workbox-precaching/utils/showWarningsIfNeeded.mjs
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+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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 {logger} from 'workbox-core/_private/logger.mjs';
+import '../_version.mjs';
+
+/**
+ * This method will print out a warning if a precache entry doesn't have
+ * a `revision` value.
+ *
+ * This is common if the asset if revisioned in the url like `index.1234.css`.
+ *
+ * @param {Map} entriesMap
+ *
+ * @private
+ * @memberof module:workbox-preaching
+ */
+export default (entriesMap) => {
+  const urlOnlyEntries = [];
+  entriesMap.forEach(
+    (entry) => {
+      if (typeof entry === 'string' || !entry._originalInput.revision) {
+        urlOnlyEntries.push(entry._originalInput);
+      }
+    }
+  );
+
+  if (urlOnlyEntries.length === 0) {
+    // No warnings needed.
+    return;
+  }
+
+  logger.groupCollapsed('Are your precached assets revisioned?');
+
+  const urlsList = urlOnlyEntries.map((urlOnlyEntry) => {
+    return `    - ${JSON.stringify(urlOnlyEntry)}`;
+  }).join(`\n`);
+
+  logger.warn(
+    `The following precache entries might not be revisioned:` +
+    `\n\n` +
+    urlsList +
+    `\n\n`
+  );
+
+  logger.unprefixed.warn(`You can learn more about why this might be a ` +
+    `problem here: https://developers.google.com/web/tools/workbox/modules/workbox-precaching`);
+
+  logger.groupEnd();
+};