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diff --git a/node_modules/workbox-streams/utils/createHeaders.mjs b/node_modules/workbox-streams/utils/createHeaders.mjs
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+/*
+ Copyright 2018 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';
+
+/**
+ * This is a utility method that determines whether the current browser supports
+ * the features required to create streamed responses. Currently, it checks if
+ * [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/ReadableStream)
+ * is available.
+ *
+ * @param {HeadersInit} [headersInit] If there's no `Content-Type` specified,
+ * `'text/html'` will be used by default.
+ * @return {boolean} `true`, if the current browser meets the requirements for
+ * streaming responses, and `false` otherwise.
+ *
+ * @memberof workbox.streams
+ */
+function createHeaders(headersInit = {}) {
+  // See https://github.com/GoogleChrome/workbox/issues/1461
+  const headers = new Headers(headersInit);
+  if (!headers.has('content-type')) {
+    headers.set('content-type', 'text/html');
+  }
+  return headers;
+}
+
+export {createHeaders};