1 files changed, 29 insertions, 0 deletions
diff --git a/node_modules/workbox-navigation-preload/utils/isSupported.mjs b/node_modules/workbox-navigation-preload/utils/isSupported.mjs
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--- /dev/null
+++ b/node_modules/workbox-navigation-preload/utils/isSupported.mjs
@@ -0,0 +1,29 @@
+/*
+  Copyright 2018 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 '../_version.mjs';
+
+/**
+ * @return {boolean} Whether or not the current browser supports enabling
+ * navigation preload.
+ *
+ * @memberof workbox.navigationPreload
+ */
+function isSupported() {
+  return Boolean(self.registration && self.registration.navigationPreload);
+}
+
+export {isSupported};