Initial Commit

node_modules/web-vitals/dist/modules/lib/getNavigationEntry.js

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * 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.
+ */
+export const getNavigationEntry = () => {
+    const navigationEntry = self.performance &&
+        performance.getEntriesByType &&
+        performance.getEntriesByType('navigation')[0];
+    // Check to ensure the `responseStart` property is present and valid.
+    // In some cases no value is reported by the browser (for
+    // privacy/security reasons), and in other cases (bugs) the value is
+    // negative or is larger than the current page time. Ignore these cases:
+    // https://github.com/GoogleChrome/web-vitals/issues/137
+    // https://github.com/GoogleChrome/web-vitals/issues/162
+    // https://github.com/GoogleChrome/web-vitals/issues/275
+    if (navigationEntry &&
+        navigationEntry.responseStart > 0 &&
+        navigationEntry.responseStart < performance.now()) {
+        return navigationEntry;
+    }
+};