1 files changed, 37 insertions, 0 deletions
diff --git a/frontend-old/node_modules/web-vitals/src/lib/getNavigationEntry.ts b/frontend-old/node_modules/web-vitals/src/lib/getNavigationEntry.ts
new file mode 100644
index 0000000..19d18cf
--- /dev/null
+++ b/frontend-old/node_modules/web-vitals/src/lib/getNavigationEntry.ts
@@ -0,0 +1,37 @@
+/*
+ * 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 = (): PerformanceNavigationTiming | void => {
+  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;
+  }
+};