1 files changed, 23 insertions, 0 deletions
diff --git a/frontend-old/node_modules/web-vitals/src/lib/onHidden.ts b/frontend-old/node_modules/web-vitals/src/lib/onHidden.ts
new file mode 100644
index 0000000..f59d4c9
--- /dev/null
+++ b/frontend-old/node_modules/web-vitals/src/lib/onHidden.ts
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 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 onHidden = (cb: () => void) => {
+  document.addEventListener('visibilitychange', () => {
+    if (document.visibilityState === 'hidden') {
+      cb();
+    }
+  });
+};