1 files changed, 57 insertions, 0 deletions
diff --git a/frontend-old/node_modules/web-vitals/src/lib/initMetric.ts b/frontend-old/node_modules/web-vitals/src/lib/initMetric.ts
new file mode 100644
index 0000000..90618d8
--- /dev/null
+++ b/frontend-old/node_modules/web-vitals/src/lib/initMetric.ts
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+
+import {getBFCacheRestoreTime} from './bfcache.js';
+import {generateUniqueID} from './generateUniqueID.js';
+import {getActivationStart} from './getActivationStart.js';
+import {getNavigationEntry} from './getNavigationEntry.js';
+import {MetricType} from '../types.js';
+
+export const initMetric = <MetricName extends MetricType['name']>(
+  name: MetricName,
+  value?: number,
+) => {
+  const navEntry = getNavigationEntry();
+  let navigationType: MetricType['navigationType'] = 'navigate';
+
+  if (getBFCacheRestoreTime() >= 0) {
+    navigationType = 'back-forward-cache';
+  } else if (navEntry) {
+    if (document.prerendering || getActivationStart() > 0) {
+      navigationType = 'prerender';
+    } else if (document.wasDiscarded) {
+      navigationType = 'restore';
+    } else if (navEntry.type) {
+      navigationType = navEntry.type.replace(
+        /_/g,
+        '-',
+      ) as MetricType['navigationType'];
+    }
+  }
+
+  // Use `entries` type specific for the metric.
+  const entries: Extract<MetricType, {name: MetricName}>['entries'] = [];
+
+  return {
+    name,
+    value: typeof value === 'undefined' ? -1 : value,
+    rating: 'good' as const, // If needed, will be updated when reported. `const` to keep the type from widening to `string`.
+    delta: 0,
+    entries,
+    id: generateUniqueID(),
+    navigationType,
+  };
+};