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1 files changed, 76 insertions, 0 deletions

diff --git a/frontend-old/node_modules/web-vitals/src/attribution/onFCP.ts b/frontend-old/node_modules/web-vitals/src/attribution/onFCP.ts
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+/*
+ * 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.
+ */
+
+import {getBFCacheRestoreTime} from '../lib/bfcache.js';
+import {getLoadState} from '../lib/getLoadState.js';
+import {getNavigationEntry} from '../lib/getNavigationEntry.js';
+import {onFCP as unattributedOnFCP} from '../onFCP.js';
+import {
+  FCPAttribution,
+  FCPMetric,
+  FCPMetricWithAttribution,
+  ReportOpts,
+} from '../types.js';
+
+const attributeFCP = (metric: FCPMetric): FCPMetricWithAttribution => {
+  // Use a default object if no other attribution has been set.
+  let attribution: FCPAttribution = {
+    timeToFirstByte: 0,
+    firstByteToFCP: metric.value,
+    loadState: getLoadState(getBFCacheRestoreTime()),
+  };
+
+  if (metric.entries.length) {
+    const navigationEntry = getNavigationEntry();
+    const fcpEntry = metric.entries[metric.entries.length - 1];
+
+    if (navigationEntry) {
+      const activationStart = navigationEntry.activationStart || 0;
+      const ttfb = Math.max(0, navigationEntry.responseStart - activationStart);
+
+      attribution = {
+        timeToFirstByte: ttfb,
+        firstByteToFCP: metric.value - ttfb,
+        loadState: getLoadState(metric.entries[0].startTime),
+        navigationEntry,
+        fcpEntry,
+      };
+    }
+  }
+
+  // Use Object.assign to set property to keep tsc happy.
+  const metricWithAttribution: FCPMetricWithAttribution = Object.assign(
+    metric,
+    {attribution},
+  );
+  return metricWithAttribution;
+};
+
+/**
+ * Calculates the [FCP](https://web.dev/articles/fcp) value for the current page and
+ * calls the `callback` function once the value is ready, along with the
+ * relevant `paint` performance entry used to determine the value. The reported
+ * value is a `DOMHighResTimeStamp`.
+ */
+export const onFCP = (
+  onReport: (metric: FCPMetricWithAttribution) => void,
+  opts?: ReportOpts,
+) => {
+  unattributedOnFCP((metric: FCPMetric) => {
+    const metricWithAttribution = attributeFCP(metric);
+    onReport(metricWithAttribution);
+  }, opts);
+};