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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 {getLoadState} from '../lib/getLoadState.js';
-import {getSelector} from '../lib/getSelector.js';
-import {onFID as unattributedOnFID} from '../onFID.js';
-import {
- FIDAttribution,
- FIDMetric,
- FIDMetricWithAttribution,
- ReportOpts,
-} from '../types.js';
-
-const attributeFID = (metric: FIDMetric): FIDMetricWithAttribution => {
- const fidEntry = metric.entries[0];
- const attribution: FIDAttribution = {
- eventTarget: getSelector(fidEntry.target),
- eventType: fidEntry.name,
- eventTime: fidEntry.startTime,
- eventEntry: fidEntry,
- loadState: getLoadState(fidEntry.startTime),
- };
-
- // Use Object.assign to set property to keep tsc happy.
- const metricWithAttribution: FIDMetricWithAttribution = Object.assign(
- metric,
- {attribution},
- );
- return metricWithAttribution;
-};
-
-/**
- * Calculates the [FID](https://web.dev/articles/fid) value for the current page and
- * calls the `callback` function once the value is ready, along with the
- * relevant `first-input` performance entry used to determine the value. The
- * reported value is a `DOMHighResTimeStamp`.
- *
- * _**Important:** since FID is only reported after the user interacts with the
- * page, it's possible that it will not be reported for some page loads._
- */
-export const onFID = (
- onReport: (metric: FIDMetricWithAttribution) => void,
- opts?: ReportOpts,
-) => {
- unattributedOnFID((metric: FIDMetric) => {
- const metricWithAttribution = attributeFID(metric);
- onReport(metricWithAttribution);
- }, opts);
-};