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-/*
- * 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 { onBFCacheRestore } from './lib/bfcache.js';
-import { bindReporter } from './lib/bindReporter.js';
-import { doubleRAF } from './lib/doubleRAF.js';
-import { getActivationStart } from './lib/getActivationStart.js';
-import { getVisibilityWatcher } from './lib/getVisibilityWatcher.js';
-import { initMetric } from './lib/initMetric.js';
-import { observe } from './lib/observe.js';
-import { whenActivated } from './lib/whenActivated.js';
-/** Thresholds for FCP. See https://web.dev/articles/fcp#what_is_a_good_fcp_score */
-export const FCPThresholds = [1800, 3000];
-/**
- * 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, opts) => {
- // Set defaults
- opts = opts || {};
- whenActivated(() => {
- const visibilityWatcher = getVisibilityWatcher();
- let metric = initMetric('FCP');
- let report;
- const handleEntries = (entries) => {
- entries.forEach((entry) => {
- if (entry.name === 'first-contentful-paint') {
- po.disconnect();
- // Only report if the page wasn't hidden prior to the first paint.
- if (entry.startTime < visibilityWatcher.firstHiddenTime) {
- // The activationStart reference is used because FCP should be
- // relative to page activation rather than navigation start if the
- // page was prerendered. But in cases where `activationStart` occurs
- // after the FCP, this time should be clamped at 0.
- metric.value = Math.max(entry.startTime - getActivationStart(), 0);
- metric.entries.push(entry);
- report(true);
- }
- }
- });
- };
- const po = observe('paint', handleEntries);
- if (po) {
- report = bindReporter(onReport, metric, FCPThresholds, opts.reportAllChanges);
- // Only report after a bfcache restore if the `PerformanceObserver`
- // successfully registered or the `paint` entry exists.
- onBFCacheRestore((event) => {
- metric = initMetric('FCP');
- report = bindReporter(onReport, metric, FCPThresholds, opts.reportAllChanges);
- doubleRAF(() => {
- metric.value = performance.now() - event.timeStamp;
- report(true);
- });
- });
- }
- });
-};