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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 { onHidden } from './lib/onHidden.js';
-import { runOnce } from './lib/runOnce.js';
-import { whenActivated } from './lib/whenActivated.js';
-import { whenIdle } from './lib/whenIdle.js';
-/** Thresholds for LCP. See https://web.dev/articles/lcp#what_is_a_good_lcp_score */
-export const LCPThresholds = [2500, 4000];
-const reportedMetricIDs = {};
-/**
- * Calculates the [LCP](https://web.dev/articles/lcp) value for the current page and
- * calls the `callback` function once the value is ready (along with the
- * relevant `largest-contentful-paint` performance entry used to determine the
- * value). The reported value is a `DOMHighResTimeStamp`.
- *
- * If the `reportAllChanges` configuration option is set to `true`, the
- * `callback` function will be called any time a new `largest-contentful-paint`
- * performance entry is dispatched, or once the final value of the metric has
- * been determined.
- */
-export const onLCP = (onReport, opts) => {
- // Set defaults
- opts = opts || {};
- whenActivated(() => {
- const visibilityWatcher = getVisibilityWatcher();
- let metric = initMetric('LCP');
- let report;
- const handleEntries = (entries) => {
- // If reportAllChanges is set then call this function for each entry,
- // otherwise only consider the last one.
- if (!opts.reportAllChanges) {
- entries = entries.slice(-1);
- }
- entries.forEach((entry) => {
- // Only report if the page wasn't hidden prior to LCP.
- if (entry.startTime < visibilityWatcher.firstHiddenTime) {
- // The startTime attribute returns the value of the renderTime if it is
- // not 0, and the value of the loadTime otherwise. The activationStart
- // reference is used because LCP should be relative to page activation
- // rather than navigation start if the page was prerendered. But in cases
- // where `activationStart` occurs after the LCP, this time should be
- // clamped at 0.
- metric.value = Math.max(entry.startTime - getActivationStart(), 0);
- metric.entries = [entry];
- report();
- }
- });
- };
- const po = observe('largest-contentful-paint', handleEntries);
- if (po) {
- report = bindReporter(onReport, metric, LCPThresholds, opts.reportAllChanges);
- const stopListening = runOnce(() => {
- if (!reportedMetricIDs[metric.id]) {
- handleEntries(po.takeRecords());
- po.disconnect();
- reportedMetricIDs[metric.id] = true;
- report(true);
- }
- });
- // Stop listening after input. Note: while scrolling is an input that
- // stops LCP observation, it's unreliable since it can be programmatically
- // generated. See: https://github.com/GoogleChrome/web-vitals/issues/75
- ['keydown', 'click'].forEach((type) => {
- // Wrap in a setTimeout so the callback is run in a separate task
- // to avoid extending the keyboard/click handler to reduce INP impact
- // https://github.com/GoogleChrome/web-vitals/issues/383
- addEventListener(type, () => whenIdle(stopListening), {
- once: true,
- capture: true,
- });
- });
- onHidden(stopListening);
- // Only report after a bfcache restore if the `PerformanceObserver`
- // successfully registered.
- onBFCacheRestore((event) => {
- metric = initMetric('LCP');
- report = bindReporter(onReport, metric, LCPThresholds, opts.reportAllChanges);
- doubleRAF(() => {
- metric.value = performance.now() - event.timeStamp;
- reportedMetricIDs[metric.id] = true;
- report(true);
- });
- });
- }
- });
-};