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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 { onBFCacheRestore } from './lib/bfcache.js';
-import { bindReporter } from './lib/bindReporter.js';
-import { initMetric } from './lib/initMetric.js';
-import { DEFAULT_DURATION_THRESHOLD, processInteractionEntry, estimateP98LongestInteraction, resetInteractions, } from './lib/interactions.js';
-import { observe } from './lib/observe.js';
-import { onHidden } from './lib/onHidden.js';
-import { initInteractionCountPolyfill } from './lib/polyfills/interactionCountPolyfill.js';
-import { whenActivated } from './lib/whenActivated.js';
-import { whenIdle } from './lib/whenIdle.js';
-/** Thresholds for INP. See https://web.dev/articles/inp#what_is_a_good_inp_score */
-export const INPThresholds = [200, 500];
-/**
- * Calculates the [INP](https://web.dev/articles/inp) value for the current
- * page and calls the `callback` function once the value is ready, along with
- * the `event` performance entries reported for that interaction. The reported
- * value is a `DOMHighResTimeStamp`.
- *
- * A custom `durationThreshold` configuration option can optionally be passed to
- * control what `event-timing` entries are considered for INP reporting. The
- * default threshold is `40`, which means INP scores of less than 40 are
- * reported as 0. Note that this will not affect your 75th percentile INP value
- * unless that value is also less than 40 (well below the recommended
- * [good](https://web.dev/articles/inp#what_is_a_good_inp_score) threshold).
- *
- * If the `reportAllChanges` configuration option is set to `true`, the
- * `callback` function will be called as soon as the value is initially
- * determined as well as any time the value changes throughout the page
- * lifespan.
- *
- * _**Important:** INP should be continually monitored for changes throughout
- * the entire lifespan of a page—including if the user returns to the page after
- * it's been hidden/backgrounded. However, since browsers often [will not fire
- * additional callbacks once the user has backgrounded a
- * page](https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden),
- * `callback` is always called when the page's visibility state changes to
- * hidden. As a result, the `callback` function might be called multiple times
- * during the same page load._
- */
-export const onINP = (onReport, opts) => {
- // Return if the browser doesn't support all APIs needed to measure INP.
- if (!('PerformanceEventTiming' in self &&
- 'interactionId' in PerformanceEventTiming.prototype)) {
- return;
- }
- // Set defaults
- opts = opts || {};
- whenActivated(() => {
- // TODO(philipwalton): remove once the polyfill is no longer needed.
- initInteractionCountPolyfill();
- let metric = initMetric('INP');
- let report;
- const handleEntries = (entries) => {
- // Queue the `handleEntries()` callback in the next idle task.
- // This is needed to increase the chances that all event entries that
- // occurred between the user interaction and the next paint
- // have been dispatched. Note: there is currently an experiment
- // running in Chrome (EventTimingKeypressAndCompositionInteractionId)
- // 123+ that if rolled out fully may make this no longer necessary.
- whenIdle(() => {
- entries.forEach(processInteractionEntry);
- const inp = estimateP98LongestInteraction();
- if (inp && inp.latency !== metric.value) {
- metric.value = inp.latency;
- metric.entries = inp.entries;
- report();
- }
- });
- };
- const po = observe('event', handleEntries, {
- // Event Timing entries have their durations rounded to the nearest 8ms,
- // so a duration of 40ms would be any event that spans 2.5 or more frames
- // at 60Hz. This threshold is chosen to strike a balance between usefulness
- // and performance. Running this callback for any interaction that spans
- // just one or two frames is likely not worth the insight that could be
- // gained.
- durationThreshold: opts.durationThreshold ?? DEFAULT_DURATION_THRESHOLD,
- });
- report = bindReporter(onReport, metric, INPThresholds, opts.reportAllChanges);
- if (po) {
- // Also observe entries of type `first-input`. This is useful in cases
- // where the first interaction is less than the `durationThreshold`.
- po.observe({ type: 'first-input', buffered: true });
- onHidden(() => {
- handleEntries(po.takeRecords());
- report(true);
- });
- // Only report after a bfcache restore if the `PerformanceObserver`
- // successfully registered.
- onBFCacheRestore(() => {
- resetInteractions();
- metric = initMetric('INP');
- report = bindReporter(onReport, metric, INPThresholds, opts.reportAllChanges);
- });
- }
- });
-};