klz-cables.com/.pnpm-store/v10/files/0b/d3a73bf4ad652064916ca3b86693fcf5f3171d4309ed4a76f698eb9d5386da6b4bbefb9b86ad245e3227e5fb1f85b3e14e9b7708651f6fd7b0afd5bdcd03d9

import { bindReporter } from './lib/bindReporter.js';
import { getVisibilityWatcher } from './lib/getVisibilityWatcher.js';
import { initMetric } from './lib/initMetric.js';
import { initUnique } from './lib/initUnique.js';
import { InteractionManager } from './lib/InteractionManager.js';
import { observe } from './lib/observe.js';
import { initInteractionCountPolyfill } from './lib/polyfills/interactionCountPolyfill.js';
import { whenActivated } from './lib/whenActivated.js';
import { whenIdleOrHidden } from './lib/whenIdleOrHidden.js';

/*
 * 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.
 */


/** Thresholds for INP. See https://web.dev/articles/inp#what_is_a_good_inp_score */
const INPThresholds = [200, 500];

// The default `durationThreshold` used across this library for observing
// `event` entries via PerformanceObserver.
const DEFAULT_DURATION_THRESHOLD = 40;

/**
 * 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 will not
 * be reported. To avoid reporting no interactions in these cases, the library
 * will fall back to the input delay of the first interaction. 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._
 */
const onINP = (onReport, opts = {}) => {
  // Return if the browser doesn't support all APIs needed to measure INP.
  if (!(globalThis.PerformanceEventTiming && 'interactionId' in PerformanceEventTiming.prototype)) {
    return;
  }

  const visibilityWatcher = getVisibilityWatcher();

  whenActivated(() => {
    // TODO(philipwalton): remove once the polyfill is no longer needed.
    initInteractionCountPolyfill();

    const metric = initMetric('INP');
    // eslint-disable-next-line prefer-const
    let report;

    const interactionManager = initUnique(opts, InteractionManager);

    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.
      whenIdleOrHidden(() => {
        for (const entry of entries) {
          interactionManager._processEntry(entry);
        }

        const inp = interactionManager._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 });

      visibilityWatcher.onHidden(() => {
        handleEntries(po.takeRecords() );
        report(true);
      });
    }
  });
};

export { INPThresholds, onINP };
//# sourceMappingURL=getINP.js.map