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72 lines
3.2 KiB
72 lines
3.2 KiB
/*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { getLoadState } from '../lib/getLoadState.js';
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import { getSelector } from '../lib/getSelector.js';
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import { onINP as unattributedOnINP } from '../onINP.js';
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const attributeINP = (metric) => {
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if (metric.entries.length) {
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const longestEntry = metric.entries.sort((a, b) => {
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// Sort by: 1) duration (DESC), then 2) processing time (DESC)
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return (b.duration - a.duration ||
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b.processingEnd -
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b.processingStart -
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(a.processingEnd - a.processingStart));
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})[0];
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metric.attribution = {
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eventTarget: getSelector(longestEntry.target),
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eventType: longestEntry.name,
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eventTime: longestEntry.startTime,
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eventEntry: longestEntry,
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loadState: getLoadState(longestEntry.startTime),
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};
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return;
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}
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// Set an empty object if no other attribution has been set.
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metric.attribution = {};
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};
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/**
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* Calculates the [INP](https://web.dev/responsiveness/) value for the current
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* page and calls the `callback` function once the value is ready, along with
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* the `event` performance entries reported for that interaction. The reported
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* value is a `DOMHighResTimeStamp`.
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*
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* A custom `durationThreshold` configuration option can optionally be passed to
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* control what `event-timing` entries are considered for INP reporting. The
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* default threshold is `40`, which means INP scores of less than 40 are
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* reported as 0. Note that this will not affect your 75th percentile INP value
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* unless that value is also less than 40 (well below the recommended
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* [good](https://web.dev/inp/#what-is-a-good-inp-score) threshold).
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*
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* If the `reportAllChanges` configuration option is set to `true`, the
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* `callback` function will be called as soon as the value is initially
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* determined as well as any time the value changes throughout the page
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* lifespan.
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*
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* _**Important:** INP should be continually monitored for changes throughout
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* the entire lifespan of a page—including if the user returns to the page after
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* it's been hidden/backgrounded. However, since browsers often [will not fire
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* additional callbacks once the user has backgrounded a
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* page](https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden),
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* `callback` is always called when the page's visibility state changes to
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* hidden. As a result, the `callback` function might be called multiple times
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* during the same page load._
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*/
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export const onINP = (onReport, opts) => {
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unattributedOnINP(((metric) => {
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attributeINP(metric);
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onReport(metric);
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}), opts);
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};
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