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50 lines
1.7 KiB
50 lines
1.7 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 { observe } from '../observe.js';
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let interactionCountEstimate = 0;
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let minKnownInteractionId = Infinity;
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let maxKnownInteractionId = 0;
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const updateEstimate = (entries) => {
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entries.forEach((e) => {
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if (e.interactionId) {
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minKnownInteractionId = Math.min(minKnownInteractionId, e.interactionId);
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maxKnownInteractionId = Math.max(maxKnownInteractionId, e.interactionId);
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interactionCountEstimate = maxKnownInteractionId
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? (maxKnownInteractionId - minKnownInteractionId) / 7 + 1
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: 0;
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}
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});
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};
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let po;
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/**
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* Returns the `interactionCount` value using the native API (if available)
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* or the polyfill estimate in this module.
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*/
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export const getInteractionCount = () => {
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return po ? interactionCountEstimate : performance.interactionCount || 0;
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};
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/**
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* Feature detects native support or initializes the polyfill if needed.
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*/
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export const initInteractionCountPolyfill = () => {
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if ('interactionCount' in performance || po)
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return;
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po = observe('event', updateEstimate, {
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type: 'event',
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buffered: true,
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durationThreshold: 0,
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});
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};
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