web-vitals
Version:
Easily measure performance metrics in JavaScript
39 lines • 1.63 kB
JavaScript
/*
* Copyright 2023 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.
*/
export const checkSoftNavsEnabled = (opts) => {
return (PerformanceObserver.supportedEntryTypes.includes('soft-navigation') &&
// Older implementations expose the value as an attribute rather than the
// method. We only support the newer method as that was what was launched
// to stable unflagged.
typeof globalThis.PerformanceSoftNavigation?.prototype
?.getLargestInteractionContentfulPaint === 'function' &&
opts &&
opts.reportSoftNavs);
};
// Stores a soft navigation entry keyed by its navigationId, keeping only
// the 2 most recent entries so the map cannot grow unbounded.
export const storeSoftNavEntry = (map, entry) => {
map.set(entry.navigationId, entry);
// Clean up older entries to prevent memory leaks, keeping only
// the 2 most recent entries.
if (map.size > 2) {
const firstKey = map.keys().next().value;
if (firstKey !== undefined) {
map.delete(firstKey);
}
}
};
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