30 lines
752 B
JavaScript
30 lines
752 B
JavaScript
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/* global hydrationMetrics */
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export default onPerfEntry => {
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hydrationMetrics.onInputDelay((delay, event) => {
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const hydrationMeasures = performance.getEntriesByName(
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'Next.js-hydration',
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'measure'
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)
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if (hydrationMeasures.length > 0) {
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const { startTime, duration } = hydrationMeasures[0]
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const hydrateEnd = startTime + duration
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if (event.timeStamp > hydrateEnd) {
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onPerfEntry({
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name: 'first-input-delay-after-hydration',
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startTime: event.timeStamp,
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duration: delay,
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})
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} else {
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onPerfEntry({
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name: 'first-input-delay-before-hydration',
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startTime: event.timeStamp,
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duration: delay,
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})
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}
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}
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})
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}
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