Created
March 22, 2024 07:07
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React hook for measuring Interaction to Next Pain (INP)
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| import { useEffect } from 'react' | |
| type PerformanceEntryEnhanced = PerformanceEntry & { | |
| interactionId?: string | |
| } | |
| let worstInp = 0 | |
| const useINPMonitor = () => { | |
| if ( | |
| typeof window === 'undefined' || | |
| !('PerformanceObserver' in window) || | |
| process.env.NODE_ENV !== 'development' | |
| ) { | |
| return null; | |
| } | |
| useEffect(() => { | |
| const observer = new PerformanceObserver((list) => { | |
| for (let entry of list.getEntries()) { | |
| if (!(entry as PerformanceEntryEnhanced)?.interactionId) continue | |
| worstInp = Math.max(entry.duration, worstInp) | |
| const entryInfo = { | |
| type: 'Interaction', | |
| event: entry.name, | |
| duration: entry.duration, | |
| worstInp, | |
| } | |
| // if (entryInfo.duration <= 40) continue | |
| if (entryInfo.duration >= 200) { | |
| console.warn(entryInfo) | |
| continue | |
| } | |
| console.info(entryInfo) | |
| } | |
| }) | |
| observer.observe({ | |
| type: 'event', | |
| durationThreshold: 0, // 16 minimum by spec | |
| buffered: true, | |
| } as AnyType) | |
| }, []) | |
| } | |
| export default useINPMonitor |
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