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66 lines
1.8 KiB
JavaScript
66 lines
1.8 KiB
JavaScript
import React from 'react'
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function userTiming({ category, status, value }) {
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try {
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window.gtag('event', status, {
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event_category: 'Performance',
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event_label: category,
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value
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})
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} catch (err) {
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// pass
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}
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}
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export function usePerformanceMeasurement() {
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React.useEffect(() => {
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try {
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if (window.performance && window.performance.getEntriesByType) {
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window.performance.getEntriesByType('paint').forEach(entry => {
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userTiming({
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category: 'paint',
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status: entry.name,
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value: entry.startTime
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})
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})
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const navigationTiming = window.performance.getEntriesByType('navigation')
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? window.performance.getEntriesByType('navigation')[0]
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: null
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if (navigationTiming) {
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userTiming({
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category: 'paint',
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status: 'time to first byte',
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value: navigationTiming.responseEnd - navigationTiming.requestStart
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})
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}
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const javascriptFiles = performance.getEntries().filter(resource => {
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return resource.name.startsWith(`${location.origin}/_next/static`)
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})
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/*
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* Tracks total number of javascript used,
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* helps in tracking the effect of granular chunks work
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*/
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userTiming({
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category: 'javascript',
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status: 'script count',
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value: javascriptFiles.length
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})
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/*
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* Tracks total size of javascript used,
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* helps in tracking the effect of modern/nomodern work
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*/
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userTiming({
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category: 'javascript',
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status: 'script size',
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value: javascriptFiles.reduce((sum, script) => script.encodedBodySize + sum, 0)
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})
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}
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} catch (error) {
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console.error(error)
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}
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}, [])
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}
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