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import { useEffect } from 'react'
import { useRouter } from 'next/router'
// We use session storage for the event log so that it will survive
// page reloads, which happen for instance during routeChangeError
const EVENT_LOG_KEY = 'router-event-log'
function getEventLog() {
const data = sessionStorage.getItem(EVENT_LOG_KEY)
return data ? JSON.parse(data) : []
}
function clearEventLog() {
sessionStorage.removeItem(EVENT_LOG_KEY)
}
function addEvent(data) {
const eventLog = getEventLog()
eventLog.push(data)
sessionStorage.setItem(EVENT_LOG_KEY, JSON.stringify(eventLog))
}
if (typeof window !== 'undefined') {
// global functions introduced to interface with the test infrastructure
window._clearEventLog = clearEventLog
window._getEventLog = getEventLog
}
function useLoggedEvent(event, serializeArgs = (...args) => args) {
const router = useRouter()
useEffect(() => {
const logEvent = (...args) => {
addEvent([event, ...serializeArgs(...args)])
}
router.events.on(event, logEvent)
return () => router.events.off(event, logEvent)
}, [event, router.events, serializeArgs])
}
function serializeErrorEventArgs(err, url, properties) {
return [err.message, err.cancelled, url, properties]
}
export default function MyApp({ Component, pageProps }) {
useLoggedEvent('routeChangeStart')
useLoggedEvent('routeChangeComplete')
useLoggedEvent('routeChangeError', serializeErrorEventArgs)
useLoggedEvent('beforeHistoryChange')
useLoggedEvent('hashChangeStart')
useLoggedEvent('hashChangeComplete')
return <Component {...pageProps} />
}
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