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next.js/client/on-demand-entries-client.js

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/* global location */
import Router from '../lib/router'
import fetch from 'unfetch'
export default () => {
Router.ready(() => {
Router.router.events.on('routeChangeComplete', ping)
})
async function ping () {
try {
const url = `/_next/on-demand-entries-ping?page=${Router.pathname}`
const res = await fetch(url, {
credentials: 'same-origin'
})
const payload = await res.json()
if (payload.invalid) {
// Payload can be invalid even if the page is not exists.
// So, we need to make sure it's exists before reloading.
const pageRes = await fetch(location.href, {
credentials: 'same-origin'
})
if (pageRes.status === 200) {
location.reload()
}
}
} catch (err) {
console.error(`Error with on-demand-entries-ping: ${err.message}`)
}
}
async function runPinger () {
while (true) {
await new Promise((resolve) => setTimeout(resolve, 5000))
await ping()
}
}
runPinger()
.catch((err) => {
console.error(err)
})
}