next.js/test/e2e/basepath/pages/index.js

import { useRouter } from 'next/router'
import Link from 'next/link'
import { useState } from 'react'
import { useEffect } from 'react'

export const getStaticProps = () => {
  return {
    props: {
      nested: false,
      hello: 'hello',
    },
  }
}

export default function Index({ hello, nested }) {
  const { query, pathname, asPath } = useRouter()
  const [mounted, setMounted] = useState(false)
  useEffect(() => {
    setMounted(true)
    return () => setMounted(false)
  }, [])
  return (
    <>
      <h1 id="index-page">index page</h1>
      <p id="nested">{nested ? 'yes' : 'no'}</p>
      <p id="prop">{hello} world</p>
      <p id="query">{JSON.stringify(query)}</p>
      <p id="pathname">{pathname}</p>
      <p id="as-path">{mounted ? asPath : ''}</p>
      <Link href="/hello" id="hello-link">
        to /hello
      </Link>
    </>
  )
}