next.js/examples/with-apollo-auth/pages/create-account.js

import React from 'react'
import Link from 'next/link'

import redirect from '../lib/redirect'
import checkLoggedIn from '../lib/checkLoggedIn'

import RegisterBox from '../components/RegisterBox'

export default class CreateAccount extends React.Component {
  static async getInitialProps (context) {
    const { loggedInUser } = await checkLoggedIn(context.apolloClient)

    if (loggedInUser.user) {
      // Already signed in? No need to continue.
      // Throw them back to the main page
      redirect(context, '/')
    }

    return {}
  }

  render () {
    return (
      <React.Fragment>
        {/* RegisterBox handles all register logic. */}
        <RegisterBox />
        <hr />
        Already have an account?{' '}
        <Link prefetch href='/signin'>
          <a>Sign in</a>
        </Link>
      </React.Fragment>
    )
  }
}