Allow using withAuthUser with the _app.tsx

[droganov]

Not sure if that's a miss-pattern, but it looks reasonable to have the ability to only call withAuthUser once in the app, and make user available to all pages.

Basically, it works, but the typings not OK.

the code:

const MyApp = ({ Component, pageProps }) => {
  return (
    <AuthScreen>
      <Component {...pageProps} />
    </AuthScreen>
  )
}
export default withAuthUser()(MyApp)

the TS error:

[kmjennison]

Duplicate of #64. This package probably won't support this in the near future, but here is an example of a way to achieve what you're looking for.