Code example for the article: "Why I got rid of getInitialProps on my work Next.js project"

auth-wrapper.js

export function authWrapper(next) {
  return async function auth(ctx) {
    const user = await session.getUser();

    if (!user) {
      return {
        redirect: {
          destination: '/sign-in',
          permanent: false,
        },
      };
    }

    const props = { user };

    return typeof next === 'function' ? next(ctx, props) : { props };
  };
}