const MyPage = () => {
  return <div></div>;
};

MyPage.getInitialProps = (nextContext) => {
  const { pathname, query } = nextContext;
  
  // `pathname` should be `index`, i.e. the `destination` property in our route matcher definitions.
  console.log('pathname', pathname);
  // `query.routeName` should be `/some-rad-page`, i.e. the `:routeName` parameter matched in our route matcher definitions.
  console.log('query.routeName', query.routeName);
  
}