next.js getInitialProps refactoring problem

next_getInitialProps_refactoring_1.js

class SomePage extends React.Component {
  static async getInitialProps(args) {
    return {
      ua: args.req ? args.req.headers['user-agent'] : navigator.userAgent,
      lang args.req.query.language,
      foo: 'bar',
      /* and so on.. */
    }
  }
  /* Rest of Page*/
}