old_contents: // @flow
  import { browserHistory } from 'react-router';
  import config from 'config';
  
  export const push = (to: string) => browserHistory.push(config.getUrl + to);
  export const getUrl = (to: string) => `${config.getUrl}${to}`;
  
  export default {
    push,
    getUrl,
  };
  
new_contents: // @flow
  import { browserHistory } from 'react-router';
  import config from 'config';
  
  export const push = (to: string) => browserHistory.push(config.urlPrefix + to);
  export const getUrl = (to: string) => `${config.urlPrefix}${to}`;
  
  export default {
    push,
    getUrl,
  };
  
subject: fix undefined route (#136)