ES6, React - how to set class name in dynamically generated class? [duplicate]

I have a builder method which wraps a class with injected props and I would like to set class name the same as the wrapped class. how do I achieve this? (just ignore the flow typing if you want)

const buildComponentWithInjectedProps =
  (SubjectClass, injectedProps) => {
    return class extends React.PureComponent {
      /*set classname=name of SubjectClass*/
      render() {
        return (<SubjectClass {...injectedProps} {...this.props} />);
      }
    };
  };