ListItemLink.jsx

// https://github.com/ReactTraining/react-router/blob/master/packages/react-router/docs/api/Route.md#children-func

const ListItemLink = ({ to, ...rest }) => (
  <Route path={to}>
    {({match}) => (
      <li className={match ? "active" : ""}>
        <Link to={to} {...rest} />
      </li>
    )}
  </Route>
);