How to use the react-overlays.Portal function in react-overlays

const mapType = require('../../map/enhancers/mapType');
const autoResize = require('../../map/enhancers/autoResize');
const onMapViewChanges = require('../../map/enhancers/onMapViewChanges');
const withDraw = require("../../map/enhancers/withDraw");
const {compose} = require('recompose');

const MapWitDraw = compose(
    enhancer,
    onMapViewChanges,
    autoResize(0),
    autoMapType,
    mapType,
    withDraw()
)(require('../../map/BaseMap'));

const Portal = require('react-overlays').Portal;

module.exports = ({layer, onMapReady = () => {}}) => {
    return (
        
            <div style="{{position:">
                
            </div>
        );
};