Gmaps Center on Resize

demo.js

import React from 'react';
import {Gmaps} from 'react-gmaps';

const coords = {
  lat: 51.5258541,
  lng: -0.08040660000006028
};

const App = React.createClass({

  onMapCreated() {
    const {Gmaps} = this.refs;
    google.maps.event.addDomListener(window, 'resize', function() {
      Gmaps.getMap().setCenter(coords);
    });
  },

  render() {
    return (
      <Gmaps
        ref='Gmaps'
        width={'100%'}
        height={'100%'}
        lat={coords.lat}
        lng={coords.lng}
        zoom={12}
        onMapCreated={this.onMapCreated} />
    );
  }

});

React.render(<App />, document.getElementById('gmaps'));

Where is that google variable on line 13 coming from?

It seems Google Maps is polluting global namespace.