Memory Leak

demo.js

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

let interval;

const App = React.createClass({

  getInitialState() {
    return {
      count: 0
    };
  },

  handleStart() {
    interval = setInterval(() => {
      this.setState({
        count: this.state.count + 1
      });
    }, 100);
  },

  handleStop() {
    clearInterval(interval);
  },

  render() {
    return (
      <div>
        <button onClick={this.handleStop}>
          Stop
        </button>
        <button onClick={this.handleStart}>
          Start
        </button>
        <div>{this.state.count}</div>
        {interval &&
          <Gmaps
            key={this.state.count}
            width="200px"
            height="200px"
            lat={-34.397}
            lng={150.644}
            zoom={8} />
        }
      </div>
    );
  }

});

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