/Javascript/React/Document not intialized react js

Document not intialized react js

import React from 'react';
import ReactDOM from 'react-dom';

var MainWrapper = React.createClass ({
    render: function() {
        return (
            <button>go</button>
        )
    }
});

React.render(<MainWrapper />, document.getElementById("root"));

Source: stackoverflow.com

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