Initial state in React Before ES6

App.js

const React = require( 'react' );
const CreateReactClass = require( 'create-react-class' );

const App = CreateReactClass( {
    getInitialState() {
        return {
            message: 'world'
        }
    },
    render() {
        return React.createElement( 'h1', null, `Hello ${this.state.message}` );
    }
} )

export default App;