ReactjsのsetState()のsynchronousな代替はあるか？

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
     x: 1
    };
    
    console.log('initial state', this.state);
  }
  
  updateState = () => {
   console.log('changing state');
    this.setState({
      x: 2
    },() => { console.log('new state', this.state); })
  }
  
  render() {
    return (
      <div>
      <button onClick={this.updateState}>Change state</button>
    </div>
    );
   
  }
}

ReactDOM.render(
  <MyComponent />,
  document.getElementById("react")
);

<div id="react"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>