title: React > Conditionally Check either one prop is available
body: <p>I am working with following code,</p>
  
  <pre><code>MessageDialog.propTypes = {
      message: React.PropTypes.string.isRequired,
      processedMessage: React.PropTypes.string.isRequired
  }
  </code></pre>
  
  <p>I want to know is there any way to set either message or processedMessage 
  "isRequired" where it will only searching for either one of the above two to be true at any time. </p>