docs/bundle.js
function validatePropTypes(element) {
  var componentClass = element.type;
  if (typeof componentClass !== 'function') {
    return;
  }
  var name = componentClass.displayName || componentClass.name;
  var propTypes = componentClass.propTypes;

  if (propTypes) {
    currentlyValidatingElement = element;
    checkPropTypes(propTypes, element.props, 'prop', name, getStackAddendum);
    currentlyValidatingElement = null;
  }
  if (typeof componentClass.getDefaultProps === 'function') {
    warning(componentClass.getDefaultProps.isReactClassApproved, 'getDefaultProps is only used on classic React.createClass ' + 'definitions. Use a static property named `defaultProps` instead.');
  }
}
function validatePropTypes(element) {
  var componentClass = element.type;
  if (typeof componentClass !== 'function') {
    return;
  }
  var name = componentClass.displayName || componentClass.name;
  var propTypes = componentClass.propTypes;

  if (propTypes) {
    currentlyValidatingElement = element;
    checkPropTypes(propTypes, element.props, 'prop', name, getStackAddendum);
    currentlyValidatingElement = null;
  }
  if (typeof componentClass.getDefaultProps === 'function') {
    warning(componentClass.getDefaultProps.isReactClassApproved, 'getDefaultProps is only used on classic React.createClass ' + 'definitions. Use a static property named `defaultProps` instead.');
  }
}
Given an element, validate that its props follow the propTypes definition,
provided by the type.

@param {ReactElement} element