What is React proptype array with shape?

If you want to pass an array of objects to a component with a particular shape then use React.PropTypes.shape() as an argument to React.PropTypes.arrayOf().

ReactComponent.propTypes = {
  arrayWithShape: React.PropTypes.arrayOf(
    React.PropTypes.shape({
      color: React.PropTypes.string.isRequired,
      fontSize: React.PropTypes.number.isRequired,
    })
  ).isRequired,
};