Example of centralizing propTypes

propTypes.js

// You could centralize all your object shape definitions here
import PropTypes from 'prop-types';

export const Customer = PropTypes.shape({
  id: PropTypes.number,
  photo: PropTypes.string.isRequired,
  firstName: PropTypes.string.isRequired,
  middleName: PropTypes.string.isRequired,
  lastName: PropTypes.string.isRequired,
  isCompany: PropTypes.bool.isRequired,
  companyName: PropTypes.string,
  companyType: PropTypes.string,
  address: PropTypes.shape( {
    customerAddressId: PropTypes.number,
    street: PropTypes.string.isRequired,
    street2: PropTypes.string,
    city: PropTypes.string.isRequired,
    state: PropTypes.string.isRequired,
    postal: PropTypes.string.isRequired
  })
});