prop types is one of required code example

Example 1: how to make proptypes either or

size: PropTypes.oneOfType([
    PropTypes.number,
    PropTypes.oneOf([ 'SMALL', 'LARGE' ]),
]),

Example 2: react proptypes example

// proptypes using class component
Detaljer.PropTypes = {
  detaljer: PropTypes.string.isRequired,
  feilkode: PropTypes.string,
  removeEvent: PropTypes.string.isRequired
};

// proptypes using function component
Detaljer.propTypes = {
  detaljer: PropTypes.string.isRequired,
  feilkode: PropTypes.string,
  removeEvent: PropTypes.string.isRequired
};