In a React component, we can pass the properties from higher-level component, so knowledge of properties is a must, as it will give you more flexibility to extend your component and saves your time:

MyComponent.propTypes = { 
  isLoading: PropTypes.bool.isRequired,
  items: ImmutablePropTypes.listOf(
    ImmutablePropTypes.contains({
      name: PropTypes.string.isRequired,
    })
  ).isRequired
}

You can also validate your properties the way we can validate properties of Immutable JS with react immutable proptypes.