You need to define propTypes as a static getter if you want it inside the class declaration:
static get propTypes() {
return {
children: PropTypes.any,
onClickOut: PropTypes.func
};
}
If you want to define it as an object, you need to define it outside the class, like this:
IxClickOut.propTypes = {
children: PropTypes.any,
onClickOut: PropTypes.func,
};
Also it's better if you import prop types from prop-types, not react, otherwise you'll see warnings in console (as preparation for React 16):
import PropTypes from 'prop-types';