How to use the elementType function from prop-types

Router.js

GitHub: Stremio/stremio-web

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    className: PropTypes.string,
    onPathNotMatch: PropTypes.func,
    viewsConfig: PropTypes.arrayOf(PropTypes.arrayOf(PropTypes.exact({
        regexp: PropTypes.instanceOf(RegExp).isRequired,
        urlParamsNames: PropTypes.arrayOf(PropTypes.string).isRequired,
        component: PropTypes.elementType.isRequired
    }))).isRequired
};

module.exports = Router;

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App.js

GitHub: BigRoomStudios/strangeluv

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module.exports.propTypes = {
    middleEnd: T.shape({
        store: T.object.isRequired
    }).isRequired,
    theme: T.object,
    Router: T.elementType
};

module.exports = HotLoader.hot(module.exports);

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+ 3 other calls in file