hyperapp-components/src/hocs/appendClassName.js

import cx from 'classnames';

function addClassNameToNode (node, addedClassName) {
    const {attributes} = node;
    const {className} = attributes;

    return {
        ...node,
        attributes: {
            ...attributes,
            className: cx(className, addedClassName)
        }
    };
}

function appendClassName (component) {
    return function ({className, ...props}, children) {
        const rendered = component(props, children);

        // handle lazy component
        if (typeof rendered === 'function') {
            return function (state, actions) {
                return addClassNameToNode(
                    rendered(state, actions),
                    className
                );
            };
        }

        return addClassNameToNode(rendered, className);
    };
}

export {
    appendClassName
};