module.exports = function(classname) {
    if (typeof classname === 'string') {
        return classname;
    }
    if (Array.isArray(classname)) {
        return classname.join(' ');
    }
    if (typeof classname === 'object') {
        return Object.keys(classname).filter(key => !!classname[key]).join(' ');
    }
    throw new Error('Cannot process class name' + JSON.stringify(classname));
};