text: export default function cssClassListToString() {
    const classes = [];
  
    for(let i = 0, l = arguments.length; i < l; i++) {
      if(arguments[i]) {
        if(arguments[i] instanceof Array) {
          let nestedClasses = classListToString.apply(null, arguments[i]);
  
          if(nestedClasses) {
            classes.push(nestedClasses);
          }
        } else {
          classes.push(arguments[i].toString());
        }
      }
    }
  
    return classes.join(' ');
  }
  