docs: function validateProp(propValue, validArr, responsive = true) {
    const strArr = propValue.split(' ');
    return strArr.every((mod) => {
      const modValid = validArr.some((validStr) => {
        if (responsive) {
          return (
            mod === validStr
            || mod === `${validStr}@xs`
            || mod === `${validStr}@sm`
            || mod === `${validStr}@md`
            || mod === `${validStr}@lg`
          );
        }
  
        return (mod === validStr);
      });
      if (!modValid) {
        console.error(`Invalid prop value: ${mod}`); // eslint-disable-line no-console
      }
      return modValid;
    });
  }