code: function spacingTransform({
    className,
    ma, mt, ml, mr, mb, mv, mh,
    pa, pt, pl, pr, pb, pv, ph,
    na, nt, nl, nr, nb,
    ...ownerProps
  }) {
    const margins = classesFor({ ma, mt, ml, mr, mb, mv, mh });
    const negativeMargins = classesFor({ na, nt, nl, nr, nb });
    const paddings = classesFor({ pa, pt, pl, pr, pb, pv, ph });
  
    return R.merge(
      { className: cx([margins, negativeMargins, paddings, className]) },
      ownerProps,
    );
  }
docs: withSpacing HOC