Carousel offset margin.js

getChildOffset = (item, isVertical) => {
  isVertical = isVertical || false;
  let nodeStyle = window.getComputedStyle(item);
  if (isVertical) {
    let marginTop = parseInt(nodeStyle.getPropertyValue('margin-top'), 10);
    let marginBottom = parseInt(nodeStyle.getPropertyValue('margin-bottom'), 10);
    return marginTop + marginBottom;
  } else {
    let marginRight = parseInt(nodeStyle.getPropertyValue('margin-right'), 10);
    let marginLeft = parseInt(nodeStyle.getPropertyValue('margin-left'), 10);
    return marginRight + marginLeft;
  }
}