code: function getRange(node) {
      if (isScope(node)) {
          return node.nodes
              .map(getRange)
              .reduce(reduceRanges);
      } else if (node.type === 'rule') {
          return specificity.calculate(node.selector)
              .map(result => {
                  return result.specificity.split(',').map(v => Number(v));
              })
              .reduce(reduceRange, Object.assign({}, DEFAULT_RANGE));
      }
      return null;
  }
docs: Get specificity range of a style rule or a scope