src/options/vendor-prefix-align.js
function extraIndent(nodes) {
    if (!nodes || !nodes.length) return;

    var node;
    var crPos;
    var tabPos;
    var result = 0;

    for (var i = nodes.length; i--;) {
      node = nodes[i];

      if (!node.content) {
        crPos = -1;
      } else {
        crPos = node.content.lastIndexOf('\n');
        tabPos = node.content.lastIndexOf('\t');
        if (tabPos > crPos) crPos = tabPos;
      }

      if (crPos !== -1)
        oneline = false;

      if (node.is('space')) {
        result += node.content.length - crPos - 1;
        if (crPos !== -1)
          break;
      }
      if (node.is('multilineComment')) {
        if (crPos === -1) {
          // Comment symbols length
          let offset = 4;
          result += node.content.length + offset;
        } else {
          // Only last comment symbols length - 1 (not count \n)
          let offset = crPos - 1;
          result += node.content.length - offset;
          break;
        }
      }
    }

    return result;
  }
function extraIndent(nodes) {
    if (!nodes || !nodes.length) return;

    var node;
    var crPos;
    var tabPos;
    var result = 0;

    for (var i = nodes.length; i--;) {
      node = nodes[i];

      if (!node.content) {
        crPos = -1;
      } else {
        crPos = node.content.lastIndexOf('\n');
        tabPos = node.content.lastIndexOf('\t');
        if (tabPos > crPos) crPos = tabPos;
      }

      if (crPos !== -1)
        oneline = false;

      if (node.is('space')) {
        result += node.content.length - crPos - 1;
        if (crPos !== -1)
          break;
      }
      if (node.is('multilineComment')) {
        if (crPos === -1) {
          // Comment symbols length
          let offset = 4;
          result += node.content.length + offset;
        } else {
          // Only last comment symbols length - 1 (not count \n)
          let offset = crPos - 1;
          result += node.content.length - offset;
          break;
        }
      }
    }

    return result;
  }
Returns extra indent for item in arguments

@param {Array} nodes nodes to process
@returns {Number|undefined}