stylelint-bundle-worker.js
function(n) {
    return this.stack.length > 0
      ? utils.last(this.stack, n)
      : utils.last(this.nodes, n);
  }
function(n) {
    return this.stack.length > 0
      ? utils.last(this.stack, n)
      : utils.last(this.nodes, n);
  }
Get the previous AST node
@return {Object}