How to use the vega-scenegraph.bound function in vega-scenegraph

var dl = require('datalib'),
    df = require('vega-dataflow'),
    scene = require('vega-scenegraph'),
    Node = df.Node, // jshint ignore:line
    log = require('vega-logging'),
    bound = scene.bound,
    Bounds = scene.Bounds,
    Encoder = require('./Encoder');

function Bounder(graph, mark) {
  this._mark = mark;
  return Node.prototype.init.call(this, graph)
    .router(true)
    .reflows(true)
    .mutates(true);
}

var proto = (Bounder.prototype = new Node());

proto.evaluate = function(input) {
  log.debug(input, ['bounds', this._mark.marktype]);

var dl = require('datalib'),
    log = require('vega-logging'),
    df = require('vega-dataflow'),
    Node = df.Node, // jshint ignore:line
    Deps = df.Dependencies,
    bound = require('vega-scenegraph').bound;

var EMPTY = {};

function Encoder(graph, mark, builder) {
  var props  = mark.def.properties || {},
      enter  = props.enter,
      update = props.update,
      exit   = props.exit;

  Node.prototype.init.call(this, graph);

  this._mark = mark;
  this._builder = builder;
  var s = this._scales = [];

  // Only scales used in the 'update' property set are set as

var d3 = require('d3'),
    bound = require('vega-scenegraph').bound,
    Tuple = require('vega-dataflow').Tuple,
    Status = require('./Builder').STATUS;

function Transition(duration, ease) {
  this.duration = duration || 500;
  this.ease = ease && d3.ease(ease) || d3.ease('cubic-in-out');
  this.updates = {next: null};
}

var prototype = Transition.prototype;

var skip = {
  'text': 1,
  'url':  1
};