Passing instance of Dictionary to generator() results in error about moniker HOT 2 OPEN

Generator.prototype.use = function(dict, opt) {
  var dicts = this.dicts;

  if (dict instanceof Dictionary)
    dicts.push(dict);
  else if (typeof dict == 'string')
    dicts.push((new Dictionary()).read(dict, opt));
  else if (typeof dict == 'function')
    dicts.push(dict(opt));
  else
    throw new Error('unrecognized dictionary type');

  return this;
};

var monikerNames = Moniker.generator(["./adjectives.txt", "./nouns.txt"]);