How to use the bitcore-lib-cash.BlockHeader function in bitcore-lib-cash

function builder(options) {
  /* jshint maxstatements: 20 */
  /* jshint maxcomplexity: 10 */

  if (!options) {
    options = {};
  }

  if (!options.network) {
    options.network = bitcore.Networks.defaultNetwork;
  }

  options.Block = options.Block || bitcore.Block;
  options.BlockHeader = options.BlockHeader || bitcore.BlockHeader;
  options.Transaction = options.Transaction || bitcore.Transaction;
  options.MerkleBlock = options.MerkleBlock || bitcore.MerkleBlock;
  options.protocolVersion = options.protocolVersion || 70001;

  var exported = {
    constructors: {
      Block: options.Block,
      BlockHeader: options.BlockHeader,
      Transaction: options.Transaction,
      MerkleBlock: options.MerkleBlock
    },
    defaults: {
      protocolVersion: options.protocolVersion,
      network: options.network
    },
    inventoryCommands: [