d1.js

var entities = {
  address: 1, 
  block: 2, 
  transaction: 3,  
};
entities.humanize = function (id) {
  switch (id) {
    case 1:
      return 'address';      
    case 2:
      return 'block';      
    case 3:
      return 'transaction';      
   }
};
export default entities;

d2.js

var address = 1;
address.humanize = function () {return 'btcAddress';}

var block = 1;
block.humanize = function () {return 'btcBlock';}

var transaction = 1;
transaction.humanize = function () {return 'btcTransaction';}

export default {
  address: address, 
  block: block, 
  transaction: transaction,  
};