contract.js

/*global ethereum, MetamaskOnboarding */

/*
The `piggybankContract` is compiled from:

  pragma solidity ^0.4.0;
  contract PiggyBank {

      uint private balance;
      address public owner;

      function PiggyBank() public {
          owner = msg.sender;
          balance = 0;
      }

      function deposit() public payable returns (uint) {
          balance += msg.value;
          return balance;
      }

      function withdraw(uint withdrawAmount) public returns (uint remainingBal) {
          require(msg.sender == owner);
          balance -= withdrawAmount;

          msg.sender.transfer(withdrawAmount);

          return balance;
      }
  }
*/

const forwarderOrigin = 'http://localhost:9010'

const initialize = () => {
  //You will start here 
}
window.addEventListener('DOMContentLoaded', initialize)