Investing in a Fund

import BigNumber from 'bignumber.js';
import { ERC20WithFields, Hub, Participation } from '@melonproject/melonjs';
​
// your hub address
const hubAddress = '0x05263237f43190ce0e93b48afb25dd60a03ad3c5';
​
// declare an instance of the fund's hub to access the spoke contract addresses
const hub = new Hub(environment, hubAddress);
​
// the address of the user trying to make the investment
const investorAddress = '0x4aaf7d8a61b5d4531961a3d40b677735e45ab774'; 
​
// the address of the fund's participation contract
const participationAddress = hub.getRoutes().participation;
​
// fetch the token information for the WETH token.
const tokenInfo = environment.getToken('WETH');
​
// create the token contract instance for WETH.
const token = new ERC20WithFields(environment, tokenInfo.address);
​
// the amount of ERC20 token the user is offering to invest in WEI
const investmentAmount = new BigNumber(1).multipliedBy('1e18');
​
// the computed number of shares the user wishes to purchase in WEI
const sharesAmount = new BigNumber(1).multipliedBy('1e18');
​
// specify the gas price (refer to http://ethgasstation.info/).
const gasPrice = 30000000000; 
​
// declare an instance of the fund's participation contract
const participation = new Participation(environment, participationAddress);
​
{
  // execute the approveInvestment step
  const transaction = token.approve(
    investorAddress,
    participationAddress, 
    investmentAmount
  );
  const opts = await transaction.prepare({gasPrice});
  const receipt = await transaction.send(opts);
}
​
{
  // execute the requestInvestment step
  const transaction = participation.requestInvestment(
    investorAddress,
    sharesAmount, 
    investmentAmount, 
    tokenAddress
  );
  const opts = await transaction.prepare({gasPrice});
  const receipt = await transaction.send(opts);
}
​
{  
  // execute the executeInvestment step
  const transaction = participation.executeRequestFor(investorAddress,investorAddress);
  const opts = await transaction.prepare({gasPrice});
  const receipt = await transaction.send(opts);
}