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Scenario:

  1. Token contract migration file
  2. Dapp contract migration file

I want to interact with the already deployed token contract in the dapp contract migration file.

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It's easy. Assuming you successfully deployed your token contract in a previous file (e.g. 2_migrate_token.js), here's a basic example for 3_deploy_dapp.js:

const ERC20 = artifacts.require("./ERC20.sol");

module.exports = async (deployer) => {
  let erc20Instance = await ERC20.deployed();
  // interact with the token contract
  return deployer.deploy(DappContract);
};

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