hardhat.config.js

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
require("@nomiclabs/hardhat-waffle");
require("@nomiclabs/hardhat-ethers");
require("@nomiclabs/hardhat-truffle5");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-deploy");

require("dotenv").config();

const MAINNET_RPC_URL = process.env.MAINNET_RPC_URL;
const RINKEBY_RPC_URL = process.env.RINKEBY_RPC_URL;
const MNEMONIC = process.env.MNEMONIC;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;

module.exports = {
  defaultNetwork: "rinkeby",
  networks: {
    hardhat: {
      forking: {
        url: MAINNET_RPC_URL,
        accounts: {
          mnemonic: MNEMONIC,
        },
        saveDeployments: true,
      },
    },
    rinkeby: {
      url: RINKEBY_RPC_URL,
      accounts: {
        mnemonic: MNEMONIC,
      },
      saveDeployments: true,
    },
  },
  solidity: {
    version: "0.8.7",
    settings: {
      optimizer: {
        enabled: true,
        runs: 200,
      },
    },
  },
  etherscan: {
    // Your API key for Etherscan
    // Obtain one at https://etherscan.io/
    apiKey: ETHERSCAN_API_KEY,
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
      1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
    },
    feeCollector: {
      default: 1,
    },
  },
  paths: {
    sources: "./contracts",
    tests: "./test",
    cache: "./cache",
    artifacts: "./artifacts",
  },
  mocha: {
    timeout: 20000,
  },
};