hardhat.config.js

require("dotenv").config();

require("@nomiclabs/hardhat-etherscan");
require("@nomiclabs/hardhat-waffle");
require("hardhat-gas-reporter");
require("solidity-coverage");
require("hardhat-deploy");

const RINKEBY_RPC_URL = process.env.RINKEBY_RPC_URL;
const PRIVATE_KEY = process.env.PRIVATE_KEY;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY;

module.exports = {
  solidity: {
    compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
  },
  defaultNetwork: "hardhat",
  networks: {
    hardhat: {
      chainId: 31337,
      // gasPrice: 130000000000,
    },

    rinkeby: {
      url: RINKEBY_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 4,
      blockConfirmations: 6,
    },
  },

  etherscan: {
    apiKey: process.env.ETHERSCAN_API_KEY,
  },
  gasReporter: {
    enabled: false,
    currency: "USD",
    outputFile: "gas-report.txt",
    noColors: true,
    // coinmarketcap: COINMARKETCAP_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
    },
  },
};