hardhat.config.js

require("@nomicfoundation/hardhat-toolbox")
require("hardhat-deploy")
require("dotenv").config()

const RINKEBY_RPC_URL = process.env.RINKEBY_RPC_URL || "https://eth-rinkeby"
const PRIVATE_KEY = process.env.PRIVATE_KEY || "0xkey"
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || "key"
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || "key"
/** @type import('hardhat/config').HardhatUserConfig */

module.exports = {
  solidity: {
    compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
  },
  defaultNetwork: "hardhat",
  networks: {
    rinkeby: {
      url: RINKEBY_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 4,
      blockConfirmations: 6,
    },
    localhost: {
      url: "http://127.0.0.1:8545/",
      chainId: 31337,
    },
  },
  etherscan: {
    apiKey: ETHERSCAN_API_KEY,
  },
  gasReporter: {
    enabled: true,
    outputFile: "gas-report.txt",
    noColors: true,
    currency: "USD",
    // coinmarketcap: COINMARKETCAP_API_KEY,
    token: "MATIC",
  },

  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
    },
  },
}