hardhat.config.js

require('dotenv').config()
require('@nomiclabs/hardhat-waffle')
require('@nomiclabs/hardhat-etherscan')
require('hardhat-gas-reporter')

const { ETH_PRIVATE_KEY, ETHERSCAN_API_KEY, COIN_MARKETCAP_API_KEY, ETH_MAINNET_PRIVATE_KEY } = process.env

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task('accounts', 'Prints the list of accounts', async (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners()

  for (const account of accounts) {
    console.log(account.address)
  }
})

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: {
    version: '0.8.4',
    settings: {
      optimizer: {
        enabled: true,
        runs: 1000,
      },
    },
  },
  paths: {
    artifacts: './artifacts',
  },
  networks: {
    hardhat: {
      chainId: 1337,
    },
    gasReporter: {
      currency: 'USD',
      coinmarketcap: COIN_MARKETCAP_API_KEY,
      url: 'https://eth-mainnet.alchemyapi.io/v2/GBjvplStTQ2x1FiAa5-5Qdyv2_8ZBuwe',
    },
    kovan: {
      url: 'https://eth-kovan.alchemyapi.io/v2/dDjDNS9wsS9k_FduOZXloJRG6INUMovF',
      accounts: [`0x${ETH_PRIVATE_KEY}`],
    },
    mainnet: {
      url: 'https://eth-mainnet.alchemyapi.io/v2/GBjvplStTQ2x1FiAa5-5Qdyv2_8ZBuwe',
      accounts: [`0x${ETH_MAINNET_PRIVATE_KEY}`],
    },
  },
  etherscan: { apiKey: ETHERSCAN_API_KEY },
}