hardhat.config.js

require('@nomiclabs/hardhat-waffle')
require('@nomiclabs/hardhat-etherscan')
require('hardhat-contract-sizer')
require('dotenv').config()
// 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: '0.8.4',
  settings: {
    optimizer: {
      enabled: true,
      runs: 200
    }
  },
  networks: {
    rinkeby: {
      url: process.env.STAGING_ALCHEMY_KEY,
      accounts: [process.env.PRIVATE_KEY],
    },
    goerli: {
      url: process.env.GOERLI_KEY,
      accounts: [process.env.PRIVATE_KEY],
    },
    mainnet: {
      chainId: 137,
      url: process.env.PROD_ALCHEMY_KEY,
      accounts: [process.env.PRIVATE_KEY]
    }
  },
  etherscan: {
    apiKey: {
      rinkeby: process.env.ETHERSCAN_API_KEY,
      goerli: process.env.ETHERSCAN_API_KEY,
      polygon: process.env.POLYGONSCAN_API_KEY
    }
  }
}