CODE EXAMPLE FOR JAVASCRIPT

Hardhat config file multiple network

require('@nomiclabs/hardhat-waffle')
require('@nomiclabs/hardhat-etherscan')
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 = {
  defaultNetwork: 'rinkeby',
  solidity: {
    compilers: [
      {
        version: '0.8.1',
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
            details: {
              yul: false,
            },
          },
        },
      },
      {
        version: '0.8.0',
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
            details: {
              yul: false,
            },
          },
        },
      },
      {
        version: '0.4.17',
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
            details: {
              yul: false,
            },
          },
        },
      },
    ],
  },

  networks: {
    rinkeby: {
      url: process.env.STAGING_ALCHEMY_KEY,
      accounts: [process.env.PRIVATE_KEY],
    },
  },

  etherscan: {
    apiKey: '37NNWYXCSU7MAYFM3E9SVKP5KDQWHMVS3G',
  },

  mocha: {
    timeout: 100000000,
  },
}