hardhat.config.js

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

// 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: {
    compilers: [
      {
        version: "0.5.16",
      },
      {
        version: '0.8.17',
        settings: {
          optimizer: {
            enabled: true,
            runs: 200
          }
        }
      },
    ]
  },
  defaultNetwork: 'rinkeby',
  networks: {
    hardhat: {},
    rinkeby: {
      url: `${process.env.RPC_URL}`,
      accounts: [`0x${process.env.METAMASK_PRIVATE_KEY}`]
    }
  },
  paths: {
    sources: './contracts',
    tests: './test',
    cache: './cache',
    artifacts: './artifacts'
  },
  mocha: {
    timeout: 40000
  },
  etherscan: {
    apiKey: `${process.env.ETHERSCAN_API_KEY}`
  }
}