hardhat.config.js

// hardhat.config.js
require("@nomiclabs/hardhat-ethers");
require("@openzeppelin/hardhat-upgrades");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-contract-sizer");
require("@openzeppelin/hardhat-defender");
require("dotenv").config();

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: {
    compilers: [
      {
        version: "0.5.12",
        settings: {
          optimizer: {
            enabled: true,
            runs: 1,
          },
        },
      },
      {
        version: "0.8.6",
        settings: {
          metadata: {
            bytecodeHash: "none",
          },
          optimizer: {
            enabled: true,
            runs: 0,
          },
        },
      },
    ],
  },

  networks: {
    georli: {
      url: process.env.GEORLI_URL,
      accounts: [process.env.PRIVATE_KEY],
    },
    mumbai: {
      url: process.env.MUMBAI_URL,
      accounts: [process.env.PRIVATE_KEY],
    },
    hardhat: {
      // forking: {
      //   // url: process.env.MAINNET_URL,
      //   blockNumber: 14348871, // from specific block number, there will be balance corresponding to it
      //   runs: 1,
      // },
    },
  },

  etherscan: {
    apiKey: {
      polygon: process.env.POLYGONSCAN_API_KEY,
      polygonMumbai: process.env.POLYGONSCAN_API_KEY,
      bsc: process.env.BSC_KEY,
      mainnet: process.env.ETHERSCAN_API_KEY,
    },
  },

  defender: {
    apiKey: process.env.DEFENDER_KEY,
    apiSecret: process.env.DEFENDER_SECRET,
  },

  contractSizer: {
    alphaSort: true,
    disambiguatePaths: false,
    runOnCompile: false,
    strict: true,
    only: [],
  },
};