hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require("hardhat-gas-reporter");
require("solidity-coverage");
require("hardhat-gas-reporter");
require('hardhat-contract-sizer');
require("@nomiclabs/hardhat-ethers");
require("@nomiclabs/hardhat-etherscan");
require("dotenv").config();
/**
 * @type import('hardhat/config').HardhatUserConfig
 */

 module.exports = {
  solidity: {
    compilers: [
      {
        version: "0.7.4",
        settings: {
          optimizer: {
            enabled: true,
            runs: 300
          }
        }
      },
      {
        version: "0.8.3",
        settings: {
          optimizer: {
            enabled: true,
            runs: 300
          }
        }
      }
    ]
  },
  networks: {
    hardhat: {
      hardfork: process.env.CODE_COVERAGE ? "berlin" : "london",
      initialBaseFeePerGas: 0,
      accounts: {
        mnemonic:
          "nick lucian brenda kevin sam fiscal patch fly damp ocean produce wish",
        count: 40,
      },
      // forking: {
      //   url: "https://eth-mainnet.alchemyapi.io/v2/7dW8KCqWwKa1vdaitq-SxmKfxWZ4yPG6"
      // },
      allowUnlimitedContractSize: true
    } //,
    // rinkeby: {
    //      url: `${process.env.NODE_URL_RINKEBY}`,
    //      seeds: [process.env.PRIVATE_KEY],
    //      gas: 10000000 ,
    //      gasPrice: 40000000000
    // } ,
    //    mainnet: {
    //      url: `${process.env.NODE_URL_MAINNET}`,
    //      seeds: [process.env.PRIVATE_KEY],
    //      gas: 3000000 ,
    //      gasPrice: 300000000000
    //    },
    // polygon_testnet: {
    //     url: `${process.env.NODE_URL_MUMBAI}`,
    //     accounts: [process.env.TESTNET_PK],
    //     gas: 10000000 ,
    //     gasPrice: 50000000000
    //   },
    // polygon: {
    //   url: `${process.env.NODE_URL_MATIC}`,
    //   seeds: [process.env.PRIVATE_KEY],
    //   gas: 2000000 ,
    //   gasPrice: 250000000000
    // }
    // harmony_testnet: {
    //   url: `${process.env.NODE_URL_HARMONY_TESTNET}`,
    //   seeds: [process.env.TESTNET_PK],
    //   gas: 2000000 ,
    //   gasPrice: 250000000000
    // }
    , harmony_mainnet: {
      url: "https://api.harmony.one/",
      seeds: [process.env.PRIVATE_KEY],
      gas: 10000000 ,
      gasPrice: 50000000000
  }
  , arbitrum_testnet: {
    url: `${process.env.NODE_URL_ARBITRUM_TESTNET}`,
    seeds: [process.env.PRIVATE_KEY],
    gas: 10000000 ,
    gasPrice: 50000000000
  }
  , optimism_kovan: {
    url: "https://kovan.optimism.io/",
    seeds: [process.env.TESTNET_PK],
    gas: 10000000 ,
    gasPrice: 50000000000
  },
  goerli: {
    url: `${process.env.NODE_URL_GOERLI}`,
    seeds: [process.env.TESTNET_PK],
    gas: 10000000 ,
    gasPrice: 5000000000
  },
  sepolia: {
    url: `${process.env.NODE_URL_SEPOLIA}`,
    seeds: [process.env.TESTNET_PK],
    gas: 9000000 ,
    gasPrice: 5000000000

  }
  },
  
  etherscan: {
    apiKey: {
       // Your API key for Etherscan
   // Obtain one at https://etherscan.io/
   sepolia: process.env.ETHERSCAN
   //apiKey: process.env.POLYSCAN
   //apiKey: process.env.BSC_TOKEN
   //apiKey: process.env.OPTIMISMSCAN
    },
    customChains: [
      {
        network: "sepolia",
        chainId: 11155111,
        urls: {
          apiURL: "https://api-sepolia.etherscan.io/api",
          browserURL: "https://sepolia.etherscan.io"
        }
      }
    ]
  },

  contractSizer: {
    alphaSort: true,
    runOnCompile: true,
    disambiguatePaths: false,
  },

  mocha: {
    grep: "@skip-on-coverage", // Find everything with this tag
    invert: true               // Run the grep's inverse set.
  }

}