hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require('dotenv').config();
require("@nomiclabs/hardhat-ethers");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-gas-reporter");
const { API_URL, PRIVATE_KEY ,ETHERSCAN_API_KEY } = process.env;

// 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:{
    version: "0.8.17",
    settings: {
        optimizer: {
          enabled: true,
          runs: 200,
        },
      }
  } ,
  defaultNetwork: "goerli",
  networks: {
     hardhat: {},
     rinkeby: {
        url: API_URL,
        accounts: [`0x${PRIVATE_KEY}`]
     },
     goerli: {
            url: API_URL,
            accounts: [`0x${PRIVATE_KEY}`]
        } 
  },
  etherscan: {
    // Your API key for Etherscan
    // Obtain one at https://etherscan.io/
    apiKey: ETHERSCAN_API_KEY
  },
  gasReporter: {
    enabled: true,
    noColors:true,
    currency:"ETH",
    gasPrice: 20

    // outputFile:"gas-report.txt",
  }
};