hardhat.config.js

require("dotenv").config();
require("@nomiclabs/hardhat-etherscan");
require("@nomiclabs/hardhat-waffle");
require("@nomiclabs/hardhat-solhint");
require("@nomiclabs/hardhat-ethers");
require("@nomiclabs/hardhat-truffle5");
require("hardhat-gas-reporter");
require("solidity-coverage");
require("hardhat-deploy");

const RINKEBY_RPC_URL = process.env.RINKEBY_RPC_URL;
const POLYGON_RPC_URL = process.env.POLYGON_RPC_URL;
const PRIVATE_KEY = process.env.PRIVATE_KEY;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY;

module.exports = {
  //solidity: "0.8.12",
  solidity: {
    compilers: [
      { version: "0.8.12" },
      { version: "0.8.0" },
      { version: "0.6.6" },
    ],
  },
  defaultNetwork: "hardhat",
  networks: {
    rinkeby: {
      url: RINKEBY_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 4,
      blockConfirmations: 6,
    },
    polygon: {
      url: POLYGON_RPC_URL,
      accounts: [PRIVATE_KEY],
      chainId: 137,
    },
    localhost: {
      url: "http://127.0.0.1:8545/",
      chainId: 31337,
    },
  },
  gasReporter: {
    enabled: true,
    outputFile: "gas-report.txt",
    currency: "USD",
    coinmarketcap: COINMARKETCAP_API_KEY,
    token: "ETH"
  },
  etherscan: {
    apiKey: ETHERSCAN_API_KEY,
  },
  namedAccounts: {
    deployer: {
      default: 0,
    },
    user: {
      default: 1,
    },
  },
};