hardhat.config.ts

import { HardhatUserConfig } from "hardhat/config";
require("dotenv").config();
require("@nomiclabs/hardhat-ethers");
require("@nomiclabs/hardhat-etherscan");
require("@openzeppelin/hardhat-upgrades");

const { API_URL, PRIVATE_KEY } = process.env;

module.exports = {
   solidity: { 
    version: "0.8.9",
    settings: {
      optimizer: {
        enabled: true,
        runs: 500,
      },
    },
  },
   defaultNetwork: "polygon_mumbai",
   networks: {
      hardhat: {},
      polygon_mumbai: {
         url: API_URL,
         accounts: [`0x${PRIVATE_KEY}`]
      }
   },
}

/* const config: HardhatUserConfig = {
  solidity: {
    compilers: [
      {
        version: "0.8.9",
      },
      {
        version: "0.5.0",
      },
    ],
  },
  networks: {
    localhost: {
      url: `http://localhost:8545`,
      gas: 6000000,
      blockGasLimit: 30000000,
    },
  },
};

export default config;
 */