hardhat.config.ts

import * as dotenv from 'dotenv'; // see https://github.com/motdotla/dotenv#how-do-i-use-dotenv-with-// import dotfile
dotenv.config();
import { HardhatUserConfig } from 'hardhat/config';
import '@nomicfoundation/hardhat-toolbox';

const config: HardhatUserConfig = {
  solidity: {
    compilers: [
      {
        version: '0.5.12',
      },
      {
        version: '0.8.9',
      },
      {
        version: '0.8.7',
      },
      {
        version: '0.6.0',
      },
      {
        version: '0.8.4',
      },
      {
        version: '0.8.15',
        settings: {
          viaIR: true,
          optimizer: {
            enabled: true,
            runs: 200,
          },
        },
      },
      {
        version: '0.6.12',
      },
    ],
  },
  networks: {
    hardhat: {
      // For metamask
      // https://hardhat.org/metamask-issue
      chainId: 1337,

      // Since we compile/deploy monolith contracts (instead of separately deployed)
      // Some contracts (USDC) hit contract size limit
      allowUnlimitedContractSize: true,
    },
    // use mumbai
    mumbai: {
      // Set url to alchemy mumbai.
      url: 'https://polygon-mumbai.g.alchemy.com/v2/' + process.env.ALCHEMY_API_KEY!,
      chainId: 80001,
      accounts: [process.env.MUMBAI_PRIVATE_KEY!],
    },
  }
};

export default config;