hardhat.config.ts

import 'hardhat-typechain'
import '@nomiclabs/hardhat-ethers'
import '@nomiclabs/hardhat-waffle'
import '@nomiclabs/hardhat-etherscan'
import "hardhat-preprocessor";
import fs from "fs"
import dotenv from 'dotenv'
dotenv.config()

function getRemappings() {
  return fs
    .readFileSync("remappings.txt", "utf8")
    .split("\n")
    .filter(Boolean) // remove empty lines
    .map((line) => line.trim().split("="));
}

export default {
  networks: {
    hardhat: {
      allowUnlimitedContractSize: true,
    },
    mainnet: {
      url: `https://mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    ropsten: {
      url: `https://ropsten.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    rinkeby: {
      url: `https://rinkeby.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    goerli: {
      url: `https://goerli.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    kovan: {
      url: `https://kovan.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    arbitrumRinkeby: {
      url: `https://arbitrum-rinkeby.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    arbitrum: {
      url: `https://arbitrum-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    optimismKovan: {
      url: `https://optimism-kovan.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    optimism: {
      url: `https://optimism-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    mumbai: {
      url: `https://polygon-mumbai.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    polygon: {
      url: `https://polygon-mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
    },
    bnb: {
      url: `https://bsc-dataseed.binance.org/`,
    },
  },
  etherscan: {
    // Your API key for Etherscan
    // Obtain one at https://etherscan.io/
    apiKey: process.env.ETHERSCAN_API_KEY,
  },
  solidity: {
    version: '0.7.6',
    settings: {
      optimizer: {
        enabled: true,
        runs: 200, 
      },
      metadata: {
        // do not include the metadata hash, since this is machine dependent
        // and we want all generated code to be deterministic
        // https://docs.soliditylang.org/en/v0.7.6/metadata.html
        bytecodeHash: 'none',
      },
    },
  },
  preprocess: {
    eachLine: () => ({
      transform: (line: string) => {
        if (line.match(/^\s*import /i)) {
          getRemappings().forEach(([find, replace]) => {
            if (line.match(find)) {
              line = line.replace(find, replace);
            }
          });
        }
        return line;
      },
    }),
  },
  paths: {
    sources: "./contracts",
    cache: "./cache_hardhat",
  },
}