hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require("@nomiclabs/hardhat-solhint");
require("@nomiclabs/hardhat-etherscan");
require("hardhat-abi-exporter");
require("hardhat-docgen");
require("hardhat-tracer");
require("hardhat-gas-reporter");
require("solidity-coverage");
require("hardhat-preprocessor");
const fs = require("fs");

const etherscanApiKey = getEtherscanApiKey();

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

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: {
    version: "0.8.19",
    settings: {
      optimizer: {
        enabled: true,
        runs: 200,
      },
    },
  },
  paths: {
    sources: "./src", // Use ./src rather than ./contracts as Hardhat expects
    cache: "./cache_hardhat", // Use a different cache for Hardhat than Foundry
  },
  // This fully resolves paths for imports in the ./lib directory for Hardhat
  preprocess: {
    eachLine: (hre) => ({
      transform: (line) => {
        if (line.match(/^\s*import /i)) {
          getRemappings().forEach(([find, replace]) => {
            if (line.match(find)) {
              line = line.replace(find, replace);
            }
          });
        }
        return line;
      },
    }),
  },
  networks: {
    mainnet: mainnetNetworkConfig(),
    goerli: goerliNetworkConfig(),
  },
  abiExporter: {
    path: "./build/abi",
    clear: true,
    flat: true,
    spacing: 2,
  },
  docgen: {
    path: "./docs",
    clear: true,
    runOnCompile: true,
  },
  gasReporter: {
    currency: "USD",
  },
  etherscan: {
    apiKey: `${etherscanApiKey}`,
  },
};

function mainnetNetworkConfig() {
  let url = "https://mainnet.infura.io/v3/";
  let accountPrivateKey =
    "0x0000000000000000000000000000000000000000000000000000000000000000";
  if (process.env.MAINNET_ENDPOINT) {
    url = `${process.env.MAINNET_ENDPOINT}`;
  }

  if (process.env.MAINNET_PRIVATE_KEY) {
    accountPrivateKey = `${process.env.MAINNET_PRIVATE_KEY}`;
  }

  return {
    url: url,
    accounts: [accountPrivateKey],
  };
}

function goerliNetworkConfig() {
  let url = "https://goerli.infura.io/v3/";
  let accountPrivateKey =
    "0x0000000000000000000000000000000000000000000000000000000000000000";
  if (process.env.GOERLI_ENDPOINT) {
    url = `${process.env.GOERLI_ENDPOINT}`;
  }

  if (process.env.GOERLI_PRIVATE_KEY) {
    accountPrivateKey = `${process.env.GOERLI_PRIVATE_KEY}`;
  }

  return {
    url: url,
    accounts: [accountPrivateKey],
  };
}

function getEtherscanApiKey() {
  let apiKey = "";
  if (process.env.ETHERSCAN_API_KEY) {
    apiKey = `${process.env.ETHERSCAN_API_KEY}`;
  }
  return apiKey;
}