hardhat.config.ts

import "@nomicfoundation/hardhat-toolbox";
import { config as dotenvConfig } from "dotenv";
import * as fs from "fs";
import "hardhat-deploy";
import "hardhat-preprocessor";
import { TASK_PREPROCESS } from "hardhat-preprocessor";
import type { HardhatUserConfig } from "hardhat/config";
import { task } from "hardhat/config";
import type { NetworkUserConfig } from "hardhat/types";
import { resolve } from "path";
import * as path from "path";

import "./tasks/accounts";
import "./tasks/getEthereumAddress";

function getAllSolidityFiles(dir: string, fileList: string[] = []): string[] {
  fs.readdirSync(dir).forEach((file) => {
    const filePath = path.join(dir, file);
    if (fs.statSync(filePath).isDirectory()) {
      getAllSolidityFiles(filePath, fileList);
    } else if (filePath.endsWith(".sol")) {
      fileList.push(filePath);
    }
  });
  return fileList;
}

task("coverage-mock", "Run coverage after running pre-process task").setAction(async function (args, env) {
  const contractsPath = path.join(env.config.paths.root, "contracts/");
  const solidityFiles = getAllSolidityFiles(contractsPath);
  const originalContents: Record<string, string> = {};
  solidityFiles.forEach((filePath) => {
    originalContents[filePath] = fs.readFileSync(filePath, { encoding: "utf8" });
  });

  try {
    await env.run(TASK_PREPROCESS);
    await env.run("coverage");
  } finally {
    // Restore original files
    for (const filePath in originalContents) {
      fs.writeFileSync(filePath, originalContents[filePath], { encoding: "utf8" });
    }
  }
});

const dotenvConfigPath: string = process.env.DOTENV_CONFIG_PATH || "./.env";
dotenvConfig({ path: resolve(__dirname, dotenvConfigPath) });

const mnemonic: string | undefined = process.env.MNEMONIC;
if (!mnemonic) {
  throw new Error("Please set your MNEMONIC in a .env file");
}

const network = process.env.HARDHAT_NETWORK;

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

const chainIds = {
  zama: 8009,
  local: 9000,
  localNetwork1: 9000,
  multipleValidatorTestnet: 8009,
};

function getChainConfig(chain: keyof typeof chainIds): NetworkUserConfig {
  let jsonRpcUrl: string;
  switch (chain) {
    case "local":
      jsonRpcUrl = "http://localhost:8545";
      break;
    case "localNetwork1":
      jsonRpcUrl = "http://127.0.0.1:9650/ext/bc/fhevm/rpc";
      break;
    case "multipleValidatorTestnet":
      jsonRpcUrl = "https://rpc.fhe-ethermint.zama.ai";
      break;
    case "zama":
      jsonRpcUrl = "https://devnet.zama.ai";
      break;
  }
  return {
    accounts: {
      count: 10,
      mnemonic,
      path: "m/44'/60'/0'/0",
    },
    chainId: chainIds[chain],
    url: jsonRpcUrl,
  };
}

const config: HardhatUserConfig = {
  preprocess: {
    eachLine: () => ({
      transform: (line: string) => {
        if (network === "hardhat") {
          // checks if HARDHAT_NETWORK env variable is set to "hardhat" to use the remapping for the mocked version of TFHE.sol
          if (line.match(/".*.sol";$/)) {
            // match all lines with `"<any-import-path>.sol";`
            for (const [from, to] of getRemappings()) {
              if (line.includes(from)) {
                line = line.replace(from, to);
                break;
              }
            }
          }
        }
        return line;
      },
    }),
  },
  defaultNetwork: "local",
  namedAccounts: {
    deployer: 0,
  },
  mocha: {
    timeout: 500000,
  },
  gasReporter: {
    currency: "USD",
    enabled: process.env.REPORT_GAS ? true : false,
    excludeContracts: [],
    src: "./contracts",
  },
  networks: {
    zama: getChainConfig("zama"),
    localDev: getChainConfig("local"),
    local: getChainConfig("local"),
    localNetwork1: getChainConfig("localNetwork1"),
    multipleValidatorTestnet: getChainConfig("multipleValidatorTestnet"),
  },
  paths: {
    artifacts: "./artifacts",
    cache: "./cache",
    sources: "./contracts",
    tests: "./test",
  },
  solidity: {
    version: "0.8.22",
    settings: {
      metadata: {
        // Not including the metadata hash
        // https://github.com/paulrberg/hardhat-template/issues/31
        bytecodeHash: "none",
      },
      // Disable the optimizer when debugging
      // https://hardhat.org/hardhat-network/#solidity-optimizer-support
      optimizer: {
        enabled: true,
        runs: 800,
      },
      evmVersion: "shanghai",
    },
  },
  typechain: {
    outDir: "types",
    target: "ethers-v6",
  },
};

export default config;