hardhat.config.ts

import "@nomicfoundation/hardhat-toolbox";
import "@nomicfoundation/hardhat-foundry";
import "hardhat-contract-sizer";
import "hardhat-deploy";
import "hardhat-preprocessor";
import fs from "fs";

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

/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  solidity: {
    compilers: [
      {
        version: "0.8.19",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
          },
        },
      },
    ],
  },

  namedAccounts: {
    deployer: 0,
  },

  networks: {
    hardhat: {},
    localhost: {},
    goerli: {
      url:
        process.env.GOERLI_URL ||
        `https://goerli.infura.io/v3/${process.env.INFURA_KEY}`,
      accounts:
        process.env.PRIVATE_KEY !== undefined ? [process.env.PRIVATE_KEY] : [],
    },
    arb: {
      url:
        process.env.ARB_URL ||
        `https://arb.getblock.io/${process.env.GETBLOCK_KEY}/mainnet/`,
      accounts:
        process.env.PRIVATE_KEY !== undefined ? [process.env.PRIVATE_KEY] : [],
    },
    mantle: {
      url: process.env.MANTLE_TESTNET_URL || `https://rpc.mantle.xyz/`,
      accounts:
        process.env.PRIVATE_KEY !== undefined ? [process.env.PRIVATE_KEY] : [],
    },
  },

  etherscan: {
    apiKey: {
      mantle: 'mantle',
      arb: process.env.ARBISCAN_API_KEY,
    },
    customChains: [
      {
        network: "mantle",
        chainId: 5000,
        urls: {
          apiURL: "https://explorer.mantle.xyz/api",
          browserURL: "https://explorer.mantle.xyz/"
        }
      }
    ]
  },

  preprocess: {
    eachLine: (hre) => ({
      transform: (line: string) => {
        if (line.match(/^\s*import /i)) {
          for (const [from, to] of getRemappings()) {
            if (line.includes(from)) {
              line = line.replace(from, to);
              break;
            }
          }
        }
        return line;
      },
    }),
  },
  paths: {
    sources: "./src",
    cache: "./cache_hardhat",
  },
};