hardhat.config.ts

import fs from "fs";

import type { HardhatUserConfig } from "hardhat/config";

import "dotenv/config";
import "@nomiclabs/hardhat-ethers";
import "@nomiclabs/hardhat-waffle";
import "@nomiclabs/hardhat-etherscan";
import "@typechain/hardhat";
import "hardhat-gas-reporter";
import "hardhat-preprocessor";

// Configure remappings.
// https://book.getfoundry.sh/config/hardhat
// Re-run `forge remappings > remappings.txt`
// every time you modify libraries in Foundry.
function getRemappings() {
  return fs
    .readFileSync("remappings.txt", "utf8")
    .split("\n")
    .filter(Boolean) // remove empty lines
    .map((line: string) => line.trim().split("="));
}

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

const config: HardhatUserConfig = {
  solidity: {
    compilers: [
      {
        version: "0.8.17",
        settings: {
          viaIR: false,
          optimizer: {
            enabled: true,
            runs: 1_000_000,
          },
          metadata: {
            bytecodeHash: "none",
          },
        },
      },
    ],
  },
  networks: {
    hardhat: {
      blockGasLimit: 30_000_000,
      throwOnCallFailures: false,
    },
    verificationNetwork: {
      url: process.env.NETWORK_RPC ?? "",
    },
  },
  gasReporter: {
    enabled: process.env.REPORT_GAS !== undefined,
    currency: "USD",
  },
  etherscan: {
    apiKey: process.env.EXPLORER_API_KEY,
  },
  preprocess: {
    eachLine: (hre) => ({
      transform: (line: string) => {
        if (line.match(/ from "/i)) {
          getRemappings().forEach(([find, replace]: string[]) => {
            if (line.match(find)) {
              line = line.replace(find, replace);
            }
          });
        }
        return line;
      },
    }),
  },
  // specify separate cache for hardhat, since it could possibly conflict with foundry's
  paths: { sources: "./src", cache: "./hh-cache" },
};

export default config;