hardhat.config.ts

import type { HardhatUserConfig } from "hardhat/types";
import { task } from "hardhat/config";
import fs from "fs";

import "@nomiclabs/hardhat-etherscan";
import "@nomiclabs/hardhat-waffle";
import "@typechain/hardhat";
import "hardhat-abi-exporter";
import "hardhat-gas-reporter";
import "hardhat-preprocessor";
import "solidity-coverage";
import "dotenv/config";

task("accounts", "Prints the list of accounts", async (_args, hre) => {
  const accounts = await hre.ethers.getSigners();
  accounts.forEach(async (account) => console.info(account.address));
});

const config: HardhatUserConfig = {
  defaultNetwork: "hardhat",
  networks: {
    hardhat: {
      allowUnlimitedContractSize: false,
      hardfork: "london", // Berlin is used (temporarily) to avoid issues with coverage
      mining: {
        auto: true,
        interval: 50000,
      },
      gasPrice: "auto",
    },
  },
  etherscan: {
    apiKey: process.env.ETHERSCAN_KEY,
  },
  solidity: {
    compilers: [
      {
        version: "0.8.16",
        settings: { optimizer: { enabled: true, runs: 888888 } },
      },
      {
        version: "0.8.13",
        settings: { optimizer: { enabled: true, runs: 888888 } },
      },
      {
        version: "0.7.0",
        settings: { optimizer: { enabled: true, runs: 888888 } },
      },
    ],
  },
  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/",
    tests: "./test",
    cache: "./cache",
    artifacts: "./artifacts",
  },
  abiExporter: {
    path: "./abis",
    runOnCompile: true,
    clear: true,
    flat: true,
    pretty: false,
    except: ["test*", "open-zeppelin*", "uniswap*"],
  },
  gasReporter: {
    enabled: !!process.env.REPORT_GAS,
    excludeContracts: ["test*", "open-zeppelin*"],
  },
};

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

export default config;