hardhat.config.ts

import { task } from 'hardhat/config';

import { config as dotenvConfig } from 'dotenv';
import { resolve } from 'path';
dotenvConfig({ path: resolve(__dirname, './.env') });

import { HardhatUserConfig } from 'hardhat/types';
import { NetworkUserConfig } from 'hardhat/types';

import '@nomiclabs/hardhat-waffle';
import 'hardhat-typechain';
import 'hardhat-gas-reporter';
import '@nomiclabs/hardhat-etherscan';
import path from 'path';
import fs from 'fs';

const chainIds = {
  ganache: 1337,
  goerli: 5,
  hardhat: 31337,
  kovan: 42,
  mainnet: 1,
  rinkeby: 4,
  ropsten: 3,
};

const MNEMONIC = process.env.MNEMONIC || '';
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || '';
const INFURA_API_KEY = process.env.INFURA_API_KEY || '';
const ALCHEMY_KEY = process.env.ALCHEMY_KEY || '';

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task('accounts', 'Prints the list of accounts', async (args, hre) => {
  const accounts = await hre.ethers.getSigners();

  for (const account of accounts) {
    console.log(await account.address);
  }
});

function createTestnetConfig(
  network: keyof typeof chainIds,
): NetworkUserConfig {
  const url: string = 'https://' + network + '.infura.io/v3/' + INFURA_API_KEY;
  return {
    accounts: {
      count: 10,
      initialIndex: 0,
      mnemonic: MNEMONIC,
      path: "m/44'/60'/0'/0",
    },
    chainId: chainIds[network],
    url,
  };
}

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

const config: HardhatUserConfig = {
  defaultNetwork: 'hardhat',
  networks: {
    hardhat: {
      accounts: {
        mnemonic: MNEMONIC,
      },
      chainId: chainIds.hardhat,
    },
    goerli: createTestnetConfig('goerli'),
    kovan: createTestnetConfig('kovan'),
    rinkeby: createTestnetConfig('rinkeby'),
    ropsten: createTestnetConfig('ropsten'),
    mainnet: createTestnetConfig('mainnet'),
  },
  solidity: {
    compilers: [
      {
        version: '0.6.12',
      },
      {
        version: '0.6.6',
      },
    ],
  },
  etherscan: {
    apiKey: ETHERSCAN_API_KEY,
  },
  gasReporter: {
    currency: 'USD',
    gasPrice: 100,
    // enabled: process.env.REPORT_GAS ? true : false,
  },
};

export default config;