fhevm-solidity/tasks/getEthereumAddress.ts

import dotenv from 'dotenv';
import { ethers } from 'ethers';
import { task } from 'hardhat/config';
import { HardhatRuntimeEnvironment } from 'hardhat/types';

dotenv.config();

const getEthereumAddress =
  (index: number = 0) =>
  async (_taskArgs: unknown, _: HardhatRuntimeEnvironment) => {
    const words = process.env.MNEMONIC!;
    const mnemonic = ethers.Mnemonic.fromPhrase(words);
    if (!mnemonic) {
      throw new Error('No MNEMONIC in .env file');
    }
    const wallet = ethers.HDNodeWallet.fromMnemonic(mnemonic, `m/44'/60'/0'/0`);
    console.log(wallet.deriveChild(index).address);
  };

task(
  'task:getEthereumAddress',
  'Gets the first address derived from a mnemonic phrase defined in .env',
  getEthereumAddress(0),
);

const accounts = ['Alice', 'Bob', 'Carol', 'Dave', 'Eve'];

accounts.forEach((name, index) => {
  task(
    `task:getEthereumAddress${name}`,
    'Gets the first address derived from a mnemonic phrase defined in .env',
    getEthereumAddress(index),
  );
});