hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require("dotenv").config({ path: ".env" });

// 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 (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners();

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

const getEnv = (variable, optional = false) => {
  if (!process.env[variable]) {
    if (optional) {
      console.warn(
        `[@env]: Environmental variable for ${variable} is not supplied.`
      );
    } else {
      throw new Error(
        `You must create an environment variable for ${variable}`
      );
    }
  }

  return process.env[variable]?.replace(/\\n/gm, "\n");
};

// Your mnemomic key
const MNEMONIC = getEnv("MNEMONIC");

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

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: "0.8.2",
  networks: {
    alfajores: {
      url: "https://alfajores-forno.celo-testnet.org",
      accounts: {
        mnemonic: process.env.MNEMONIC,
        path: "m/44'/60'/0'/0",
      },
      chainId: 44787,
    },
  },
};