Configuring Hardhat

Hardhat is a development environment for Solidity development, so it is entirely fine to use it as a platform for developing and testing your smart contracts.

Hardhat can also be used to deploy your smart contracts to Litheum.

To install hardhat on your system (within npx), run:

npx hardhat

To create a new hardhat project, run:

mkdir my-hardhat-project
cd my-hardhat-project
npx hardhat init

Install dotenv:

npm install dotenv

Create a .env file and add your private key:

echo "PRIVATE_KEY=your_private_key_here" > .env

Add the following to your hardhat.config.ts file:

import { HardhatUserConfig } from "hardhat/config";
import "@nomicfoundation/hardhat-toolbox";

require('dotenv').config(); // Add this line
const { PRIVATE_KEY } = process.env; // Add this line

const config: HardhatUserConfig = {
  solidity: "0.8.9",
  networks: {
    ...SNIP...
    litheum: {  // Add this line
      url: `https://testnet.litheum.com`, // Add this line
      chainId: 1174, // Add this line
      loggingEnabled: true, // Add this line
      accounts: [`0x${PRIVATE_KEY}`], // Add this line
    },
  }
};

export default config;

Create a script directory:

mkdir script

Create a deploy.ts file in the script directory:

import { ethers } from "hardhat";

async function main() {

  const Lock = await ethers.getContractFactory("Lock");
  const lock = await Lock.deploy();

  await lock.deployed();

  console.log(`Contract deployed to ${lock.address}`);
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

npx hardhat run script/deploy.ts --network litheum

This will deploy your smart contracts to the Litheum testnet.