Using Hardhat

This page describes how to deploy smart contracts using Hardhat.

Hardhat

Hardhat is a development environment for Ethereum software. It consists of different components for editing, compiling, debugging and deploying your smart contracts and dApps, all of which work together to create a complete development environment.

Hardhat documentation, see: https://hardhat.org/docs

Steps

1. Install Hardhat

npm install --save-dev hardhat

To create a new Hardhat project,

npx hardhat

Select Create a TypeScript project then press enter to confirm the project root.

Select y for both adding a .gitignore and loading the sample project.

2. Update your project’s hardhat.config.ts file by adding Kroma Mainnet as a network:

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

require('dotenv').config();

const config: HardhatUserConfig = {
  solidity: {
    version: '0.8.17',
  },
  networks: {
    // for kroma mainnet
    'kroma-mainnet': {
      url: 'https://api.kroma.network',
      chainId: 255,
      accounts: [process.env.PRIVATE_KEY as string],
    },
    // for local devnet
    'kroma-local': {
      url: 'http://localhost:8545',
      chainId: 7790,
      accounts: [process.env.PRIVATE_KEY as string],
    },
  },
  defaultNetwork: 'hardhat',
};

export default config;

3. create a .env file with the following content ( It is critical that you do NOT commit this to a public repo)

PRIVATE_KEY=<YOUR_PRIVATE_KEY>

4. Finaly, Run it using npx hardhat run

npx hardhat run scripts/deploy.ts --network kroma-mainnet