Using Hardhat
What is Hardhat?
Hardhat is a development environment for Ethereum that helps developers manage and automate the common tasks involved in building smart contracts and decentralized applications. It can directly interact with Caldera's Ethereum API, allowing for the deployment of smart contracts into the Caldera network.
Additionally, Hardhat is a comprehensive set of tools for creating Ethereum-based software, which includes various components that aid in editing, compiling, debugging, and deploying smart contracts and decentralized applications. All of these components work together to create a complete development environment.
Creating a Hardhat Project
Create a directory for your project:
mkdir hardhat && cd hardhat
Initialize the project, which will create a
package.json
filenpm init -y
Install Hardhat
npm install hardhat
Create a project
npx hardhat
Create an empty
hardhat.config.js
and install the Ethers plugin to use the Ethers.js library to interact with the network.npm install @nomiclabs/hardhat-ethers ethers
Creating Your Smart Contract
Create a
contracts
directorymkdir contracts && cd contracts
Create
your_contract.sol
file incontracts
directorytouch your_contract.sol
Creating Your Configuration File
Modify the Hardhat configuration file and create a secure file to store your private key in.
Create a
secrets.json
file to store your private keytouch secrets.json
Add your private key to
secrets.json
{ "privateKey": "YOUR-PRIVATE-KEY-HERE" }
Add the file to your project's
.gitignore
, and never reveal your private key.Modify the
hardhat.config.js
fileImport the Ethers.js plugin
Import the
secrets.json
fileInside the
module.exports
add the Caldera network configuration
require('@nomiclabs/hardhat-ethers'); const { privateKey } = require('./secrets.json'); module.exports = { solidity: "0.8.1", defaultNetwork: "rinkeby", networks: { xr: { url: "https://xr-sepolia-testnet.rpc.caldera.xyz/http", chainId: 2730, } }, }
Deploying Your Smart Contract
Compile the contract
npx hardhat compilejs
Create a new directory for the script and name it scripts and add a new file to it called
deploy.js
mkdir scripts && cd scriptstouch deploy.js
Create a deployment script, like the one below
async function main() { // 1. Get the contract to deploy const Your_Contract = await ethers.getContractFactory('your_contract'); console.log('Deploying Your_Contract...'); // 2. Instantiating a new smart contract const your_contract = await Your_Contract.deploy(); // 3. Waiting for the deployment to resolve await your_contract.deployed(); // 4. Use the contract instance to get the contract address console.log('Your_Contract deployed to:', your_contract.address); } main() .then(() => process.exit(0)) .catch((error) => { console.error(error); process.exit(1); } );
Deploy
your_contract.sol
using the command belownpx hardhat run scripts/deploy.js --network xr
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