Hardhat

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What is Hardhat?

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Creating a Hardhat Project

1. Create a directory for your project:
   mkdir hardhat && cd hardhat
   
2. Initialize the project, which will create a package.json file
   npm init -y
   
3. Install Hardhat
   npm install hardhat
   
4. Create a project
   npx hardhat
   
5. 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
   

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Creating Your Smart Contract

1. Create a contracts directory
   mkdir contracts && cd contracts
   
2. Create your_contract.sol file in contracts directory
   touch your_contract.sol
   

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Creating Your Configuration File

1. Create a secrets.json file to store your private key
   touch secrets.json
   
2. Add your private key to secrets.json
   {
       "privateKey": "YOUR-PRIVATE-KEY-HERE"
   }
   
3. Add the file to your project’s .gitignore, and never reveal your private key.
4. Modify the hardhat.config.js file
   • Import the Ethers.js plugin
   • Import the secrets.json file
   • Inside the module.exports add the Caldera network configuration
   hardhat.config.js

   require('@nomiclabs/hardhat-ethers');
   const { privateKey } = require('./secrets.json');
   
   module.exports = {
   solidity: "0.8.1",
   defaultNetwork: "rinkeby",
   networks: {
       rinkeby: {
       url: "https://eth-rinkeby.alchemyapi.io/v2/123abc123abc123abc123abc123abcde",
       accounts: [privateKey]
       },
       caldera: {
       url: "RPC URL",  // Insert your RPC URL Here
       }
   },
   }
   

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Deploying Your Smart Contract

1. Compile the contract
   npx hardhat compile
   
2. Create a new directory for the script and name it scripts and add a new file to it called deploy.js
   mkdir scripts && cd scripts
   touch deploy.js
   
3. Create a deployment script, like the one below
   scripts/deploy.js

   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);
   });
   
4. Deploy your_contract.sol using the command below
   npx hardhat run scripts/deploy.js --network caldera