hardhat-tutorial

hardhat tutorial

1. Installing Node.js
2. Creating a new Hardhat project

mkdir hardhat-tutorial
cd hardhat-tutorial
npm init
npm install --save-dev hardhat
npx hardhat
npm install --save-dev @nomicfoundation/hardhat-toolbox

3. Writing and compiling smart contracts

• Writing smart contracts
• Compiling contracts

  npx hardhat compile

4. Testing contracts

• Writing tests

  npx hardhat test
  # npx hardhat test .\test\Token.js 

5. Debugging with Hardhat Network

• Solidity console.log

  pragma solidity ^0.8.0;
  
  import "hardhat/console.sol";
  
  contract Token {
    //...
  }

  function transfer(address to, uint256 amount) external {
      require(balances[msg.sender] >= amount, "Not enough tokens");
  
      console.log(
          "Transferring from %s to %s %s tokens",
          msg.sender,
          to,
          amount
      );
  
      balances[msg.sender] -= amount;
      balances[to] += amount;
  
      emit Transfer(msg.sender, to, amount);
  }

7. Deploying to a live network

   npx hardhat run scripts/deploy.js --network <network-name>
   #npx hardhat run scripts/deploy.js --network sepolia

8. Deploying to remote networks

To deploy to a remote network such as mainnet or any testnet, you need to add a network entry to your hardhat.config.js file. We’ll use Sepolia for this example, but you can add any network similarly:

  require("@nomicfoundation/hardhat-toolbox");

  // Go to https://infura.io, sign up, create a new API key
  // in its dashboard, and replace "KEY" with it
  const INFURA_API_KEY = "KEY";

  // Replace this private key with your Sepolia account private key
  // To export your private key from Coinbase Wallet, go to
  // Settings > Developer Settings > Show private key
  // To export your private key from Metamask, open Metamask and
  // go to Account Details > Export Private Key
  // Beware: NEVER put real Ether into testing accounts
  const SEPOLIA_PRIVATE_KEY = "YOUR SEPOLIA PRIVATE KEY";

  module.exports = {
    solidity: "0.8.19",
    networks: {
      sepolia: {
        url: `https://sepolia.infura.io/v3/${INFURA_API_KEY}`,
        accounts: [SEPOLIA_PRIVATE_KEY]
      }
    }
  };

Infura | Alchemy