# Berachain Create HelloWorld Contract Using Hardhat Viem

This Berachain guided repository will show you the configurations needed to set up the Berachain testnet with Hardhat viem, deploy, and verify the contract.

## Requirements

- NVM or Node `v18.18.2+`
- MetaMask Wallet With `BERA` tokens
- npm

## Quick Setup

Install dependencies:

```bash
# FROM ./create-helloworld-contract-using-hardhat

npm install;
```

Configure environment variables.

```bash
# FROM ./create-helloworld-contract-using-hardhat

cp .env.example .env;
```

The only variable you will need to set is the `WALLET_PRIVATE_KEY` for the Berachain network.

**File:** `.env`

```bash
# Replace this ↴
WALLET_PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
```

## Deploy Contract To Berachain

When your `WALLET_PRIVATE_KEY` is set up correctly, run the following to compile and deploy the contract.

```bash
# FROM ./create-helloworld-contract-using-hardhat

npm run compile; # npx hardhat compile;

# [Expected Output]:
# Compiled 1 Solidity file successfully (evm target: paris).

npm run deploy:berachain; # npx hardhat run scripts/deploy.ts --network berachainTestnet;

# [Expected Equivalent Output]:
# {
#   hash: '0x2b25280a9fc27917b3755c07f79ae74b1249f3a03ab379d08b8f8980cd98b83f'
# }
# HelloWorld deployed to 0x38f8423cc4390938c01616d7a9f761972e7f116a
```

## Verify Contract On Berachain

In order to verify your contract, take note of the deployed contract `address` and the initial argument message deployed with it `"Hello From Deployed Contract"`.

```bash
# FROM ./create-helloworld-contract-using-hardhat

# npx hardhat verify --network berachainTestnet 0x38f8423cc4390938c01616d7a9f761972e7f116a "Hello From Deployed Contract";
npm run verify 0x38f8423cc4390938c01616d7a9f761972e7f116a "Hello From Deployed Contract";

# [Expected Output]:
# Successfully submitted source code for contract
# contracts/HelloWorld.sol:HelloWorld at 0x38f8423cc4390938c01616d7a9f761972e7f116a
# for verification on the block explorer. Waiting for verification result...

# Successfully verified contract HelloWorld on the block explorer.
# https://bartio.beratrail.io/address/0x38f8423cc4390938c01616d7a9f761972e7f116a#code
```

## Run Local Node

If you'd like to run the contract locally with Hardhat, run the following commands:

**Terminal 1:**

```bash
# FROM ./create-helloworld-contract-using-hardhat

npm run node; # npx hardhat node;

# [Expected Output]:
# Started HTTP and WebSocket JSON-RPC server at http://127.0.0.1:8545/
#
# Accounts
# ========
#
# WARNING: These accounts, and their private keys, are publicly known.
# Any funds sent to them on Mainnet or any other live network WILL BE LOST.
# ...
```

**Terminal 2:**

```bash
# FROM ./create-helloworld-contract-using-hardhat

npm run deploy:localhost; # npx hardhat run scripts/deploy.ts --network localhost;

# [Expected Output]:
# HelloWorld deployed to 0x5fbdb2315678afecb367f032d93f642f64180aa3
```

## Run Tests

To run tests defined in `./test/HelloWorld.test.ts`, run the following:

```bash
# FROM ./create-helloworld-contract-using-hardhat

npm run test; # npx hardhat test;

# [Expected Output]:
#  HelloWorld
#    Deployment
#      ✔ Should deploy with original message (1929ms)
#      ✔ Should set a new message
#
#
#  2 passing (2s)
```