ℹ️ Important: This repo is no longer maintained; we invite all people learning Solidity to head to Cyfrin Updraft! The 100% free #1 smart contract education platform on earth. Developed with love by Patrick & Cyfrin <3
This is a section of the Javascript Blockchain/Smart Contract FreeCodeCamp Course.
This repo has been updated to work with Sepolia over Goerli.
⌨️ (28:53:11) Lesson 16: Hardhat Upgrades
- Hardhat Upgrades
- Getting Started
- Usage
- Deployment to a testnet or mainnet
- Linting
- Formatting
- Thank you!
This project is apart of the Hardhat FreeCodeCamp video.
Checkout the full blockchain solidity course video here
- git
- You'll know you did it right if you can run
git --version
and you see a response likegit version x.x.x
- You'll know you did it right if you can run
- Nodejs
- You'll know you've installed nodejs right if you can run:
node --version
and get an ouput like:vx.x.x
- You'll know you've installed nodejs right if you can run:
- Yarn instead of
npm
- You'll know you've installed yarn right if you can run:
yarn --version
and get an output like:x.x.x
- You might need to install it with npm
- You'll know you've installed yarn right if you can run:
git clone https://github.com/PatrickAlphaC/hardhat-upgrades-fcc
cd hardhat-upgrades-fcc
yarn
For the typescript edition, run:
git checkout typescript
If you can't or don't want to run and install locally, you can work with this repo in Gitpod. If you do this, you can skip the clone this repo
part.
Deploy:
yarn hardhat deploy
yarn hardhat test
yarn hardhat coverage
- Setup environment variabltes
You'll want to set your SEPOLIA_RPC_URL
and PRIVATE_KEY
as environment variables. You can add them to a .env
file, similar to what you see in .env.example
.
PRIVATE_KEY
: The private key of your account (like from metamask). NOTE: FOR DEVELOPMENT, PLEASE USE A KEY THAT DOESN'T HAVE ANY REAL FUNDS ASSOCIATED WITH IT.- You can learn how to export it here.
SEPOLIA_RPC_URL
: This is url of the sepolia testnet node you're working with. You can get setup with one for free from Alchemy
- Get testnet ETH
Head over to faucets.chain.link and get some tesnet ETH. You should see the ETH show up in your metamask.
- Deploy
yarn hardhat deploy --network sepolia
After deploy to a testnet or local net, you can run the scripts.
yarn hardhat run scripts/fund.js
or
yarn hardhat run scripts/withdraw.js
You can estimate how much gas things cost by running:
yarn hardhat test
And you'll see and output file called gas-report.txt
To get a USD estimation of gas cost, you'll need a COINMARKETCAP_API_KEY
environment variable. You can get one for free from CoinMarketCap.
Then, uncomment the line coinmarketcap: COINMARKETCAP_API_KEY,
in hardhat.config.js
to get the USD estimation. Just note, everytime you run your tests it will use an API call, so it might make sense to have using coinmarketcap disabled until you need it. You can disable it by just commenting the line back out.
If you deploy to a testnet or mainnet, you can verify it if you get an API Key from Etherscan and set it as an environemnt variable named ETHERSCAN_API_KEY
. You can pop it into your .env
file as seen in the .env.example
.
In it's current state, if you have your api key set, it will auto verify sepolia contracts!
However, you can manual verify with:
yarn hardhat verify --constructor-args arguments.js DEPLOYED_CONTRACT_ADDRESS
To check linting / code formatting:
yarn lint
or, to fix:
yarn lint:fix
yarn format
If you appreciated this, feel free to follow me or donate!
ETH/Polygon/Avalanche/etc Address: 0x9680201d9c93d65a3603d2088d125e955c73BD65