PatrickAlphaC / hardhat-fund-me-forked-fcc

Hardhat Fund Me

This is a section of the Javascript Blockchain/Smart Contract FreeCodeCamp Course.

Video Coming soon...

Full Repo

• Hardhat Fund Me
• Getting Started
  • Requirements
  • Quickstart
  • Typescript
• Useage
  • Testing
    • Test Coverage
• Deployment to a testnet or mainnet
  • Estimate gas
    • Estimate gas cost in USD
  • Verify on etherscan
• Thank you!

This project is apart of the Hardhat FreeCodeCamp video.

Video coming soon...

Getting Started

Requirements

• Nodejs & npm
  • 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 npm right if you can run:
    • npm --version
    • And get an ouput like:
    • x.x.x
• Optional yarn instead of npm

Quickstart

git clone https://github.com/PatrickAlphaC/hardhat-fund-me-fcc
cd hardhat-fund-me-fcc
npm install

Note: If you delete package-lock.json it won't install correctly with just package.json. You'll need to remove the line with @nomiclabs/hardhat-ethers from package.json, and then reinstall it with npm install --save-dev @nomiclabs/hardhat-ethers@npm:hardhat-deploy-ethers ethers. Read more here

Typescript

For the typescript edition, run:

git checkout typescript

Useage

Deploy:

npx hardhat deploy

Testing

In this version, we run testing off a forked mainnet, so you'll need to set your MAINNET_RPC_URL similar to how we set all our other environment variables.

npx hardhat test

Test Coverage

npx hardhat coverage

Deployment to a testnet or mainnet

1. Setup environment variabltes

You'll want to set your KOVAN_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.
• KOVAN_RPC_URL: This is url of the kovan testnet node you're working with. You can get setup with one for free from Alchemy

2. Get testnet ETH

Head over to faucets.chain.link and get some tesnet ETH. You should see the ETH show up in your metamask.

3. Deploy

npx hardhat deploy --network kovan

Estimate gas

You can estimate how much gas things cost by running:

npx hardhat test

And you'll see and output file called gas-report.txt

Estimate gas cost in USD

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.

Verify on etherscan

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 kovan contracts!

However, you can manual verify with:

npx hardhat verify --constructor-args arguments.js DEPLOYED_CONTRACT_ADDRESS

Thank you!

If you appreciated this, feel free to follow me or donate!

ETH/Polygon/Avalanche/etc Address: 0x9680201d9c93d65a3603d2088d125e955c73BD65