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Template - Hardhat

This repo is a template for starting a new Hardhat project.

Getting Started

git clone https://github.com/EridianAlpha/hardhat-template
cd hardhat-template
yarn upgrade --latest

Compile

yarn compile

Testing

yarn test

Test Coverage

yarn coverage

Linting

To check linting / code formatting:

yarn lint

or, to fix:

yarn lint:fix

Formatting

yarn format

Estimate gas

You can estimate how much gas things cost by running:

yarn 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, every time 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.


Deployment to a testnet

  1. Setup environment variables

You'll want to set your TESTNET_RPC_URL and PRIVATE_KEY as environment variables. You can add them to a .env file.

  • PRIVATE_KEY: The private key of your account.
  • TESTNET_RPC_URL: This is url of the testnet node you're working with.
  1. Get testnet ETH

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

  1. Deploy
yarn hardhat deploy --network <TEST_NETWORK>

Scripts

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

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 environment 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:

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

https://github.com/othneildrew/Best-README-Template

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