Hardhat Template

A Hardhat-based template for developing Solidity smart contracts, with sensible defaults.

• Hardhat: compile, run and test smart contracts
• TypeChain: generate TypeScript bindings for smart contracts
• Ethers: renowned Ethereum library and wallet implementation
• Solhint: code linter
• Solcover: code coverage
• Prettier Plugin Solidity: code formatter

Getting Started

Click the Use this template button at the top of the page to create a new repository with this repo as the initial state.

Features

This template builds upon the frameworks and libraries mentioned above, so for details about their specific features, please consult their respective documentations.

For example, for Hardhat, you can refer to the Hardhat Tutorial and the Hardhat Docs. You might be in particular interested in reading the Testing Contracts section.

Sensible Defaults

This template comes with sensible default configurations in the following files:

├── .editorconfig
├── .eslintignore
├── .eslintrc.yml
├── .gitignore
├── .prettierignore
├── .prettierrc.yml
├── .solcover.js
├── .solhint.json
└── hardhat.config.ts

VSCode Integration

This template is IDE agnostic, but for the best user experience, you may want to use it in VSCode alongside Nomic Foundation's Solidity extension.

GitHub Actions

This template comes with GitHub Actions pre-configured. Your contracts will be linted and tested on every push and pull request made to the main branch.

Note though that to make this work, you must use your INFURA_API_KEY and your MNEMONIC as GitHub secrets.

You can edit the CI script in .github/workflows/ci.yml.

Usage

Pre Requisites

Before being able to run any command, you need to create a .env file and set a BIP-39 compatible mnemonic as an environment variable. You can follow the example in .env.example. If you don't already have a mnemonic, you can use this website to generate one.

Then, proceed with installing dependencies:

$ pnpm install

Compile

Compile the smart contracts with Hardhat:

$ pnpm compile

TypeChain

Compile the smart contracts and generate TypeChain bindings:

$ pnpm typechain

Test

Run the tests with Hardhat:

$ pnpm test

Lint Solidity

Lint the Solidity code:

$ pnpm lint:sol

Lint TypeScript

Lint the TypeScript code:

$ pnpm lint:ts

Coverage

Generate the code coverage report:

$ pnpm coverage

Report Gas

See the gas usage per unit test and average gas per method call:

$ REPORT_GAS=true pnpm test

Clean

Delete the smart contract artifacts, the coverage reports and the Hardhat cache:

$ pnpm clean

Deploy

Deploy the contracts to Hardhat Network:

$ pnpm deploy:contracts

Tasks

Deploy Greeter

Deploy a new instance of the Greeter contract via a task:

$ pnpm task:deployGreeter --network ganache --greeting "Bonjour, le monde!"

Set Greeting

Run the setGreeting task on the Ganache network:

$ pnpm task:setGreeting --network ganache --greeting "Bonjour, le monde!" --account 3

Tips

Syntax Highlighting

If you use VSCode, you can get Solidity syntax highlighting with the hardhat-solidity extension.

Using GitPod

GitPod is an open-source developer platform for remote development.

To view the coverage report generated by pnpm coverage, just click Go Live from the status bar to turn the server on/off.

Local development with Ganache

Install Ganache

$ npm i -g ganache

Run a Development Blockchain

$ ganache -s test

The -s test passes a seed to the local chain and makes it deterministic

Make sure to set the mnemonic in your .env file to that of the instance running with Ganache.

License

This project is licensed under MIT.