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of 22Explain the structure of a typical Hardhat project and its key configuration files.
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A typical Hardhat project structure includes:
project/
├── contracts/ # Smart contracts
├── scripts/ # Deployment scripts
├── test/ # Test files
├── hardhat.config.js # Main configuration
├── package.json # Node.js dependencies
└── artifacts/ # Compiled contracts (auto-generated)
The hardhat.config.js is the most important file, containing:
- Network configurations
- Compiler settings
- Plugin imports
- Task definitions
- Path configurations
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How do you configure different networks in Hardhat?
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Networks are configured in the hardhat.config.js file under the networks object:
module.exports = {
networks: {
localhost: {
url: "http://127.0.0.1:8545"
},
goerli: {
url: "https://goerli.infura.io/v3/YOUR_INFURA_KEY",
accounts: [PRIVATE_KEY]
},
mainnet: {
url: "https://mainnet.infura.io/v3/YOUR_INFURA_KEY",
accounts: [PRIVATE_KEY],
gasPrice: 20000000000
}
}
};
You can then deploy to specific networks using: npx hardhat run scripts/deploy.js --network goerli
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How do you write and run tests in Hardhat?
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Hardhat supports multiple testing frameworks. Using Mocha and Chai:
const { expect } = require("chai");
const { ethers } = require("hardhat");
describe("Token", function () {
let token;
let owner, addr1;
beforeEach(async function () {
[owner, addr1] = await ethers.getSigners();
const Token = await ethers.getContractFactory("Token");
token = await Token.deploy();
});
it("Should assign total supply to owner", async function () {
const ownerBalance = await token.balanceOf(owner.address);
expect(await token.totalSupply()).to.equal(ownerBalance);
});
});
Run tests with: npx hardhat test
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How do you handle deployment scripts in Hardhat?
How do you handle environment variables and secrets in Hardhat?
What is Hardhat Network and what are its key features?
Explain fixtures in Hardhat testing and their benefits.
What are Hardhat plugins and how do you use them?
How do you debug smart contracts in Hardhat?
Explain how to fork mainnet in Hardhat and its use cases.
How do you handle gas optimization and estimation in Hardhat?
What are Hardhat tasks and how do you create custom tasks?
How do you handle contract verification in Hardhat?
What are coverage reports in Hardhat and how do you generate them?
How do you handle multiple Solidity compiler versions in Hardhat?
How do you implement and test time-dependent functionality in Hardhat?
What are the best practices for organizing and structuring Hardhat projects?
Explain how to work with upgradeable contracts in Hardhat.
Explain how to mock external contracts and dependencies in Hardhat tests.
How do you handle contract size limitations and optimize deployments in Hardhat?
Explain how to integrate Hardhat with frontend applications and development workflows.
How do you handle multi-signature wallets and complex authorization in Hardhat testing?
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