What are the main configuration items in Hardhat config file?

Hardhat's configuration file hardhat.config.js (or .ts) is the core configuration file of the project, mainly containing the following configuration items:

Basic Configuration:

1. Solidity Compiler Configuration

javascript
solidity: {
  version: "0.8.19",
  settings: {
    optimizer: {
      enabled: true,
      runs: 200
    }
  }
}

1. Network Configuration

javascript
networks: {
  hardhat: {
    chainId: 31337
  },
  sepolia: {
    url: process.env.SEPOLIA_RPC_URL,
    accounts: [process.env.PRIVATE_KEY]
  },
  mainnet: {
    url: process.env.MAINNET_RPC_URL,
    accounts: [process.env.PRIVATE_KEY]
  }
}

1. Path Configuration

javascript
paths: {
  sources: "./contracts",
  tests: "./test",
  cache: "./cache",
  artifacts: "./artifacts"
}

Advanced Configuration:

1. Plugin Configuration

javascript
require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-etherscan");

1. Etherscan Verification Configuration

javascript
etherscan: {
  apiKey: process.env.ETHERSCAN_API_KEY
}

1. Gas Reporter Configuration

javascript
gasReporter: {
  enabled: true,
  currency: "USD"
}

Best Practices:

• Use environment variables to store sensitive information
• Configure different networks for different environments (development, testing, production)
• Enable compiler optimization to reduce gas consumption
• Use TypeScript configuration files for type safety
• Reasonably set the optimizer runs parameter