web3-docs（web3 文档）

Web3 Docs

Current patterns and references for EVM development. Covers the full stack: contracts → testing → deployment → frontend integration.

Stack Coverage

Quick Lookup

Starting a new Foundry project: See references/foundry.md → Project Setup

Starting a Hardhat project: See references/hardhat.md → Installation

Writing an ERC-20: See references/openzeppelin.md → ERC-20

Building a yield vault (ERC-4626): See references/erc4626.md → OpenZeppelin Implementation

First depositor attack on vaults: See references/erc4626.md → First Depositor Attack

Connecting a wallet in React: See references/wagmi.md → Quick Start

Reading contract state with Viem: See references/viem.md → Read Contracts

Common Solidity errors: See references/solidity.md → Error Reference

Deploying to Optimism/Base with Hardhat: See references/hardhat.md → hardhat.config.ts

Fetch Latest Docs

scripts/fetch-docs.js <topic> pulls live docs from official sources when the reference files may be stale.

node scripts/fetch-docs.js solidity      # Solidity docs
node scripts/fetch-docs.js foundry       # Foundry book
node scripts/fetch-docs.js viem          # Viem docs
node scripts/fetch-docs.js wagmi         # Wagmi docs
node scripts/fetch-docs.js openzeppelin  # OZ docs
node scripts/fetch-docs.js hardhat       # Hardhat docs
node scripts/fetch-docs.js erc4626       # ERC-4626 (OZ vault docs)

Gas Optimization Quick Rules

1. Use calldata instead of memory for read-only function params
2. Pack storage variables: multiple uint128 in one slot beats two separate uint256
3. unchecked blocks for arithmetic that can't overflow (saves ~30 gas/op)
4. immutable > constant > storage for values set once
5. Events are cheaper than storage for historical data
6. Batch operations: one tx touching N items beats N txs