第五章：hardhat框架

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hardhat是目前以太坊dapp开发中最常使用的框架，已经替代truffle，主流协议目前绝大多数都使用hardhat，它可以快速的：完成合约部署、单测，fork等

常用插件汇总：

1. hardhat-contract-sizer，检查合约size

2. hardhat-storage-layout，检查状态变量的布局，优化gas

   • contract: is the name of the contract including its path as prefix
   • state variable: is the name of the state variable
   • offset: is the offset in bytes within the storage slot according to the encoding
   • storage slot: is the storage slot where the state variable resides or starts. This number may be very large and therefore its JSON value is represented as a string.
   • type: is an identifier used as key to the variable’s type information (described in the following)
   • numberOfBytes: is the nummber of bytes used by the state variable.