Solidity Now: Hardhat Rollup Compatibility Checker for Solidity

Solidity Now is a hardhat plugin which helps you check your contracts compatibility for rollup. Now it supports scroll, polygon, optimism,zksync for now. More rollups are WIP.

The project is still early version, may change frequently and be unstable. Welcome for issue for bug report.

Quick start (run working demo)

cd /examples/0x
npm i --dev
npx hardhat compat-check --chain scroll

Use in your hardhat workflow

Basic Usage

For example, you have writen some contracts trying to deploy them to scroll. Before you do deploy, you can check your contracts by using:

// install this packadge
npm install --save-dev @unifra/hardhat-compat

// add following settings under you hardhat compiler config
{"*": ["abi", "metadata", "devdoc", "userdoc", "storageLayout", "evm.legacyAssembly", "evm.methodIdentifiers"]}

// run checking
npx hardhat compat-check --chain scroll

use it with zksync hardhat plugins

• step 1

  zksync-cli create demo
  cd demo
  yarn add @unifra/hardhat-compat --dev
  

• step 2

  edit hardhat.config.ts

  1. add following line:

  require("@unifra/hardhat-compat");
  

  1. edit object solidity like this:

  solidity: {
   version: "0.8.17", // any version you want
   settings: {
     outputSelection: {
       "*": {
         "": [],
         "*": ["evm.legacyAssembly", "abi", "metadata", "devdoc", "userdoc", "storageLayout", "evm.methodIdentifiers"]
       }
     }
   }
  }
  

• step 3 Remove all files in ./contracts/, write your own contracts, then run this command:

  npx hardhat compat-check --chain zksync
  

  output would be like:

  cleaning cache...
  compiling...
  Compiling contracts for zkSync Era with zksolc v1.3.13 and solc v0.8.17
  Compiling 1 Solidity file
  Successfully compiled 1 Solidity file
  checking compatibility of [zksync]...
  Warning: opcode [CODESIZE], may have difference behaviour with ethereum. 
  --> contracts/Greeter.sol:7,5
  7 |    constructor(string memory _greeting) {
  8 |        greeting = _greeting;
  9 |    }
  
  
  
  Warning: opcode [CODECOPY], may have difference behaviour with ethereum. 
  --> contracts/Greeter.sol:7,5
  7 |    constructor(string memory _greeting) {
  8 |        greeting = _greeting;
  9 |    }
  
  
  
  Warning: opcode [CODECOPY], may have difference behaviour with ethereum. 
  --> contracts/Greeter.sol:4,1
  4 |contract Greeter {
  5 |    string private greeting;
  6 |
  7 |    constructor(string memory _greeting) {
  8 |        greeting = _greeting;
  9 |    }
  10 |
  11 |    function greet() public view returns (string memory) {
  12 |        return greeting;
  13 |    }
  14 |
  15 |    function setGreeting(string memory _greeting) public {
  16 |        greeting = _greeting;
  17 |    }
  18 |}
  
  
  
  checking compatibility of [zksync] done
  

Select rollup

$npx hardhat compat-check --help                                                   
Hardhat version 2.12.7

Usage: hardhat [GLOBAL OPTIONS] compat-check [--chain <STRING>]

OPTIONS:

  --chain       target chain(supported: scroll, polygon, optimism, zksync)

compat-check: check rollup compatibility of compiled contracts

For global options help run: hardhat help

How it works

How it works