feat: add crosschain erc20 interface

packages/contracts-bedrock/semver-lock.json

@@ -116,8 +116,8 @@
     "sourceCodeHash": "0xfea53344596d735eff3be945ed1300dc75a6f8b7b2c02c0043af5b0036f5f239"
   },
   "src/L2/OptimismSuperchainERC20.sol": {
-    "initCodeHash": "0xc6452d9aef6d76bdc789f3cddac6862658a481c619e6a2e7a74f6d61147f927b",
-    "sourceCodeHash": "0x4463e49c98ceb3327bd768579341d1e0863c8c3925d4b533fbc0f7951306261f"
+    "initCodeHash": "0x964c826693c6633dc5eff6d4b059a30043775af46b06e42367aff91b904498da",
+    "sourceCodeHash": "0xf5cb8307067f2ef7aa540b9e0a4828cde76f783c7fb95c7d3f84c6d723f9d316"
   },
   "src/L2/OptimismSuperchainERC20Beacon.sol": {
     "initCodeHash": "0x99ce8095b23c124850d866cbc144fee6cee05dbc6bb5d83acadfe00b90cf42c7",
@@ -133,11 +133,11 @@
   },
   "src/L2/SuperchainERC20.sol": {
     "initCodeHash": "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
-    "sourceCodeHash": "0x9bc2e208774eb923894dbe391a5038a6189d7d36c202f4bf3e2c4dd332b0adf0"
+    "sourceCodeHash": "0x4debbf83ad569eae88fb1e70db5f45fb85eed609fd464bd180611756116e04ae"
   },
   "src/L2/SuperchainERC20Bridge.sol": {
-    "initCodeHash": "0xea7eb314f96cd2520a58012ff7cc376c82c5a95612187ff6bb96ace4f095ebc4",
-    "sourceCodeHash": "0x83188d878ce0b2890a7f7f41d09a8807f94a126e0ea274f0dac8b93f77217d3b"
+    "initCodeHash": "0xf85225ea25a87ba670b6ce0172a4814fda712d1c8a174fd4e8ce72b1cebcc2a0",
+    "sourceCodeHash": "0x66b56c0ac0d49b6da84da01a318f43418ef486e5fb40ae0af487568fde8566fb"
   },
   "src/L2/SuperchainWETH.sol": {
     "initCodeHash": "0x5db03c5c4cd6ea9e4b3e74e28f50d04fd3e130af5109b34fa208808fa9ba7742",

packages/contracts-bedrock/snapshots/abi/OptimismSuperchainERC20.json

@@ -30,7 +30,7 @@
         "type": "uint256"
       }
     ],
-    "name": "__superchainBurn",
+    "name": "__crosschainBurn",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -48,7 +48,7 @@
         "type": "uint256"
       }
     ],
-    "name": "__superchainMint",
+    "name": "__crosschainMint",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -427,7 +427,7 @@
       {
         "indexed": true,
         "internalType": "address",
-        "name": "account",
+        "name": "from",
         "type": "address"
       },
       {
@@ -443,14 +443,20 @@
   {
     "anonymous": false,
     "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "from",
+        "type": "address"
+      },
       {
         "indexed": false,
-        "internalType": "uint64",
-        "name": "version",
-        "type": "uint64"
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
       }
     ],
-    "name": "Initialized",
+    "name": "CrosschainBurnt",
     "type": "event"
   },
   {
@@ -459,7 +465,7 @@
       {
         "indexed": true,
         "internalType": "address",
-        "name": "account",
+        "name": "to",
         "type": "address"
       },
       {
@@ -469,26 +475,20 @@
         "type": "uint256"
       }
     ],
-    "name": "Mint",
+    "name": "CrosschainMinted",
     "type": "event"
   },
   {
     "anonymous": false,
     "inputs": [
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      },
       {
         "indexed": false,
-        "internalType": "uint256",
-        "name": "amount",
-        "type": "uint256"
+        "internalType": "uint64",
+        "name": "version",
+        "type": "uint64"
       }
     ],
-    "name": "SuperchainBurnt",
+    "name": "Initialized",
     "type": "event"
   },
   {
@@ -497,7 +497,7 @@
       {
         "indexed": true,
         "internalType": "address",
-        "name": "account",
+        "name": "to",
         "type": "address"
       },
       {
@@ -507,7 +507,7 @@
         "type": "uint256"
       }
     ],
-    "name": "SuperchainMinted",
+    "name": "Mint",
     "type": "event"
   },
   {

packages/contracts-bedrock/src/L2/OptimismSuperchainERC20.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import { IOptimismSuperchainERC20Extension } from "src/L2/interfaces/IOptimismSuperchainERC20.sol";
+import { IOptimismSuperchainERC20 } from "src/L2/interfaces/IOptimismSuperchainERC20.sol";
 import { Predeploys } from "src/libraries/Predeploys.sol";
 import { ERC165 } from "@openzeppelin/contracts-v5/utils/introspection/ERC165.sol";
 import { SuperchainERC20 } from "src/L2/SuperchainERC20.sol";
@@ -15,7 +15,7 @@ import { Initializable } from "@openzeppelin/contracts-v5/proxy/utils/Initializa
 ///         OptimismSuperchainERC20 token, turning it fungible and interoperable across the superchain. Likewise, it
 ///         also enables the inverse conversion path.
 ///         Moreover, it builds on top of the L2ToL2CrossDomainMessenger for both replay protection and domain binding.
-contract OptimismSuperchainERC20 is SuperchainERC20, Initializable, ERC165, IOptimismSuperchainERC20Extension {
+contract OptimismSuperchainERC20 is SuperchainERC20, Initializable, ERC165, IOptimismSuperchainERC20 {
     /// @notice Storage slot that the OptimismSuperchainERC20Metadata struct is stored at.
     /// keccak256(abi.encode(uint256(keccak256("optimismSuperchainERC20.metadata")) - 1)) & ~bytes32(uint256(0xff));
     bytes32 internal constant OPTIMISM_SUPERCHAIN_ERC20_METADATA_SLOT =
@@ -130,7 +130,6 @@ contract OptimismSuperchainERC20 is SuperchainERC20, Initializable, ERC165, IOpt
     /// @param _interfaceId Interface ID to check.
     /// @return Whether or not the interface is supported by this contract.
     function supportsInterface(bytes4 _interfaceId) public view virtual override returns (bool) {
-        return
-            _interfaceId == type(IOptimismSuperchainERC20Extension).interfaceId || super.supportsInterface(_interfaceId);
+        return _interfaceId == type(IOptimismSuperchainERC20).interfaceId || super.supportsInterface(_interfaceId);
     }
 }

packages/contracts-bedrock/src/L2/SuperchainERC20.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
-import { ISuperchainERC20Extension } from "src/L2/interfaces/ISuperchainERC20.sol";
+import { ISuperchainERC20 } from "src/L2/interfaces/ISuperchainERC20.sol";
 import { ISemver } from "src/universal/interfaces/ISemver.sol";
 import { Predeploys } from "src/libraries/Predeploys.sol";
 import { ERC20 } from "@solady/tokens/ERC20.sol";
@@ -10,7 +10,7 @@ import { ERC20 } from "@solady/tokens/ERC20.sol";
 /// @notice SuperchainERC20 is a standard extension of the base ERC20 token contract that unifies ERC20 token
 ///         bridging to make it fungible across the Superchain. This construction allows the SuperchainERC20Bridge to
 ///         burn and mint tokens.
-abstract contract SuperchainERC20 is ERC20, ISuperchainERC20Extension, ISemver {
+abstract contract SuperchainERC20 is ERC20, ISuperchainERC20, ISemver {
     /// @notice A modifier that only allows the SuperchainERC20Bridge to call
     modifier onlySuperchainERC20Bridge() {
         if (msg.sender != Predeploys.SUPERCHAIN_ERC20_BRIDGE) revert OnlySuperchainERC20Bridge();
@@ -26,18 +26,18 @@ abstract contract SuperchainERC20 is ERC20, ISuperchainERC20Extension, ISemver {
     /// @notice Allows the SuperchainERC20Bridge to mint tokens.
     /// @param _to     Address to mint tokens to.
     /// @param _amount Amount of tokens to mint.
-    function __superchainMint(address _to, uint256 _amount) external virtual onlySuperchainERC20Bridge {
+    function __crosschainMint(address _to, uint256 _amount) external virtual onlySuperchainERC20Bridge {
         _mint(_to, _amount);
 
-        emit SuperchainMinted(_to, _amount);
+        emit CrosschainMinted(_to, _amount);
     }
 
     /// @notice Allows the SuperchainERC20Bridge to burn tokens.
     /// @param _from   Address to burn tokens from.
     /// @param _amount Amount of tokens to burn.
-    function __superchainBurn(address _from, uint256 _amount) external virtual onlySuperchainERC20Bridge {
+    function __crosschainBurn(address _from, uint256 _amount) external virtual onlySuperchainERC20Bridge {
         _burn(_from, _amount);
 
-        emit SuperchainBurnt(_from, _amount);
+        emit CrosschainBurnt(_from, _amount);
     }
 }

packages/contracts-bedrock/src/L2/SuperchainERC20Bridge.sol

@@ -31,7 +31,7 @@ contract SuperchainERC20Bridge is ISuperchainERC20Bridge {
     function sendERC20(address _token, address _to, uint256 _amount, uint256 _chainId) external {
         if (_to == address(0)) revert ZeroAddress();
 
-        ISuperchainERC20(_token).__superchainBurn(msg.sender, _amount);
+        ISuperchainERC20(_token).__crosschainBurn(msg.sender, _amount);
 
         bytes memory message = abi.encodeCall(this.relayERC20, (_token, msg.sender, _to, _amount));
         IL2ToL2CrossDomainMessenger(MESSENGER).sendMessage(_chainId, address(this), message);
@@ -53,7 +53,7 @@ contract SuperchainERC20Bridge is ISuperchainERC20Bridge {
 
         uint256 source = IL2ToL2CrossDomainMessenger(MESSENGER).crossDomainMessageSource();
 
-        ISuperchainERC20(_token).__superchainMint(_to, _amount);
+        ISuperchainERC20(_token).__crosschainMint(_to, _amount);
 
         emit RelayERC20(_token, _from, _to, _amount, source);
     }

packages/contracts-bedrock/src/L2/interfaces/ICrosschainERC20.sol

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+/// @title ICrosschainERC20
+/// @notice Defines the interface for crosschain ERC20 transfers.
+interface ICrosschainERC20 {
+    /// @notice Emitted when a crosschain transfer mints tokens.
+    /// @param to       Address of the account tokens are being minted for.
+    /// @param amount   Amount of tokens minted.
+    event CrosschainMinted(address indexed to, uint256 amount);
+
+    /// @notice Emitted when a crosschain transfer burns tokens.
+    /// @param from     Address of the account tokens are being burned from.
+    /// @param amount   Amount of tokens burned.
+    event CrosschainBurnt(address indexed from, uint256 amount);
+
+    /// @notice Mint tokens through a crosschain transfer.
+    /// @param _to     Address to mint tokens to.
+    /// @param _amount Amount of tokens to mint.
+    function __crosschainMint(address _to, uint256 _amount) external;
+
+    /// @notice Burn tokens through a crosschain transfer.
+    /// @param _from   Address to burn tokens from.
+    /// @param _amount Amount of tokens to burn.
+    function __crosschainBurn(address _from, uint256 _amount) external;
+}

packages/contracts-bedrock/src/L2/interfaces/IOptimismSuperchainERC20.sol

@@ -2,31 +2,26 @@
 pragma solidity ^0.8.0;
 
 // Interfaces
-import { ISuperchainERC20, ISuperchainERC20Extension } from "src/L2/interfaces/ISuperchainERC20.sol";
-import { IERC20Solady } from "src/vendor/interfaces/IERC20Solady.sol";
+import { ISuperchainERC20 } from "src/L2/interfaces/ISuperchainERC20.sol";
 
-/// @title IOptimismSuperchainERC20Errors
-/// @notice Interface containing the errors added in the OptimismSuperchainERC20 implementation.
-interface IOptimismSuperchainERC20Errors {
+/// @title IOptimismSuperchainERC20
+/// @notice This interface is available on the OptimismSuperchainERC20 contract.
+interface IOptimismSuperchainERC20 is ISuperchainERC20 {
     /// @notice Thrown when attempting to perform an operation and the account is the zero address.
     error ZeroAddress();
 
     /// @notice Thrown when attempting to mint or burn tokens and the function caller is not the L2StandardBridge
     error OnlyL2StandardBridge();
-}
 
-/// @title IOptimismSuperchainERC20Extension
-/// @notice This interface is available on the OptimismSuperchainERC20 contract.
-interface IOptimismSuperchainERC20Extension is ISuperchainERC20Extension, IOptimismSuperchainERC20Errors {
     /// @notice Emitted whenever tokens are minted for an account.
-    /// @param account Address of the account tokens are being minted for.
+    /// @param to Address of the account tokens are being minted for.
     /// @param amount  Amount of tokens minted.
-    event Mint(address indexed account, uint256 amount);
+    event Mint(address indexed to, uint256 amount);
 
     /// @notice Emitted whenever tokens are burned from an account.
-    /// @param account Address of the account tokens are being burned from.
+    /// @param from Address of the account tokens are being burned from.
     /// @param amount  Amount of tokens burned.
-    event Burn(address indexed account, uint256 amount);
+    event Burn(address indexed from, uint256 amount);
 
     /// @notice Allows the L2StandardBridge and SuperchainERC20Bridge to mint tokens.
     /// @param _to     Address to mint tokens to.
@@ -41,7 +36,3 @@ interface IOptimismSuperchainERC20Extension is ISuperchainERC20Extension, IOptim
     /// @notice Returns the address of the corresponding version of this token on the remote chain.
     function remoteToken() external view returns (address);
 }
-
-/// @title IOptimismSuperchainERC20
-/// @notice Combines Solady's ERC20 interface with the IOptimismSuperchainERC20Extension interface.
-interface IOptimismSuperchainERC20 is IERC20Solady, IOptimismSuperchainERC20Extension { }

packages/contracts-bedrock/src/L2/interfaces/ISuperchainERC20.sol

@@ -2,41 +2,11 @@
 pragma solidity ^0.8.0;
 
 // Interfaces
-import { IERC20Solady } from "src/vendor/interfaces/IERC20Solady.sol";
+import { ICrosschainERC20 } from "src/L2/interfaces/ICrosschainERC20.sol";
 
-/// @title ISuperchainERC20Errors
-/// @notice Interface containing the errors added in the SuperchainERC20 implementation.
-interface ISuperchainERC20Errors {
+/// @title ISuperchainERC20
+/// @notice This interface is available on the SuperchainERC20 contract.
+interface ISuperchainERC20 is ICrosschainERC20 {
     /// @notice Thrown when attempting to mint or burn tokens and the function caller is not the SuperchainERC20Bridge.
     error OnlySuperchainERC20Bridge();
 }
-
-/// @title ISuperchainERC20Extension
-/// @notice This interface is available on the SuperchainERC20 contract.
-interface ISuperchainERC20Extension is ISuperchainERC20Errors {
-    /// @notice Emitted whenever tokens are minted for by the SuperchainERC20Bridge.
-    /// @param account Address of the account tokens are being minted for.
-    /// @param amount  Amount of tokens minted.
-    event SuperchainMinted(address indexed account, uint256 amount);
-
-    /// @notice Emitted whenever tokens are burned by the SuperchainERC20Bridge.
-    /// @param account Address of the account tokens are being burned from.
-    /// @param amount  Amount of tokens burned.
-    event SuperchainBurnt(address indexed account, uint256 amount);
-
-    /// @notice Allows the SuperchainERC20Bridge to mint tokens.
-    /// @param _to     Address to mint tokens to.
-    /// @param _amount Amount of tokens to mint.
-    function __superchainMint(address _to, uint256 _amount) external;
-
-    /// @notice Allows the SuperchainERC20Bridge to burn tokens.
-    /// @param _from   Address to burn tokens from.
-    /// @param _amount Amount of tokens to burn.
-    function __superchainBurn(address _from, uint256 _amount) external;
-}
-
-/// @title ISuperchainERC20
-/// @notice Combines Solady's ERC20 interface with the SuperchainERC20Extension interface.
-interface ISuperchainERC20 is IERC20Solady, ISuperchainERC20Extension {
-    function __constructor__() external;
-}