Add supportsInterface for type(IERC20).interfaceId

src/core/token/ERC20Core.sol

@@ -6,6 +6,8 @@ import {ModularCoreUpgradeable} from "../../ModularCoreUpgradeable.sol";
 import {ERC20} from "@solady/tokens/ERC20.sol";
 import {Multicallable} from "@solady/utils/Multicallable.sol";
 
+import {IERC20} from "../../interface/IERC20.sol";
+
 import {BeforeMintCallbackERC20} from "../../callback/BeforeMintCallbackERC20.sol";
 import {BeforeBurnCallbackERC20} from "../../callback/BeforeBurnCallbackERC20.sol";
 import {BeforeApproveCallbackERC20} from "../../callback/BeforeApproveCallbackERC20.sol";
@@ -105,6 +107,11 @@ contract ERC20Core is ERC20, ModularCoreUpgradeable, Multicallable {
         });
     }
 
+    /// @notice Returns whether a given interface is implemented by the contract.
+    function supportsInterface(bytes4 interfaceID) public view override returns (bool) {
+        return interfaceID == type(IERC20).interfaceId || super.supportsInterface(interfaceID);
+    }
+
     /*//////////////////////////////////////////////////////////////
                           EXTERNAL FUNCTIONS
     //////////////////////////////////////////////////////////////*/

src/core/token/ERC20CoreInitializable.sol

@@ -8,6 +8,8 @@ import {ModularCoreUpgradeable} from "../../ModularCoreUpgradeable.sol";
 import {ERC20} from "@solady/tokens/ERC20.sol";
 import {Multicallable} from "@solady/utils/Multicallable.sol";
 
+import {IERC20} from "../../interface/IERC20.sol";
+
 import {BeforeMintCallbackERC20} from "../../callback/BeforeMintCallbackERC20.sol";
 import {BeforeBurnCallbackERC20} from "../../callback/BeforeBurnCallbackERC20.sol";
 import {BeforeApproveCallbackERC20} from "../../callback/BeforeApproveCallbackERC20.sol";
@@ -110,6 +112,11 @@ contract ERC20CoreInitializable is ERC20, ModularCoreUpgradeable, Multicallable,
         });
     }
 
+    /// @notice Returns whether a given interface is implemented by the contract.
+    function supportsInterface(bytes4 interfaceID) public view override returns (bool) {
+        return interfaceID == type(IERC20).interfaceId || super.supportsInterface(interfaceID);
+    }
+
     /*//////////////////////////////////////////////////////////////
                           EXTERNAL FUNCTIONS
     //////////////////////////////////////////////////////////////*/

src/interface/IERC20.sol

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.23;
+
+interface IERC20 {
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    function totalSupply() external view returns (uint256);
+
+    function balanceOf(address account) external view returns (uint256);
+
+    function transfer(address to, uint256 value) external returns (bool);
+
+    function allowance(address owner, address spender) external view returns (uint256);
+
+    function approve(address spender, uint256 value) external returns (bool);
+
+    function transferFrom(address from, address to, uint256 value) external returns (bool);
+}