Refactor

contracts/ITokenGeyser.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.8.24;
+
+import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+/**
+ * @title Geyser staking interface
+ */
+interface ITokenGeyser {
+    function stake(uint256 amount) external;
+    function unstake(uint256 amount) external returns (uint256);
+    function totalStakedBy(address addr) external view returns (uint256);
+    function totalStaked() external view returns (uint256);
+    function totalLocked() external view returns (uint256);
+    function totalUnlocked() external view returns (uint256);
+    function stakingToken() external view returns (IERC20);
+    function distributionToken() external view returns (IERC20);
+}

contracts/ITokenPool.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pragma solidity ^0.8.24;
+
+import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+/**
+ * @title Token pool interface
+ */
+interface ITokenPool {
+    function init(IERC20 token_) external;
+    function token() external view returns (IERC20);
+    function balance() external view returns (uint256);
+    function transfer(address to, uint256 value) external;
+    function rescueFunds(address tokenToRescue, address to, uint256 amount) external;
+}