timed order

src/Constants.sol

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity =0.7.6;
+pragma abicoder v2;
+
+import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Factory.sol";
+import "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol";
+import "@uniswap/v3-periphery/contracts/interfaces/INonfungiblePositionManager.sol";
+
+library Constants {
+    uint8 internal constant VERSION = 0;
+
+    IUniswapV3Factory internal constant uniswapV3Factory = IUniswapV3Factory(0x1F98431c8aD98523631AE4a59f267346ea31F984);
+    INonfungiblePositionManager internal constant uniswapV3NonfungiblePositionManager
+        = INonfungiblePositionManager(0xC36442b4a4522E871399CD717aBDD847Ab11FE88);
+    ISwapRouter internal constant uniswapV3SwapRouter
+        = ISwapRouter(0xE592427A0AEce92De3Edee1F18E0157C05861564);
+
+
+    // Swap statuses
+    string internal constant SWAP_OK = ''; // fastest comparison
+    // other errors may be passed through from Uniswap
+}