feat: implement LibNonReentrancy

src/libraries/LibNonReentrancy.sol

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.8.30;
+
+/// @title LibNonReentrancy - Non-Reentrancy Library
+/// @notice Provides common non-reentrant functions for Solidity contracts.
+library LibNonReentrancy {
+    bytes32 constant NON_REENTRANT_SLOT = keccak256("compose.nonReentrant");
+
+    // Function selector - 0x43a0d067
+    error Reentrancy();
+
+    /// @dev How to use as a modifier in user facets
+    /*modifier nonReentrant {
+        LibNonReentrancy.enter();
+        _;
+        LibNonReentrancy.exit();
+    }
+    */
+
+    /// @dev This unlocks the entry into a function
+    function enter() internal {
+        bytes32 position = NON_REENTRANT_SLOT;
+        assembly ("memory-safe") {
+            if tload(position) {
+                mstore(0x00, 0x43a0d067)
+                revert(0x00, 0x04)
+            }
+            tstore(position, 1)
+        }
+    }
+
+    /// @dev This locks the entry into a function
+    function exit() internal {
+        bytes32 position = NON_REENTRANT_SLOT;
+        assembly {
+            tstore(position, 0)
+        }
+    }
+}