👷 convertToShares + decimalsOffset

src/KSXVault.sol

@@ -4,13 +4,31 @@ pragma solidity 0.8.25;
 import {ERC4626} from
     "@openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol";
 import {ERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import {FixedPointMathLib} from "lib/solady/src/utils/FixedPointMathLib.sol";
 
 /// @title Kwenta Example Contract
 /// @notice KSX ERC4626 Vault
 /// @author Flocqst ([email protected])
 contract KSXVault is ERC4626 {
-    constructor(address _token)
+
+    /// @notice Decimal offset used for calculating the conversion rate between KWENTA and KSX.
+    /// @dev Set to 3 to ensure the initial fixed ratio of 1,000 KSX per KWENTA
+    uint256 public immutable decimalsOffset;
+
+    constructor(address _token, uint256 _decimalsOffset)
         ERC4626(IERC20(_token))
         ERC20("KSX Vault", "KSX")
-    {}
+    {
+        decimalsOffset = _decimalsOffset;
+    }
+
+
+    function convertToShares(uint256 assets) public view virtual override returns (uint256 shares) {
+            uint256 o = decimalsOffset;
+            if (o == 0) {
+                return FixedPointMathLib.fullMulDiv(assets, totalSupply() + 1, totalAssets() + 1);
+            }
+            return FixedPointMathLib.fullMulDiv(assets, totalSupply() + 10 ** o, totalAssets() + 1);
+    }
+
 }