refactor: more coherent file names

src/ChainlinkOracle.sol

@@ -4,20 +4,20 @@ pragma solidity 0.8.19;
 import {IOracle} from "morpho-blue/interfaces/IOracle.sol";
 
 import {AggregatorV3Interface, ChainlinkDataFeedLib} from "./libraries/ChainlinkDataFeedLib.sol";
-import {ERC4626, VaultDataFeedLib} from "./libraries/VaultDataFeedLib.sol";
+import {ERC4626Interface, VaultLib} from "./libraries/VaultLib.sol";
 
 /// @title ChainlinkOracle
 /// @author Morpho Labs
 /// @custom:contact [email protected]
 /// @notice Morpho Blue oracle using Chainlink-compliant feeds.
 contract ChainlinkOracle is IOracle {
-    using VaultDataFeedLib for ERC4626;
+    using VaultLib for ERC4626Interface;
     using ChainlinkDataFeedLib for AggregatorV3Interface;
 
     /* IMMUTABLES */
 
     /// @notice Vault.
-    ERC4626 public immutable VAULT;
+    ERC4626Interface public immutable VAULT;
     /// @notice Vault decimals.
     uint256 public immutable VAULT_DECIMALS;
     /// @notice First base feed.
@@ -41,7 +41,7 @@ contract ChainlinkOracle is IOracle {
     /// @param baseTokenDecimals Base token decimals.
     /// @param quoteTokenDecimals Quote token decimals.
     constructor(
-        ERC4626 vault,
+        ERC4626Interface vault,
         AggregatorV3Interface baseFeed1,
         AggregatorV3Interface baseFeed2,
         AggregatorV3Interface quoteFeed1,

src/interfaces/ERC4626Interface.sol

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+interface ERC4626Interface {
+    function convertToAssets(uint256) external view returns (uint256);
+    function decimals() external view returns (uint256);
+}

src/libraries/VaultDataFeedLib.sol → src/libraries/VaultLib.sol

@@ -1,31 +1,24 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.0;
 
-import {AggregatorV3Interface} from "../interfaces/AggregatorV3Interface.sol";
-
-import {ErrorsLib} from "./ErrorsLib.sol";
-
-interface ERC4626 {
-    function convertToAssets(uint256) external view returns (uint256);
-    function decimals() external view returns (uint256);
-}
+import {ERC4626Interface} from "../interfaces/ERC4626Interface.sol";
 
 /// @title ChainlinkDataFeedLib
 /// @author Morpho Labs
 /// @custom:contact [email protected]
 /// @notice Library exposing functions to interact with a Chainlink-compliant feed.
-library VaultDataFeedLib {
+library VaultLib {
     /// @dev Converts `shares` into the corresponding assets on the `vault`.
     /// @dev When `vault` is the address zero, returns 1.
-    function getAssets(ERC4626 vault, uint256 shares) internal view returns (uint256) {
+    function getAssets(ERC4626Interface vault, uint256 shares) internal view returns (uint256) {
         if (address(vault) == address(0)) return 1;
 
         return vault.convertToAssets(shares);
     }
 
     /// @dev Returns the number of decimals of a `vault`, seen as an ERC20.
     /// @dev When `vault` is the address zero, returns 0.
-    function getDecimals(ERC4626 vault) internal view returns (uint256) {
+    function getDecimals(ERC4626Interface vault) internal view returns (uint256) {
         if (address(vault) == address(0)) return 0;
 
         return vault.decimals();

test/ChainlinkOracleTest.sol

@@ -23,8 +23,8 @@ AggregatorV3Interface constant ethUsdFeed = AggregatorV3Interface(0x5f4eC3Df9cbd
 // 18 decimals of precision
 AggregatorV3Interface constant daiEthFeed = AggregatorV3Interface(0x773616E4d11A78F511299002da57A0a94577F1f4);
 
-ERC4626 constant vaultZero = ERC4626(address(0));
-ERC4626 constant sDaiVault = ERC4626(0x83F20F44975D03b1b09e64809B757c47f942BEeA);
+ERC4626Interface constant vaultZero = ERC4626Interface(address(0));
+ERC4626Interface constant sDaiVault = ERC4626Interface(0x83F20F44975D03b1b09e64809B757c47f942BEeA);
 
 contract FakeAggregator {
     int256 public answer;