update yarn.lock file

Signed-off-by: Ihor Farion <ihor@umaproject.org>

Author: grasphoper

contracts/libraries/OFTTransportAdapter.sol

@@ -18,6 +18,9 @@ interface IERC20Decimals {
 contract OFTTransportAdapter {
     using AddressToBytes32 for address;
 
+    bytes public constant MSG_EMPTY_PARAM = new bytes(0);
+    address public constant ZERO_ADDRESS = address(0);
+
     IERC20 public immutable usdt;
     IOFT public immutable oftTransport;
 
@@ -49,8 +52,13 @@ contract OFTTransportAdapter {
         return address(oftTransport) != address(0) && address(usdt) == _token;
     }
 
+    /**
+     * @notice Transfers USDT from the current domain to the given address on the new domain.
+     * @dev This function will revert if the OFT bridge is disabled. I.e. if the zero address is passed to the constructor for the cctpTokenMessenger.
+     * @param _to Address to receive USDT on the new domain represented as bytes32.
+     * @param amount Amount of USDT to transfer.
+     */
     function _transferUsdt(address _to, uint256 amount) internal {
-        // @dev: building `SendParam` struct
         // receiver address converted to bytes32
         bytes32 to = _to.toBytes32();
 
@@ -67,11 +75,19 @@ contract OFTTransportAdapter {
         // bytes memory extraOptions = OptionsBuilder.newOptions(); // todo: this requires installing an extra lib `solidity-bytes-utils`
         bytes memory extraOptions = new bytes(0);
 
-        // todo: can make these an immutable storage var, ZERO_BYTES? Idk
         bytes memory composeMsg = new bytes(0);
         bytes memory oftCmd = new bytes(0);
 
-        SendParam memory sendParam = SendParam(dstEid, to, amountLD, minAmountLD, extraOptions, composeMsg, oftCmd);
+        // we don't use last 3 params to the `send()` call later, so we set them to zero bytes const, `MSG_EMPTY_PARAM`
+        SendParam memory sendParam = SendParam(
+            dstEid,
+            to,
+            amountLD,
+            minAmountLD,
+            MSG_EMPTY_PARAM,
+            MSG_EMPTY_PARAM,
+            MSG_EMPTY_PARAM
+        );
 
         MessagingFee memory fee = oftTransport.quoteSend(sendParam, false);
 
@@ -80,7 +96,7 @@ contract OFTTransportAdapter {
         (MessagingReceipt memory msgReceipt, OFTReceipt memory oftReceipt) = oftTransport.send{ value: fee.nativeFee }(
             sendParam,
             fee,
-            address(0)
+            ZERO_ADDRESS
         );
 
         // todo: possible further actions: