which runs successfully through devInspectTransactionBlock()

Question

Hi all, I am using the Type Script SDK and receiving the error "UnusedValueWithoutDrop" after a tx.moveCall (flash_swap on MMT LP). I assume that I have to drop or transfer back the returned coins after the swap. Can someone tell me, how to efficiently drop / transfer the returned objects (currently NestedResult) after my moveCall? Appreciate any help, thanks!

Here is the code, which runs successfully through devInspectTransactionBlock()

let [returnCoinA, returnCoinB, returnReceip] = tx.moveCall({
            target: targetFunctionLP2,
            typeArguments: [suiTokenType, usdcTokenType],
            arguments: [
                tx.object(poolAddressLP2),
                tx.pure.bool(false),
                tx.pure.bool(true),
                tx.pure.u64(amountOutUSDNormalized),
                tx.pure.u128(limit_sqrt_priceB),
                tx.object(clockObjectAddressLP2),
                tx.object(versionAddressLP2),
            ],
        });
tx.transferObjects([returnCoinA, returnCoinB], tx.pure.address(sender))

harry phan · Accepted Answer

You need to do something with returnReceipt. I dont know what these objects are, but you can probably just add them to transferObjects if they arent expected to be passed into another call

Meaning.Sui · Answer

Youre getting the UnusedValueWithoutDrop error because every object returned from a Move call must be either transferred, used, destroyed, or explicitly dropped — otherwise, Sui throws that error to ensure safe and deterministic object handling. In your case, you’re handling returnCoinA and returnCoinB correctly by transferring them back to the sender. But you’re not doing anything with returnReceip, which is why the error is triggered. To fix this, you should explicitly drop returnReceip if it’s not needed, or transfer it if it contains data the user should keep. Heres how you can handle it depending on the case:

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which runs successfully through devInspectTransactionBlock()

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