# Typescript SDK incorrectly transfers arguments to Sway smart contracts

**URL:** <https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801>\
**Category:** TypeScript SDK\
**Created:** [June 26, 2023, 1:31pm UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801 "2023-06-26T13:31:15Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![mpoplavkov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/mpoplavkov/32/399_2.png) [@mpoplavkov](https://forum.fuel.network/u/mpoplavkov)\
**Post date:** [June 26, 2023, 1:31pm UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/1 "2023-06-26T13:31:15Z")

</div>

I found a strange behavior of TypeScript SDK during working on a smart contract. It incorrectly passes arguments of type `Vec<b256>` to smart contract functions. Here is a simplified example:

> **Smart contract**
>
> The only point of this smart contract is to accept an argument of type `Vec<b256>` and log it to see exact values that were accepted by the contract.
> 
> ```plaintext
> contract;
> 
> storage {
> current_value: u8 = 0,
> }
> 
> abi MyContract {
> #[storage(write)]
> fn test_function(value: u8, proof: Vec<b256>) -> u64;
> }
> 
> impl MyContract for Contract {
> #[storage(write)]
> fn test_function(value: u8, proof: Vec<b256>) -> u64 {
> storage.current_value = value;
> let mut i = 0;
> while i < proof.len() {
> let elem: b256 = proof.get(i).unwrap();
> log(elem);
> i = i + 1;
> }
> 0
> }
> }
> 
> ```

> **TypeScript code**
>
> ```ts
> async function demonstrateBug() {
> const provider = new Provider("https://beta-3.fuel.network/graphql")
> // test account
> const wallet = Wallet.fromPrivateKey("0x5b2ced0e90112c4b11af7266fc4e768c67e5efc1388830d3867cd4f636721e01", provider)
> const contractInstance = ContractAbi__factory.connect(
> CONTRACT_ID,
> wallet
> );
> 
> const proof = [
> "0x4df54e3446d6beb23c7875c688498ca980bb51faef09c4b89ffb8fff0bbab01d",
> "0x8c1ee56d3419ab23abab2a80dc652d659ab5667b889f9e70cb9ed410f031502b",
> ]
> 
> console.log("Expected proof: ", proof)
> 
> const result =
> await contractInstance.functions.test_function(10, proof)
> .txParams({gasPrice: 1, gasLimit: 1000000})
> .call();
> 
> console.log("Actual proof: ", result.logs)
> }
> 
> ```

When calling the typescript code, I get the following results:

```auto
Expected proof: (2) ['0x4df54e3446d6beb23c7875c688498ca980bb51faef09c4b89ffb8fff0bbab01d', '0x8c1ee56d3419ab23abab2a80dc652d659ab5667b889f9e70cb9ed410f031502b']

Actual proof: (2) ['0x8359cb0aeaa45b3a64ebaf4c2905919a58c2f022197729450000000000000000', '0x000000000000000000000000000000000000000000000000000000001dcd64ff']

```

It seems like there is a bug in the SDK when passing these arguments.

The same example works correctly with Rust SDK.

> **fuelup show**
>
> ```sh
> active toolchain
> -----------------
> beta-3-aarch64-apple-darwin (default)
> forc : 0.37.3
> - forc-client
> - forc-deploy : 0.37.3
> - forc-run : 0.37.3
> - forc-doc : 0.37.3
> - forc-explore : 0.28.1
> - forc-fmt : 0.37.3
> - forc-index : 0.11.2
> - forc-lsp : 0.37.3
> - forc-tx : 0.37.3
> - forc-wallet : 0.2.2
> fuel-core : 0.17.11
> fuel-indexer : 0.11.2
> 
> fuels versions
> ---------------
> forc : 0.39
> 
> ```

fuels-ts version: 0.38.0  
fuels-rs version: 0.39.0

---

<div class="post-metadata">

**Author:** ![mpoplavkov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/mpoplavkov/32/399_2.png) [@mpoplavkov](https://forum.fuel.network/u/mpoplavkov)\
**Post date:** [June 26, 2023, 1:49pm UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/2 "2023-06-26T13:49:00Z")

</div>

The same flow works correctly when I use arrays instead of vectors:

> **Smart contract with arrays**
>
> ```plaintext
> contract;
> 
> storage {
> current_value: u8 = 0,
> }
> 
> abi MyContract {
> #[storage(write)]
> fn test_function(value: u8, proof: [b256; 2]) -> u64;
> }
> 
> impl MyContract for Contract {
> #[storage(write)]
> fn test_function(value: u8, proof: [b256; 2]) -> u64 {
> storage.current_value = value;
> let mut i = 0;
> while i < 2 {
> let elem: b256 = proof[i];
> log(elem);
> i = i + 1;
> }
> 0
> }
> }
> 
> ```

---

<div class="post-metadata">

**Author:** ![Dhaiwat10](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/dhaiwat10/32/1283_2.png) [@Dhaiwat10](https://forum.fuel.network/u/Dhaiwat10)\
**Post date:** [June 26, 2023, 6:08pm UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/3 "2023-06-26T18:08:47Z")

</div>

Hi, can you please try using the latest TS SDK version (0.45.0) and see if the problem persists?

---

<div class="post-metadata">

**Author:** ![mpoplavkov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/mpoplavkov/32/399_2.png) [@mpoplavkov](https://forum.fuel.network/u/mpoplavkov)\
**Post date:** [June 27, 2023, 10:23am UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/4 "2023-06-27T10:23:05Z")

</div>

Hi, I changed both the typegen and the ts sdk versions to 0.45.0 and now I’m getting the following error:

```auto
Uncaught (in promise) Error: Unknown field "txCreatedIdx" on type "Coin".: 
{
  "response": {
    "data": null,
    "errors": [
      {
        "message": "Unknown field \"txCreatedIdx\" on type \"Coin\".",
        "locations": [
          {
            "line": 20,
            "column": 3
          }
        ]
      },
      {
        "message": "Unknown type \"MessageCoin\"",
        "locations": [
          {
            "line": 23,
            "column": 1
          }
        ]
      },
      {
        "message": "Unknown field \"coinsToSpend\" on type \"Query\". Did you mean \"resourcesToSpend\"?",
        "locations": [
          {
            "line": 2,
            "column": 3
          }
        ]
      }
    ],
    "status": 200,
    "headers": {
      "map": {
        "content-type": "application/json"
      }
    }
  },
  "request": {
    "query": "query getCoinsToSpend($owner: Address!, $queryPerAsset: [SpendQueryElementInput!]!, $excludedIds: ExcludeInput) {\n coinsToSpend(\n owner: $owner\n queryPerAsset: $queryPerAsset\n excludedIds: $excludedIds\n ) {\n ...coinFragment\n ...messageCoinFragment\n }\n}\n\nfragment coinFragment on Coin {\n __typename\n utxoId\n owner\n amount\n assetId\n maturity\n blockCreated\n txCreatedIdx\n}\n\nfragment messageCoinFragment on MessageCoin {\n__ typename\n sender\n recipient\n nonce\n amount\n assetId\n daHeight\n}",
    "variables": {
      "owner": "0x984ac4a0e975137f905b02c0bca41bdb6020070a898e0418c7d5bc5b7562bc02",
      "queryPerAsset": [
        {
          "assetId": "0x0000000000000000000000000000000000000000000000000000000000000000",
          "amount": "10"
        }
      ],
      "excludedIds": {
        "messages": [],
        "utxos": []
      }
    }
  }
}

```

---

<div class="post-metadata">

**Author:** ![Dhaiwat10](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/dhaiwat10/32/1283_2.png) [@Dhaiwat10](https://forum.fuel.network/u/Dhaiwat10)\
**Post date:** [June 29, 2023, 7:22am UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/5 "2023-06-29T07:22:14Z")

</div>

Hi, that makes sense since 0.45 is not compatible with beta-3. My bad. Can you try using 0.44 instead?

---

<div class="post-metadata">

**Author:** ![mpoplavkov](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/mpoplavkov/32/399_2.png) [@mpoplavkov](https://forum.fuel.network/u/mpoplavkov)\
**Post date:** [June 29, 2023, 2:46pm UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/6 "2023-06-29T14:46:27Z")

</div>

Seems like it’s working with version 0.44, thanks. Is it safe to use 0.44 with beta-3? The recommended version in the fuel book is 0.38.0 ([source](https://fuelbook.fuel.network/master/networks/beta-3.html#sdk-versioning))

---

<div class="post-metadata">

**Author:** ![Dhaiwat10](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/dhaiwat10/32/1283_2.png) [@Dhaiwat10](https://forum.fuel.network/u/Dhaiwat10)\
**Post date:** [June 30, 2023, 12:38am UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/7 "2023-06-30T00:38:17Z")

</div>

Yeah, you should be fine using 0.44 too. Please let us know in case something comes up, though!

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex022/uploads/fuel/original/2X/5/57d5a345cc15a64b636e0d56e042857f8a0e80b1.png) [@system](https://forum.fuel.network/u/system)\
**Post date:** [July 20, 2023, 8:38pm UTC](https://forum.fuel.network/t/typescript-sdk-incorrectly-transfers-arguments-to-sway-smart-contracts/2801/8 "2023-07-20T20:38:29Z")

</div>

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