sdk-viem-adapter doesn't support HDAccount as signer

[aaronmboyd]

Viem adapter will not sign when configured with HDAccount, even though this partially inherits the same parent type as an Account class in viem created via other methods (like privateKeyToAccount). Nor does it work supplying the full optional walletClient to the adapter constructor (created with the HDAccount as account).

I don't have the exact error message as I've already implemented the workaround and moved on.

const account: HDAccount = mnemonicToAccount("test test test test test test test test test test test junk");
const options: ViemAdapterOptions = {
        provider: publicClient,
        signer: account,
    };
const adapter = new ViemAdapter(options);
    <sign transaction, fails....>    

Current workaround:

   const privateKey = (walletClient.account as HDAccount).getHdKey().privateKey;
   const options: ViemAdapterOptions = {
        provider: publicClient,
        signer: toHex(privateKey),
    };
   const adapter = new ViemAdapter(options);
    <sign transaction, succeeds....>       

Expectation:

• Can instantiate the dapter signer with any account that interfaces LocalAccount ?

I was asked to tag @jeffersonBastos

[jeffersonBastos]

Hello, thanks for reporting this.
I tried to reproduce the error locally and didn’t encounter any issues signing. Which version of the SDK are you using?

By replicating exactly the code you shared, the error occurs due to the parameters being passed — but it also happens in the workaround you mentioned:

Cannot infer a transaction type from provided transaction

[aaronmboyd]

Hello, thanks for reporting this. I tried to reproduce the error locally and didn’t encounter any issues signing. Which version of the SDK are you using?

By replicating exactly the code you shared, the error occurs due to the parameters being passed — but it also happens in the workaround you mentioned:

Cannot infer a transaction type from provided transaction

Yeah sorry was pseudocode I was in a bit of a hurry. However I believe that was the error I was getting. What is the meaning of this error?

What do you mean "due to the parameters being passed"? Are you saying my instantiation of the viem adapter object is incorrect? Assume the mnemonic is correct and there is a viem publicClient object created in the usual way (using imported createPublicClient from viem)

[jeffersonBastos]

Error: Cannot infer a transaction type from provided transaction.

To infer the type, either provide:
- an EIP-1559 Transaction with `maxFeePerGas`, or
- a Legacy Transaction with `gasPrice`

It happens when gas parameters are missing

await adapter.signer.signTransaction({
    to: '0x...',
    value: parseEther('0.01'),
    data: '0x',
    maxFeePerGas: 1000000000n, // <---
    maxPriorityFeePerGas: 1000000000n, //  <---
});

[aaronmboyd]

Error: Cannot infer a transaction type from provided transaction.

To infer the type, either provide:
- an EIP-1559 Transaction with `maxFeePerGas`, or
- a Legacy Transaction with `gasPrice`

It happens when gas parameters are missing

await adapter.signer.signTransaction({
    to: '0x...',
    value: parseEther('0.01'),
    data: '0x',
    maxFeePerGas: 1000000000n, // <---
    maxPriorityFeePerGas: 1000000000n, //  <---
});

Thanks. I'm not using the adapter directly like this, I'm using the postSwapOrderFromQuote function with no parameters that comes from the quote request. It is working now, using private key directly. Do we need to manually specify the gas parameters when using a HDAccount?

[jeffersonBastos]

No, you don’t need to specify gas parameters.

• postSwapOrderFromQuote signs EIP-712 messages (off-chain), not blockchain transactions. Gas params are only required when you sign blockchain transactions (signTransaction).
• I tested here and HDAccount works for this, It produces identical signatures when using the same private key
• Gas parameters are not relevant for EIP-712 signing