transaction.sign is not a function

Describe the bug I just upgraded to stellar javascript sdk 2.3.0. The old source code used to sign transactions using an instance of the TransactionBuilder’s sign() method. But now it doesn;t work, I get an error:

TypeError: transaction.sign is not a function

What version are you on? 2.3.0

To Reproduce Steps to reproduce the behavior:

1. Create a transaction using the following

const transaction = await new StellarSdk.TransactionBuilder(sourceAccount,{
        timebounds: await StellarSdk.Server.fetchTimebounds(100),
        networkPassphrase: this.network,
        fee: (BASE_FEE == null ? 100 : BASE_FEE) * 1 
      }).addOperation(this.stellar.StellarSdk.Operation.payment({
          destination: recKeys.publicKey(),
          asset: SOME_ASSET, 
          amount: '' + amount.toFixed(7),
      }))

transaction.sign(senderKeys)

1. The error happens on the last line transaction.sign(senderKeys)

Expected behavior For the transaction to be signed so i can submit to the stellar network

Additional context Add any other context about the problem here.

[moda20]

I figured out something which is to assign the transaction.build() to an other variable and use the new one since it is a Transaction object. let newTransaction = transaction.build() the way you mentioned doesn’t work for me.

[abuiles]

@gate3 there are a couple of issues in your code:

1. don’t use await in new StellarSdk.TransactionBuilder(sourceAccount,{
2. You have to call .build() at the end of transaction builder - otherwise you end up calling sign on the wrong class.
3. fetchTimebounds is not a static method on method, you should call it on a Server instance.

The following works:

  const transaction = new StellarSdk.TransactionBuilder(sourceAccount,{
    timebounds: await server.fetchTimebounds(100),
    networkPassphrase: StellarSdk.Networks.TESTNET,
    fee: 100,
  }).addOperation(StellarSdk.Operation.payment({
    destination: recKeys.publicKey(),
    asset: new StellarSdk.Asset.native(),
    amount: '100'
  })).build();


  transaction.sign(sendereKey);