How to add confirmationStrategy in JS

Question

Hello I already read this question

But I don't know how to create the BlockheightBasedTransactionConfirmationStrategy object in JS as in that example TS is used.

I will like to get this code in JS:

const connection = new Connection("YOUR_RPC")
const tx = new Transaction()
const signature = await connection.sendRawTransaction(tx.serialize())

const latestBlockHash = await connection.getLatestBlockhash()
const confirmStrategy: BlockheightBasedTransactionConfirmationStrategy = {
    blockhash: latestBlockHash.blockhash,
    lastValidBlockHeight: latestBlockHash.lastValidBlockHeight,
    signature: signature
}
const result = await connection.confirmTransaction(confirmStrategy)

EDIT 1:

I tried:

  const sig = conn.sendRawTransaction(tx.serialize())
  console.log(sig);
  const latestBlockHash = conn.getLatestBlockhash();
  const txConfirmation = conn.confirmTransaction({
        blockhash: latestBlockHash.blockhash,
        lastValidBlockHeight: latestBlockHash.lastValidBlockHeight,
        signature: sig,
  });

But got this error:

throw new Error('signature must be base58 encoded: ' + rawSignature);

Answer 1

You're forgetting the await keywords as they're used in the example you're borrowing from. Failing to include them will make Javascript return a promise rather than waiting to receive the actual value you'd expect the function to return.