isFullySignedTransaction

function isFullySignedTransaction<TTransaction>(
    transaction,
): transaction is FullySignedTransaction & TTransaction;

import { isFullySignedTransaction } from '@solana/transactions';
 
const transaction = getTransactionDecoder().decode(transactionBytes);
if (isFullySignedTransaction(transaction)) {
  // At this point we know that the transaction is signed and can be sent to the network.
}