isSendableTransaction

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

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