_section: Transactions @<cookbook--transactions>

_subsection: Compute the raw transaction @<cookbook--compute-raw-transaction>

_code: @lang<javascript>

function getRawTransaction(tx) {
  function addKey(accum, key) {
    if (tx[key]) { accum[key] = tx[key]; }
    return accum;
  }

  // Extract the relevant parts of the transaction and signature
  const txFields = "accessList chainId data gasPrice gasLimit maxFeePerGas maxPriorityFeePerGas nonce to type value".split(" ");
  const sigFields = "v r s".split(" ");

  // Seriailze the signed transaction
  const raw = utils.serializeTransaction(txFields.reduce(addKey, { }), sigFields.reduce(addKey, { }));

  // Double check things went well
  if (utils.keccak256(raw) !== tx.hash) { throw new Error("serializing failed!"); }

  return raw;
}