How do I parse the accounts in a versioned Transaction?

Question

Say I have given a versioned transaction and I want to get the accounts in the same format my smart contract will see it in. How do I do this?

Edit: I've tried the below, but this always gives me Error: Failed to get account keys because address table lookups were not resolved, which makes sense since this is a synchronous method and I didn't fetch the LUTs onchain anywhere else.

const allAccs = transaction.message.getAccountKeys().keySegments().reduce((acc, cur) => acc.concat(cur), []);

Answer 1

Figured it out. If our transaction is tx, we can just do:

const LUTs = (await Promise.all(transaction.message.addressTableLookups
    .map((acc) => conn.getAddressLookupTable(acc.accountKey))))
    .map((lut) => lut.value).filter((val) => val !== null) as AddressLookupTableAccount[];
const allAccs = transaction.message.getAccountKeys({ addressLookupTableAccounts: LUTs })
    .keySegments().reduce((acc, cur) => acc.concat(cur), []);

Answer 2

Code:

    const tx = await connection.getParsedTransaction(
    "3PF85bjev6h7ydKyKpwLyw9R7jq2A9PdzRjtuhbzjKXgLZgdFcXWKZK89KSdes2qu4kWsBXgk6srsHDFpnfEoCEH",
    {
        maxSupportedTransactionVersion: 0
    }
);
console.log(tx.transaction.message.accountKeys);