Getting transaction info on account changes using JS

Question

Using JS, how would I go about getting transaction information on transactions that affect the balance of a specific account?

I've been able to listen for account changes with the following code, but it only provides the updated account information. Specifically, I want to know the amount of the transfer, what token was transferred, and what account it was transferred from.

import { clusterApiUrl, Connection, PublicKey } from '@solana/web3.js';

const connection = new Connection(clusterApiUrl('devnet'), 'confirmed');

const subscriptionID = connection.onAccountChange(
  new PublicKey('xxxxxxxxxxx'),
  (updatedAccountInfo, context) => {
    console.log(updatedAccountInfo, context)
  },
  "confirmed"
)

Answer 1

It's a bit goofy, but if you want the full transaction info on every update, you'll need to query the signatures for that address, and then fetch the transaction, so roughly that would be:

const subscriptionID = connection.onAccountChange(
  new PublicKey('xxxxxxxxxxx'),
  (updatedAccountInfo, context) => {
    const signatures = await connection.getSignaturesForAddress('xxxxxxx');
    const transaction = await connection.getTransaction(signatures[0].signature);
  },
  "confirmed"
)