import {
    AddressesByLookupTableAddress,
    createSolanaRpc,
    Address,
    address
} from "@solana/web3.js";
import { fetchAddressLookupTable } from "@solana-program/address-lookup-table";

export async function getAlt(rpc: any, alt: Address) {
    const altAccount = await fetchAddressLookupTable(rpc, alt);

    const addressesByLookupTableAddress: AddressesByLookupTableAddress = {};
    addressesByLookupTableAddress[alt] = altAccount.data.addresses;

    return addressesByLookupTableAddress;
}

const main = async () => {
    const rpc = createSolanaRpc('https://api.devnet.solana.com');

    const result = await getAlt(rpc, address('24uisJYVAt3NhdeyAVJA1y5MERAia42LTTLiRGtrQNmw'))
    console.log("Success:", result);
}
main();

// define the `PublicKey` of the lookup table to fetch
const lookupTableAddress = new web3.PublicKey("");
 
// get the table from the cluster
const lookupTableAccount = (
  await connection.getAddressLookupTable(lookupTableAddress)
).value;
 
// `lookupTableAccount` will now be a `AddressLookupTableAccount` object
 
console.log("Table address from cluster:", lookupTableAccount.key.toBase58());

// loop through and parse all the addresses stored in the table
for (let i = 0; i < lookupTableAccount.state.addresses.length; i++) {
  const address = lookupTableAccount.state.addresses[i];
  console.log(i, address.toBase58());
}