Close Solana token accounts and recover rent

unrent.js

import 'dotenv/config';
import { Connection } from '@solana/web3.js';
import { Keypair, Transaction, ComputeBudgetProgram } from '@solana/web3.js';
import { TOKEN_PROGRAM_ID, createCloseAccountInstruction } from '@solana/spl-token';
import bs58 from 'bs58';

const chunks = (array, chunkSize = 20) => {
    let res = [];
    for (let currentChunk = 0; currentChunk < array.length; currentChunk += chunkSize) {
      res.push(array.slice(currentChunk, currentChunk + chunkSize));
    }
    return res;
};

const wallet = Keypair.fromSecretKey(bs58.decode(process.argv[2] ?? process.env.PRIVATE_KEY));

const connection = new Connection("https://api.mainnet-beta.solana.com");
const tokenAccounts = await connection.getParsedTokenAccountsByOwner(wallet.publicKey, { programId: TOKEN_PROGRAM_ID });
const filteredAccounts = tokenAccounts.value.filter(account => account.account.data.parsed.info.tokenAmount.uiAmount === 0);

let i = 0;

const chs = chunks(filteredAccounts);
for (const chunk of chs) {
    const recentBlockhash = (await connection.getLatestBlockhash()).blockhash;
    const txn = new Transaction();
    const addPriorityFee = ComputeBudgetProgram.setComputeUnitPrice({
        microLamports: 100000,
    });
    txn.add(addPriorityFee);
    chunk.forEach(async (account) => {
        txn.feePayer = wallet.publicKey;
        txn.recentBlockhash = recentBlockhash;
        txn.add(createCloseAccountInstruction(account.pubkey, wallet.publicKey, wallet.publicKey));
    });
    txn.sign(wallet);
    const serializedTransaction = txn.serialize();
    await connection.sendRawTransaction(serializedTransaction);
    i += chunk.length;
    console.log(`Closed ${i}/${filteredAccounts.length} accounts`);
    await new Promise(resolve => setTimeout(resolve, 3000));
}