First I set the variable tokenArray:

const tokenArray = [
    '<token contract address 1>',
    '<token contract address 2>',
    '<token contract address 3>',
    etc...
]

I have this function:

async getTokens() {
        const ownerAddr = this.account;
        const balances = await this.web3.alchemy.getTokenBalances(ownerAddr, tokenArray, process.env.BLOCK_NUMBER)
        return balances

And I run it like this:

getTokens().then(function (result) {
    console.log(result);

The function will then return all of my current token balances but not my token balances as of the specified block height, followed by this error.

/Users/<myusername>/Desktop/Dev/token-balance-through-time/node_modules/@alch/alchemy-web3/dist/cjs/util/promises.js:28
        callback(null, result);
        ^

TypeError: callback is not a function
    at /Users/<myusername>/Desktop/Dev/token-balance-through-time/node_modules/@alch/alchemy-web3/dist/cjs/util/promises.js:28:9
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
<myusername>@<mycomputername> token-balance-through-time % 

How do I call getTokenBalances at a particular block height? BTW getTokenBalances is from @alch/alchemy-web3 and imported at the top of the file like this. const { createAlchemyWeb3 } = require('@alch/alchemy-web3');