List all objects from s3 in nodejs with typescript

s3.ts

import { ListObjectsV2Command, type _Object } from "@aws-sdk/client-s3";

let size = 0;
let keys: _Object[] = [];

const BUCKET_NAME = "":
const OBJECTS_PREFIX = "";

async function fetchObjects(StartAfter?: string) {
  const listCmd = new ListObjectsV2Command({ Bucket: BUCKET_NAME, Prefix: OBJECTS_PREFIX, StartAfter });
  try {
    const data = await s3Client.send(listCmd);
    const totalSize = data.Contents?.reduce((a, b) => a + (b.Size ?? 0), 0) ?? 0;

    size = totalSize;
    keys = keys.concat(keys, data.Contents ?? [])

    if (data.IsTruncated && data.NextContinuationToken) {
      await fetchObjects(data.NextContinuationToken)
    }

  } catch (error) {
    console.error(error);
  }
}

// Here we call our function!
await fetchObjects();