import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.storage.buckets.usage.getBucketUsage('');

console.log(response.data);

{
  "data": [
    {
      "size": 123456,
      "size_kb": 123456,
      "num_objects": 123456,
      "timestamp": "2020-01-01T00:00:00Z"
    }
  ],
  "meta": {
    "page_number": 2,
    "total_pages": 3,
    "page_size": 25,
    "total_results": 55
  }
}