Batch processing support for node.js

I am using sloc with my node.js code. Currently my code takes one file content at a time.

```
const {total, source} = sloc(content, extension);
```
How can I support batch processing to make it faster? I have requirement to process 1000+ files at a time. Batching will help. I am looking for something as below.
```
const [{total, source}] = sloc([content], [extension]);
```