const { ACHFilesApi, Configuration } = require('ach-node-sdk');

import { ACHFilesApi, Configuration } from 'ach-node-sdk';

const configuration = new Configuration({ basePath: 'https://ach.mycompany.com' });
const achFilesApi = new ACHFilesApi(configuration);

achFilesApi.getFiles().then(response => console.log(response.data));
=> Promise{ <pending> }
{ files: [], error: null };