npm ftp + npm util-promisifyall: Read directory and subfolders recursively

client.js

/**
* Install dependencies with npm:
* npm i ftp
* npm i util-promisifyall
*/
const promisifyAll = require('util-promisifyall');
const Client = require('ftp');

/** 
* CONFIGURE YOUR OWN FTP !
*/
const config = {
    host: process.env.FTP_HOST,
    port: process.env.FTP_PORT || 21,
    user: process.env.FTP_USER,
    password: process.env.FTP_PASSWORD,
};

let client = new Client();
client = promisifyAll(client);

client.autoConnect = async () => {
    await client.connect(config);
    return new Promise(resolve => {
       client.on('ready', _ => resolve());
    });
};

client.recursiveList = async (path) => {
    if (!this.filelist)
        this.filelist = [];

    const rootList = await client.listAsync(path);

    const promises = await rootList.map(file => {
        return new Promise((resolve) => {
            let filePath = `${path}/${file.name}`;
            if (file.type === 'd') {
                resolve(client.recursiveList(filePath));
            } else {
                file.parentDir = filePath.replace(file.name, '');
                file.path = filePath;
                this.filelist.push(file);
                resolve();
            }
        });
    });

    await Promise.all(promises);
    return this.filelist;
};

module.exports = client;

index.js

const client = require('./client');

// Call with async await
(async () => {
    await client.autoConnect();
    const remoteFiles = await client.recursiveList('/home');
    remoteFiles.forEach(file => console.log(file.path));
})();

//  Or call with .then()
(() => {
    client.autoConnect().then(_ => {
        client.recursiveList('/home').then(remoteFiles => {
            remoteFiles.forEach(file => console.log(file.path));
        });
    });
})();