Async load list of files from directory, with optional extensions filtering and natural sort in nodejs

asyncDirListNaturalSort.js

// asyncDirListNaturalSort.js

const path = require('path')
const fs = require('fs')

/**
 * Asynchronous load list of files from directory,
 *  - with optional extensions filtering and natural sort
 *
 * @param {string} dirPath directory path to folder
 * @param {array} extFilter extentions to filter, with dots
 * @param {bool} sort enable natral sort on the returned list
 */
const readDir = (dirPath, extFilter, sort) => {
    return new Promise((resolve, reject) => {
        fs.readdir(dirPath, (err, files) => {
            if (err) return reject(err)

            // filter list
            if (extFilter && extFilter.length) files = files.filter(element => extFilter.includes(path.extname(element)))

            // sort list
            if (sort) {
                files = files.sort((new Intl.Collator(undefined, {
                    numeric: true,
                    sensitivity: 'base'
                })).compare)
            }

            resolve(files)
        });
    })
}

/**
 * Example/s
 *
 * node asyncDirListNaturalSort.js ./some/folder/path/to/images
 */

const pathSupplied = path.join(__dirname, process.argv[2])
const extFilter = ['.jpg', '.png', '.gif']

// using async/await
;(async () => {
    try {
        let list = await readDir(pathSupplied, extFilter, true)
        console.log(list)
    } catch (e) {
        console.error(e)
    }
})()

// using promise
readDir(pathSupplied, extFilter, true).then(list => {
    console.log(list)
}).catch(e => {
    console.error(e)
})