recursiveReaddir.js

const readdirRecursively = async (dir, files = []) => {
    const dirents = await fsPromises.readdir(dir, {withFileTypes: true});
    const dirs = [];
    for (let dirent of dirents) {
        if (dirent.isDirectory()) dirs.push(`${dir}/${dirent.name}`);
        if (dirent.isFile()) files.push(`${dir}/${dirent.name}`);
    }
    for (let d of dirs) {
        files = readdirRecursively(d, files)
    }
    return Promise.resolve(files);
};