node copy files recursive async

copyRecursive.js

awaitable = (func, ...args) => {
     return new Promise(resolve => {
        func.apply(this, [...args, (...a) => {
            if(a.length === 1){
                return resolve(a[0]);
            }
            if(a.length === 2){
                return resolve(a[1]);
            }
            return resolve(a);
        }]);
    });
}
const copyRecursive = async (src, dest) => {
    const exists = await awaitable(fs.exists, src);
    const stats = exists && await awaitable(fs.stat, src);
    const isDirectory = exists && stats.isDirectory();
    if (isDirectory) {
        await awaitable(fs.mkdir, dest);
        const dir = (await awaitable(fs.readdir, src));
        for(const childItemName of dir){
            await copyRecursive(
                path.join(src, childItemName),
                path.join(dest, childItemName)
            );
        }
    } else {
        const readStream = fs.createReadStream(src);
        readStream.pipe(fs.createWriteStream(dest));
        await new Promise(resolve => {
            readStream.on('end', () => {
                resolve();
            });
        });
    }
};