walkasync.js

// List all files in a directory in Node.js recursively in an asynchronous fashion
let walkAsync = async(dir, filelist)=> {
  
    if( dir[dir.length-1] != '/') dir=dir.concat('/')
  
    let fse = fse || require('fs-extra'),
        files = await fse.readdir(dir);  
    filelist = filelist || [];
    for (let file of files) {
        if ((await fse.stat(dir + file)).isDirectory()) {
            filelist = await walkSync(dir + file + '/', filelist);
        }
        else {
            filelist.push(dir+file);
        }
    }
    return filelist;
};