var AnyFS = require('anyfs');
var Adapter = require('anyfs-s3-adapter');
var adapter = new Adapter({
    "accessKeyId": "AWS access key",
    "secretAccessKey": "AWS secret",
    "region": "S3 region",
    "bucket": "S3 bucket"
});

var fs = new AnyFS(adapter);

fs.list('/dir', function(err, list) {
    console.log(list);
});