Callback won't be triggered

[medianetic]

Ive used the following script:

var sftp = require('node-sftp-deploy');
let config = {
"host": "example.com",
"port": "22",
"user": "example",
"pass": "test",
"remotePath": "/var/www/html/test/",
"sourcePath": "./dist/"
}

//Support Promise
sftp(config).then(function(){
//Success Callback
console.log("Finished");
});

Its copying the directory sucessfully, but the callback will never execute. The console just says: Authenticating with password.