valore undefined in call back promise

[U235]

Ciao a tutti
Ho questo script:

function result(){
let myPromise = new Promise(function(resolve, rejiect) {
            resolve(xajax(formdata, "/script/playlist.php"));
        });


        myPromise.then(
            function(value) {
                alert(value);


            },
            function(error) {
                alert(error);
            },


        );
}


function xajax(formdata, url) {
    $.ajax({
        url: url,
        data: formdata,
        method: "POST",
        contentType: false,
        processData: false,
        success: function(response) {
            return response;
        },
        error: function(response) {
            return response;
        }
    });
}

perche in alert mi da sempre undefined?

Ciao,
credo che tu voglia fare una cosa del genere:

function xajax(formdata, url) {
      return new Promise((resolve, rejiect)=> {
             $.ajax({
                  url: url,
                  data: formdata,
                  method: "POST",
                  contentType: false,
                  processData: false,
                  success: function(response) {
                      resolve(response);
                  },
                  error: function(response) {
                      rejiect(response);
                  }
                });
              });   
}
....
....
xajax(formData,"/script/playlist.php")
       .then((value)=> alert(value))
       .catch((error)=> alert(error));