Laravel 5.4 ajax request returns empty array

good day . im try to ajax my form submission heres the code

 var data = new FormData();
 data.append("test","testvar");
 var opt = {
    url:"",
    type:'POST',
    headers: {'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')},
    data:data,
    async:true,
    processData: false,
    success:function(result){
      console.log(result);
    }
  };
  if(data.fake) {
          // Make sure no text encoding stuff is done by xhr
          opt.xhr = function() { var xhr = jQuery.ajaxSettings.xhr(); xhr.send = xhr.sendAsBinary; return xhr; }
          opt.contentType = "multipart/form-data; boundary="+data.boundary;
          opt.data = data.toString();
      }
 $.ajax(opt);

controller part :

 public function store(Request $request)
{
 dd($request->all());
}

returns [] on network tab

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