How to get logged in username in RTC using script?

dojo.provide("com.example.IssueSubmitterNameTestValueProvider");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");
dojo.require("com.ibm.team.repository.web.client.session.Session");
(function() {               
              var getAuthenticatedContributor = com.ibm.team.repository.web.client.session.getAuthenticatedContributor;
            var loggedInUser = getAuthenticatedContributor().name;

 console.log("user :" +loggedInUser);

    dojo.declare("com.example.IssueSubmitterNameTestValueProvider", null, {

        getValue: function(attribute, workItem, configuration) {     

var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;
            var state = workItem.getLabel(WorkItemAttributes.STATE);     

return loggedInUser;
        }
      
    });

})();

The Highlighed code is working fine If I write before declare statement. It gives the Username in console. If I write the same code after  getValue: function(attribute, workItem, configuration)  then it is not working.

Is there any error in code?