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Debugging dojo

Recently I had an issue where I always get 3 as callback whenever I require a custom module.
 require(["modules/headerWidget"],function(header){  
                console.log(header);  
 });

My headerWidget is something like this:
 require([ "dojo/_base/declare" , "dijit/_WidgetBase", "dijit/_TemplatedMixin" ],  
           function(declare, _WidgetBase, _TemplatedMixin) {  
                return declare("headerWidget",[ _WidgetBase, _TemplatedMixin ],{  
                     templateString : <div></div> ,  
                });
 });

Console always used to display only 3. I wondered as to why and here is the solution for that.

The Dojo Loader will also pass the number 3 to the callback in place of the module. 3 is the Dojo AMD loader code for attempting to load a non-module.
The solution is to give the custom widget as module.
 define([ "dojo/_base/declare" , "dijit/_WidgetBase", "dijit/_TemplatedMixin" ],   
       function(declare, _WidgetBase, _TemplatedMixin) {   
         return declare("headerWidget",[ _WidgetBase, _TemplatedMixin ],{   
            templateString : <div></div> ,   
         });  
  });

Source: Debugging dojo.
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