Pattern for importing/exporting a simple Javascript Module / Singleton from Ext.define()

Ext.module.js

//define a dependancy
Ext.define( 'My.dependancyModule', {
    
    //prevents unnecessary class construction methods
    singleton: true,

    //wrap logic scoped in self executing function
    module: (function(){

        //protected vars
        var myDependancy = 'dependancy';
        
        //return public members
        return {
            getMyDependancy: function(){
                return myDependancy;
            }
        };
    })()
}, function(){
    //use Ext.define callback to reset the object to just the module
    My.dependancyModule = this.module;
});

//gets the benefits of Ext loading while removing unnecessary Ext class members
Ext.define( 'My.exampleModule', {
    
    //load another simple module as a dependancy
    requires: ['My.otherModule'],
    
    //prevents unnecessary class construction methods
    singleton: true,

    //wrap logic scoped in self executing function
    module: (function(){

        //protected vars
        var myVar1 = 'my ',
            myVar2 = '';
        
        //return public members
        return {
            
            //public vars, functions, accessor methods
            myVar3: 'three',

            getMyVar1: function(){
                return myVar1;
            },
            getMyVar2: function(){
                return myVar2;
            },
            //access our dependancy
            writeSomething: function(){
                myVar2 = My.otherModule.getMyDependancy();
                console.log( myVar1 + myVar2);
            }
        };
    })()
}, function(){

    //use Ext.define callback to reset the object to just the module
    My.exampleModule = this.module;
});

My.exampleModule.writeSomething(); // 'my depndancy'