I am maintaining and extending an old project which was pre-AMD. I wish to add an Chart to the application. for this, I have created a js file as follows:

define(["dojox/charting/Chart",...."dijit/Dialog","dojo/dom-construct"],
    function (Chart) {

    function showDailyChart(data){
       //code to show the chart in a dialog
     }
    return customModules.singleChart;
});

I have saved this file as /customModules/singleChart.js

In My main HTML Page, I have added it to the packages as follows:

var dojoConfig = { parseOnLoad: true,
        packages: [....,{"name":"customModules",
             "location":location.pathname.replace(/\/[^/]+$/, "")+"/modules" }
                         ]};

The function from which I want to call it, is pre-AMD. So I am calling it as follows:

dojo.require("customModules.singleChart");
.
.
.
customModules.singleChart.showDailyChart(data);

I can see that /customModules/singleChart.js is loaded in the Firebug console as well as Net Tab. However there is no customModules.singleChart object. Strangely enough there is no error either. I have tested this in Firebug, as well as Google Chrome's developer tools.

What is the correct way to call an AMD Module using dojo.require? Or is there a better way to do what I need?