Simple javascript module declaration

moduleName.js

const moduleName = ((wnd,doc,$)=>{
    'use strict';
    const onReady = (callback)=>{
        if (doc.readyState !== "loading")
            callback();
        else
            doc.addEventListener("DOMContentLoaded", callback);
    }

    onReady(()=>{
    }
    );

    function xFunction() {}

    return {
        publicFunction: xFunction
    }

}
)(window, document, jQuery);