Magento 2 Override JS of a module but on first request dependencies not loading

Question

I want to change the HTML layout of a 3rd party module which is displaying INC/DEC buttons on the quantity input field on the product description page.

For that, I have to override a JS of a 3rd party module which I did and is working all fine.

The issue is that on the first request with an empty cache, it's dependencies are not loading and giving the following error:

TypeError: $.widget is not a function (\app\code\MyCompany\General\view\frontend\web\js\qtycontrol.js)
TypeError: $(...).qtycontrol is not a function (where it has been called)

Refreshing the page once, making it work fine.

Please find the details below of the code of the module I created to override and also of the original 3rd party module.

Override Module (\app\code\MyCompany\General\view\frontend\web\js\qtycontrol.js):

;define([
    'jquery',
    'jquery/ui'],
(function ($, window, document, undefined) {
    $.widget("infortis.qtycontrol", {
        , _create: function()
        {
            this._initPlugin();
        }
        , _initPlugin: function()
        {
            //Exetnded code to display inc/dec buttons on the quantity input field but with changes in HTML.
        }
    }); //end: widget
})(jQuery, window, document));

Override Module (\app\code\MyCompany\General\view\frontend\requirejs-config.js):

var config = {
    map: {
        '*': {
            'qtycontrol': 'MyCompany_General/js/qtycontrol'
        }
    }
};

Override Module (\app\code\MyCompany\General\etc\module.xml):

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="MyCompany_General" setup_version="1.0.0">
        <sequence>
            <module name="Infortis_Base"/>
        </sequence>
    </module>
</config>

3rd Party original module (\app\code\Infortis\Base\view\frontend\web\js\qtycontrol.js):

;(function ($, window, document, undefined) {
    $.widget("infortis.qtycontrol", {
        , _initPlugin: function()
        {
            //Some code to display inc/dec buttons on the quantity input field.
        }
    }); //end: widget
})(jQuery, window, document);

3rd Party original module (\app\code\Infortis\Base\view\frontend\requirejs-config.js):

var config = {
    paths: {
        'qtycontrol': 'Infortis_Base/js/qtycontrol'
    },
    shim: {
        'qtycontrol': {
            deps: ['jquery', 'jquery/ui']
        }
    }
};

I am running the application with the following environment:

• Operating system => Windows.
• Package => WAMP

As I am new to Magento 2 but well aware of PHP and basic JavaScript concepts. But it's possible that might missing some basic concept. Any help would be appreciated.

Answer 1

Magento recommends using mixins instead of overriding the entire JS file.

You can go the link there is an example also given, I believe that will help.