Mixins js do not appear when we open product links in a new tab

[Mecalux-Developer]

Preconditions (*)

1. Our ecommerce: Magento 2.3.4-p2
2. php version: 7.3.16
3. Database: Mysql 5.7
4. Varnish: 6.2.3
5. Elasticsearch: 6.8.7
6. Redis: 5.0.4
7. Apache: 2.4.6
8. Our website: https://www.shelvingdirect.com/

Steps to reproduce (*)

1. Create a mixin of some file on the product page. For example, override some method of the Magento_Catalog/js/price-box.js module
2. Go to the homepage of Magento
3. Move the mouse over a product. Right-click and click "open the page in a new tab" for several products in the homepage

Expected result (*)

1. We must see the mixin of price-box-mixin.min.js

2. The mixin file appears when we click directly on the product instead of the right button and open the link in a new tab

Actual result (*)

1. We see the price-box.min.js .The file price-box-mixin.min.js doesn't appear

---

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @Mecalux-Developer. Thank you for your report.
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• Information on your environment
• Steps to reproduce
• Expected and actual results

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[Mecalux-Developer]

I was able to reproduce it in Magento 2.3.4-p2 vainilla with sample data (Luma) in developer Mode without elasticsearch, varnish, redis.

Magento 2.3.4-p2 vainilla (Luma)

Click directly on the link of product in homepage

Right click on the link of product in homepage and open it in a new tab

We can see that the our custom mixin Mecalux_Ejemplo/js/price-box-mixin does not appears

Note:
Ejemplo is Example in English

[mrtuvn]

Have you add mixin declare in file requirejs-config ?
Check this doc https://devdocs.magento.com/guides/v2.4/javascript-dev-guide/javascript/js_mixins.html
Tried from my local setup with 2.4 latest code (github code) but can't reproduce like your describe
My test case: js minify: NO developer mode: ON not change much in settings admin
See image attach

[Mecalux-Developer]

@mrtuvn Thanks for your answer. We have the requirejs-config.js file created.
To reproduce this problem, we have to go to the home page, then right-click the mouse and open several products in a new browser tab

Sorry, I was wrong in the above message, I put the wrong version. I tested it on 2.3.4-p2 instead of 2.4. Could you try in Magento: 2.3.4-p2?

The folder structure of the example module is the following:

The content of the files is:

registration.php

<?php
    \Magento\Framework\Component\ComponentRegistrar::register(
        \Magento\Framework\Component\ComponentRegistrar::MODULE,
        'Mecalux_Ejemplo',
        __DIR__
    );

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="Mecalux_Ejemplo" setup_version="1.0.0"/>
</config>

price-box-mixin.js

define([
    'jquery',
    'Magento_Catalog/js/price-utils',
    'underscore',
    'mage/template',
    'jquery/ui'
], function ($, utils, _, mageTemplate) {
    'use strict';

    return function (priceBox) {
        $.widget('mage.priceBox', priceBox, {
            _setDefaultsFromDataSet: function _setDefaultsFromDataSet() {
               console.log("Hello world");
            },
        });

        return $.mage.priceBox;
    };
});

requirejs-config.js

var config = {
    config: {
        mixins: {
            'Magento_Catalog/js/price-box': {
                'Mecalux_Ejemplo/js/price-box-mixin': true
            }
        }
    }
};

[Mecalux-Developer]

@mrtuvn It seems the problem is fixed in 2.4. We have not been able to reproduce this problem in 2.4 either. But we have been able to reproduce this problem in 2.3.4-p2 LUMA (Vainilla). Is there a solution for this version(2.3.4-p2)? We plan to update our magento later. Not now.

[mrtuvn]

Don't know but from my knowleadges in 2.4 magento brings update with some improvements in JavaScript . Mixin module has been refactored to improve the loading and application of mixins for advanced bundled modules. But consider update maybe risky for live site running. We can't know problem something went wrong when some 3rd-party modules may breaks compatible

[Mecalux-Developer]

@mrtuvn Thanks for your reply,
We urgently need a fix for this version (2.3.4-p2). Can you review this case? Some patch etc.
We are really concerned that mixins will not work when we open the pages in a new tab with the right mouse button.
Thanks again, Regards

[mrtuvn]

check a couple PRs
#27690
#25869
#25587