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Magento 2: Extend mixin with mixin in custom theme

Input data

  • initial widget Magento_Theme/js/view/breadcrumbs (vendor/magento/module-theme/view/frontend/web/js/view/breadcrumbs.js)
  • native mixin that extends this widget: Magento_Catalog/js/product/breadcrumbs (vendor/magento/module-catalog/view/frontend/web/js/product/breadcrumbs.js)


Extend methods of the mixin Magento_Catalog/js/product/breadcrumbs


  • Declare your mixin in custom theme app/design/frontend/[Vendor]/[theme]/Magento_Catalog/requirejs-config.js file and associate it with the initial widget
var config = {
    config: {
        mixins: {
            'Magento_Theme/js/view/breadcrumbs': {
                'Magento_Catalog/js/product/breadcrumbs-mixin': true
  • In your custom mixin file app/design/frontend/[Vendor]/[theme]/Magento_Catalog/web/js/product/breadcrumbs-mixin.js define target mixin in define section
], function ($) {
    'use strict';
    return function (widget) {
        $.widget('mage.breadcrumbs', widget, {
             * {@inheritdoc}
            _getCategoryCrumb: function (menuItem) {
                //do some custom stuff
                return this._super(menuItem);
        return $.mage.breadcrumbs;
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Eddcapone commented Sep 21, 2021

How does it work with components?

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