Magento2 Use of Js Mixins

In Magento 2, js mixin is a wonderful concept to override/extend core js files. If we want to perform any action before executing any js script function or if want to extend a function or to modify any data without overwriting js, so mixin will be the best option for you.

In the following example, we are extending “Magento_Checkout/js/action/set-shipping-information” js file with our custom js “Company_Module/js/action/set-shipping-information-mixin” mixin file. To do that we need to create requirejs-config.js with following code given under directory path as app/code/Magemeta/Module/view/frontend:

var config = {
    config: {
        mixins: {
            'Magento_Checkout/js/action/set-shipping-information': {
                'Magemeta_Module/js/action/set-shipping-information-mixin': true

Next, we need to create set-shipping-information-mixin.js file under app/code/Magemeta/Module/view/frontend/web/js/action to extend original function. Here we are just appending some test data to shipping address in the following example of code snippet given:

 /*jshint browser:true jquery:true*/
 /*global alert*/
 ], function ($, wrapper, quote) {
     'use strict';
     return function (setShippingInformationAction) {
         return wrapper.wrap(setShippingInformationAction, function (originalAction) {
             var shippingAddress = quote.shippingAddress();
             if (shippingAddress['extension_attributes'] === undefined) {
                 shippingAddress['extension_attributes'] = {'customField':"testvalue"};
             // you can write here your code according to your requirement
             return originalAction(); // it is returning the flow to original action

Hope this will help you guys!!

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