Wrong shipping mixin extension_attributes retrieval

In https://github.com/Paazl/magento2-checkout-widget/blob/master/view/frontend/web/js/checkout/action/set-shipping-information-mixin.js

/**
 * Copyright © 2019 Paazl. All rights reserved.
 * See COPYING.txt for license details.
 */

/**
 * Updates current quote's shipping method with data from server.
 *      Reason: after shipping option is selected,
 *              JS object of the quote still contains old "method_title"
 */
define(
    [
        'underscore',
        'Magento_Checkout/js/model/quote',
        'widgetConfig'
    ],
    function (
        _,
        quote,
        widgetConfig
    ) {
        return function (target) {
            return function () {
                return target().done(function (res) {
                    var shippingMethod = quote.shippingMethod();
                    if (widgetConfig.prototype.getCarrierCode() !== shippingMethod.carrier_code
                        || widgetConfig.prototype.getMethodCode() !== shippingMethod.method_code) {
                        return;
                    }

                    var methods = res.extension_attributes && res.extension_attributes.shipping_methods || [];
                    var found = _.find(methods, function (m) {
                        return m.carrier_code === shippingMethod.carrier_code
                            && m.method_code === shippingMethod.method_code;
                    });

                    found && quote.shippingMethod(found);
                })
            }
        }
    }
);

the methods are retrieved by res.extension_attributes. However the extension_attributes are not at the top level in the response:

payment_methods: (3) [{…}, {…}, {…}]
totals: {grand_total: 7.39, base_grand_total: 8.94, subtotal: 3.3, base_subtotal: 3.3, discount_amount: 0, …}
[[Prototype]]: Object

The extension_attributes are in the totals. So I guess the res.extension_attributes should be changed to: res.totals.extension_attributes:

console.log(res.totals.extension_attributes):
base_reward_currency_amount: 0
reward_currency_amount: 0
reward_points_balance: 0
shipping_methods: [{…}]

So change it to:

return function (target) {
            return function () {
                return target().done(function (res) {
                    var shippingMethod = quote.shippingMethod();
                    if (widgetConfig.prototype.getCarrierCode() !== shippingMethod.carrier_code
                        || widgetConfig.prototype.getMethodCode() !== shippingMethod.method_code) {
                        return;
                    }

                    var methods = res.totals.extension_attributes && res.totals.extension_attributes.shipping_methods || []; <<<<<<-----
                    var found = _.find(methods, function (m) {
                        return m.carrier_code === shippingMethod.carrier_code
                            && m.method_code === shippingMethod.method_code;
                    });

                    found && quote.shippingMethod(found);
                })
            }
        }
    }

Paazl / magento2-checkout-widget

Wrong shipping mixin extension_attributes retrieval #69