newsupernova/vendor/vertex/module-tax/view/frontend/web/js/model/set-checkout-messages.js

/**
 * @copyright  Vertex. All rights reserved.  https://www.vertexinc.com/
 * @author     Mediotype                     https://www.mediotype.com/
 */

define(
    [
        'underscore',
        'Magento_Customer/js/customer-data',
        'Magento_Ui/js/model/messageList'
    ],
    function (_, customerData, messageContainer) {
        'use strict';

        /**
         * A utility for observing message updates in session storage. It is designed to subscribe to
         * customer data updates and forward messages to the appropriate messageList model.
         */
        return function () {
            var typeMap = {
                    'success': 'addSuccessMessage',
                    'warning': 'addErrorMessage',
                    'error': 'addErrorMessage'
                },

                /**
                 * Observe message section data changes and forward to the error processor.
                 * @param {Object} data - The observable payload.
                 * @return void
                 */
                messageSubscriptionCallback = function (data) {
                    if ('messages' in data) {
                        _.each(data.messages, function (message) {
                            if (message.type in typeMap) {
                                messageContainer[typeMap[message.type]]({
                                    'message': message.text
                                });
                            }
                        });
                    }
                };

            customerData.get('messages').subscribe(messageSubscriptionCallback);
        };
    }
);