how to get the value from deferred javascript function (Magento 2.4)?

Question

I copy the js code from How to check that customer is logged in on frontend in Magento 2.1? I have defined the js code on my javascript, but I do not how to get the return value. How to get the return value?

/**
 * ****/js/check_login.js
 */
define(
 ['jquery', 'Magento_Customer/js/customer-data'],
 function (,ドル customerData) {
 'use strict';
 var getCustomerInfo = function () {
 var customer = customerData.get('customer');
 return customer();
 };
 var isLoggedIn = function (customerInfo) {
 customerInfo = customerInfo || getCustomerInfo();
 return customerInfo && customerInfo.firstname;
 };
 return function () {
 var deferred = $.Deferred();
 var customerInfo = getCustomerInfo();
 if (customerInfo && customerInfo.data_id) {
 deferred.resolve(isLoggedIn(customerInfo));
 } else {
 customerData.reload(['customer'], false)
 .done(function () {
 deferred.resolve(isLoggedIn());
 })
 .fail(function () {
 deferred.reject();
 });
 }
 return deferred;
 };
 }
);

define([
 'uiComponent',
 'jquery',
 'Magento_Ui/js/modal/modal',
 'Magento_Customer/js/customer-data',
 'Vendor_Module/js/check_login'
], function (Component, ,ドル modal, storage, checklogin) {
 'use strict';
 console.log(checklogin());

Answer 1

I managed to get what I needed

define([
 'uiComponent',
 'jquery',
 'Magento_Ui/js/modal/modal',
 'Magento_Customer/js/customer-data',
 'Vendor_Module/js/check_login'
], function (Component, ,ドル modal, storage, checklogin) {
 'use strict';
 var getLogin = checklogin();
 // firstname is the return value from check_login.js
 getLogin.then(function(firstname){
 // you code here
 });
});

Answer 2

<div class="text-account text-hidden" data-bind="scope: 'customer'">
 <!-- ko if: customer().firstname -->
 <span class="logged-in"
 data-bind="text: new String('<?= $block->escapeHtml(__('Hello!, %1', '%1')) ?>').replace('%1', customer().firstname)">
 </span>
 <!-- /ko -->
 <!-- ko ifnot: customer().firstname -->
 <?php echo __('Hello! Sign in'); ?>
 <!-- /ko -->
 <script type="text/x-magento-init">
 {
 "*": {
 "Magento_Ui/js/core/app": {
 "components": {
 "customer": {
 "component": "Magento_Customer/js/view/customer"
 }
 }
 }
 }
 }
 </script>
</div>

i used to check login this way