console.log('URL_TEST_AJAX_ACTION:', URL_TEST_AJAX_ACTION) if (!URL_TEST_AJAX_ACTION) { throw "Brak zmiennej URL_TEST_AJAX_ACTION" } global.fetch(URL_TEST_AJAX_ACTION, { // @doc https://github.com/github/fetch credentials: 'same-origin', // or 'include' for CORS }).then(function (response) { return response.json() }).then(function (data) { console.log('data', data) }).catch(function (e) { console.warn('Error', e) })