webpack/assets/javascripts/react_app/redux/API/APITestSetup.js
import axios from 'axios';
// a counter for active requests, like jQuery.active
window.axiosActive = 0;
axios.interceptors.request.use(config => {
window.axiosActive += 1;
return config;
});
axios.interceptors.response.use(response => {
window.axiosActive -= 1;
return response;
});