Axios Interceptor with Token Refresh

import axios from 'axios';
const api = axios.create({ baseURL: process.env.NEXT_PUBLIC_API_URL });
api.interceptors.request.use(cfg => {
  cfg.headers.Authorization = 'Bearer ' + localStorage.getItem('token');
  return cfg;
});
api.interceptors.response.use(null, async err => {
  if (err.response && err.response.status === 401) {
    await refreshToken();
    return api(err.config);
  }
  return Promise.reject(err);
});
export default api;