Axios config object is possibly 'undefined'?

Question

typescript

const $api = axios.create({
  withCredentials: true,
  baseURL: API_URL,
})

$api.interceptors.request.use((config:AxiosRequestConfig) => {
  config.headers.Authorization = `Bearer ${localStorage.getItem('token')}`
  return config
})

Answer 1

(config.headers ??= {}).Authorization = `Bearer ${localStorage.getItem('token')}`