createConnectionModel.ts

const createConnectionModel = (config: any, refreshURL: string) => {
	const instance = axios.create(config);
	let refreshRequest: Promise<any>;

	const unauthorized = createEvent();

	/* если юзаете JWT без кук, что впрочем, я не рекомендую
	instance.interceptors.request.use((config) => {
		config.headers['auth'] = localStorage.getItem(...);
	})
	*/

	instance.interceptors.response.use(null, async (err: AxiosError) => {
		if(Number(err.code) === 401){
			if(!refreshRequest){
				refreshRequest = instance.get(refreshURL);
			}
			await refreshRequest.catch(unauthorized);

			return instance({...err.config, baseURL: ""})// иначе, baseURL прилепится дважды
		}
	})

	return {instance, unauthorized}
};

const {instance, unauthorized} = createConnectionModel({}, "/api/refresh_token");
unauthorized.watch(() => history.push('/login'));
instance.get('/api/user/current');