Authentication with Redux + Redux Saga

Actions.jsx

export const actionCreators = {
  changeUser: user => ({
    type: actionTypes.USER_CHANGED,
    payload: user
  }),
  logout: () => ({
    type: actionTypes.LOGOUT
  }),
  fetchUser: () => ({
    type: actionTypes.FETCH_USER_REQUEST
  }),
  errorFetchingUser: () => ({
    type: actionTypes.FETCH_USER_REQUEST_ERROR
  })
};

Sagas.jsx

import { takeEvery, call, put } from "redux-saga/effects";
import { BugTracer } from "../../Services";
import { UserRequester } from "../../Requesters";

// $5
function* setBugtracerUser({ payload }) {
  yield call(BugTracer.setUser, payload);
}

// #4
function* fetchUser() {
  try {
    const response = yield call(UserRequester.fetchMe);
    yield put(actionCreators.changeUser(response.data));
  } catch (error) {
    yield put(actionCreators.errorFetchingUser(error));
  }
}

// #3
function* dispatchFetchUser() {
  yield put(actionCreators.fetchUser());
}

// #2
function* onTokenChange({ payload }) {
  axios.defaults.headers.common["Authorization"] = payload;
}

// #1
export default function*() {
  yield takeEvery(actionTypes.USER_CHANGED, setBugtracerUser);
  yield takeEvery(
    [actionTypes.ACCESS_TOKEN_CHANGED, actionTypes.LOGOUT],
    onTokenChange
  );
  yield takeEvery(actionTypes.ACCESS_TOKEN_CHANGED, dispatchFetchUser);
  yield takeEvery(actionTypes.FETCH_USER_REQUEST, fetchUser);
}