actions-index.js

export { default as login } from "./login";
export { default as auth } from "./auth";

actions-login.js

import { createActions } from "redux-actions";

const login = createActions({
  LOGIN: {
    REQUEST: (...payload) => payload,
    RESPONSE: payload => payload
  }
}).login;

export default login;

reducers-index.js

import { routerReducer } from "react-router-redux";
import { combineReducers } from "redux";

import loginReducer from "./loginReducer";

export default combineReducers({
  login: loginReducer,
  router: routerReducer
});

reducers-loginReducer.js

import { handleActions } from "redux-actions";
import { login } from "../actions";

export default handleActions(
  {
    [login.response().type]: (state, action) => {
      return {
        ...state,
        ...action.payload
      };
    }
  },
  {
    currentUser: undefined,
    error: undefined
  }
);

sagas-index.js

import {loginSaga} from "./loginSaga"
import {login} from "./actions"

function* Saga() {
  yield takeLatest(login.request().type, loginSaga);
  yield takeLatest(auth.request().type, authSaga);
}

export default Saga;

sagas-loginSaga.js

import { call, put, takeLatest } from "redux-saga/effects";

import { login } from "../actions";

import firebase from "_firebase";

function loginMock(email, password) {
  return new Promise((resolve, reject) => {
    firebase
      .auth()
      .signInWithEmailAndPassword(email, password)
      .catch(error => {
        reject(error);
      })
      .then(() => {
        const currentUser = firebase.auth().currentUser;
        resolve(currentUser);
      });
  });
}

function* loginSaga({ payload: { email, password } }) {
  try {
    // call : Promiseの完了を待つ
    const currentUser = yield call(loginMock, email, password);
    // put : Actionをdispatchする
    yield put(login.response({ currentUser: currentUser }));
  } catch (error) {
    // put : Actionをdispatchする
    yield put(login.response({ error: error }));
  }
}

export default loginSaga;