export const SIGN_UP_SUCCESS = 'SIGN_UP_SUCCESS';
export const SIGN_UP_FAILURE = 'SIGN_UP_FAILURE';
export const SIGNING_UP = 'SIGNING_UP';
export const LOGGING_IN = 'LOGGING_IN';
export const LOGIN_SUCCESS = 'LOGIN_SUCCESS';
export const LOGIN_FAILURE = 'LOGIN_FAILURE';
export const GET_BOOKS_SUCCESS = 'GET_BOOKS_SUCCESS';
export const GET_BOOKS_REQUEST = 'GET_BOOKS_REQUEST';
export const GET_BOOKS_FAILURE = 'GET_BOOKS_FAILURE';
export const GET_BOOK_SUCCESS = 'GET_BOOK_SUCCESS';
export const GET_BOOK_REQUEST = 'GET_BOOK_REQUEST';
export const GET_BOOK_FAILURE = 'GET_BOOK_FAILURE';
export const GET_UPVOTED_BOOKS_SUCCESS = 'GET_UPVOTED_BOOKS_SUCCESS';
export const GET_UPVOTED_BOOKS_REQUEST = 'GET_UPVOTED_BOOKS_REQUEST';
export const GET_UPVOTED_BOOKS_FAILURE = 'GET_UPVOTED_BOOKS_FAILURE';

export const SIGN_UP_SUCCESS = 'SIGN_UP_SUCCESS';
export const SIGN_UP_FAILURE = 'SIGN_UP_FAILURE';
export const SIGNING_UP = 'SIGNING_UP';
export const LOGGING_IN = 'LOGGING_IN';
export const LOGIN_SUCCESS = 'LOGIN_SUCCESS';
export const LOGIN_FAILURE = 'LOGIN_FAILURE';
export const GET_BOOKS_SUCCESS = 'GET_BOOKS_SUCCESS';
export const GET_BOOKS_REQUEST = 'GET_BOOKS_REQUEST';
export const GET_BOOKS_FAILURE = 'GET_BOOKS_FAILURE';
export const GET_BOOK_SUCCESS = 'GET_BOOK_SUCCESS';
export const GET_BOOK_REQUEST = 'GET_BOOK_REQUEST';
export const GET_BOOK_FAILURE = 'GET_BOOK_FAILURE';
export const GET_UPVOTED_BOOKS_SUCCESS = 'GET_UPVOTED_BOOKS_SUCCESS';
export const GET_UPVOTED_BOOKS_REQUEST = 'GET_UPVOTED_BOOKS_REQUEST';
export const GET_UPVOTED_BOOKS_FAILURE = 'GET_UPVOTED_BOOKS_FAILURE';
export const FAVORITE_REQUEST = 'FAVORITE_REQUEST';
export const FAVORITE_SUCCESS = 'FAVORITE_SUCCESS';
export const FAVORITE_FAILURE = 'FAVORITE_FAILURE';

Add action types to favorite a book