text: export const UPDATE_BOOKS = "UPDATE_BOOKS";
  export const UPDATE_SEARCH_BOOKS = "UPDATE_SEARCH_BOOKS";
  export const REMOVE_BOOK = "REMOVE_BOOK";
  export const SET_CURRENT_BOOK = "SET_CURRENT_BOOK";
  export const ADD_BOOK = "ADD_BOOK";
  export const LOADING = "LOADING";
  
  export const ADD_FAVORITE = "ADD_FAVORITE";
  export const REMOVE_FAVORITE = "REMOVE_FAVORITE";
  export const UPDATE_FAVORITES = "UPDATE_FAVORITES";
  