text: export const FETCH_BOOKS = 'FETCH_BOOKS';
  export const FETCH_CATEGORIES = 'FETCH_CATEGORIES';
  export const FETCH_BOOK_INFO = 'FETCH_BOOK_INFO';
  export const ADD_TO_CART = 'ADD_TO_CART';
  export const REMOVE_FROM_CART = 'REMOVE_FROM_CART';
  export const EMPTY_CART = 'EMPTY_CART';
  export const INCREMENT_QUANTITY = 'INCREMENT_QUANTITY';
  export const DECREMENT_QUANTITY = 'DECREMENT_QUANTITY';
  export const AUTH_SIGN_UP = 'AUTH_SIGN_UP';
  export const AUTH_SIGN_IN = 'AUTH_SIGN_IN';
  export const AUTH_SIGN_OUT = 'AUTH_SIGN_OUT';
  export const AUTH_ERROR = 'AUTH_ERROR';
  export const EDIT_USER_PROFILE = 'EDIT_USER_PROFILE';
  export const FETCH_USER_PROFILE = 'FETCH_USER_PROFILE';
  export const SET_USER_ORDERS = 'SET_USER_ORDERS';
  export const SEARCH_BOOKS = 'SEARCH_BOOKS';
  export const SEARCH_BOOKS_INFO = 'SEARCH_BOOKS_INFO';