text: export const API = 'API';
  export const RECEIVE_DATA = 'RECEIVE_DATA';
  export const ADD_CARD = 'ADD_CARD';
  export const UPDATE_CARD = 'UPDATE_CARD';
  export const DELETE_CARD = 'DELETE_CARD';
  export const FILTER_CARDS = 'FILTER_CARDS';
  export const SHOW_BACK_CARD = 'SHOW_BACK_CARD';
  export const ADD_DECK = 'ADD_DECK';
  export const SHOW_ADD_DECK = 'SHOW_ADD_DECK';
  export const HIDE_ADD_DECK = 'HIDE_ADD_DECK';
  
  