ydn-coupling-actions-reducers-reducer.ts

export function favoriteItemsReducer(state = initialState, action: Action) {
  switch(action.type) {
    case 'REMOVE_FAVORITE_ITEM':
    case 'DELETE_ITEM_SUCCESS':
      const itemId = action.payload;
      return state.filter(id => id !== itemId);
    default: 
      return state;
  }
}