Create Feature 2 - NgRx 13

reducer.ts

// `createFeature` is imported from `@ngrx/store`
import { createFeature, createReducer } from "@ngrx/store";

import * as BookListPageActions from "./book-list-page.actions";
import * as BooksApiActions from "./books-api.actions";

interface State {
  books: Book[];
  loading: boolean;
}

const initialState: State = {
  books: [],
  loading: false,
};

// feature name and reducer are now passed to `createFeature`
export const booksFeature = createFeature({
  name: "books",
  reducer: createReducer(
    initialState,
    on(BookListPageActions.enter, (state) => ({
      ...state,
      loading: true,
    })),
    on(BooksApiActions.loadBooksSuccess, (state, { books }) => ({
      ...state,
      books,
      loading: false,
    }))
  ),
});