04-setting-up-the-store

src/app/shared/state/books.reducer.ts

@@ -1,4 +1,4 @@
-import { createReducer, on } from "@ngrx/store";
+import { createReducer, on, Action } from "@ngrx/store";
 import { BookModel } from "src/app/shared/models/book.model";
 import { BooksPageActions } from "src/app/books/actions";
 
@@ -35,3 +35,7 @@ export const booksReducer = createReducer(
     };
   })
 );
+
+export function reducer(state: State | undefined, action: Action) {
+  return booksReducer(state, action);
+}

src/app/shared/state/index.ts

@@ -1,8 +1,13 @@
 import { ActionReducerMap, createSelector, MetaReducer } from "@ngrx/store";
+import * as fromBooks from "./books.reducer";
 
-export interface State {}
+export interface State {
+  books: fromBooks.State;
+}
 
-export const reducers: ActionReducerMap<State> = {};
+export const reducers: ActionReducerMap<State> = {
+  books: fromBooks.reducer
+};
 
 export const metaReducers: MetaReducer<State>[] = [];