Create root app state module

src/app/app.config.ts

@@ -1,15 +1,23 @@
 import {
 	ApplicationConfig,
+	importProvidersFrom,
 	isDevMode,
 	provideBrowserGlobalErrorListeners,
 	provideZonelessChangeDetection,
 } from '@angular/core';
+import { StoreModule } from '@ngrx/store';
 import { provideStoreDevtools } from '@ngrx/store-devtools';
+import { appStateReducer } from './state/state.reducer';
 
 export const appConfig: ApplicationConfig = {
 	providers: [
 		provideBrowserGlobalErrorListeners(),
 		provideZonelessChangeDetection(),
+		importProvidersFrom(
+			StoreModule.forRoot({
+				app: appStateReducer,
+			})
+		),
 		provideStoreDevtools({
 			maxAge: 25,
 			logOnly: !isDevMode(),

src/app/app.ts

@@ -1,4 +1,6 @@
 import { Component } from '@angular/core';
+import { StoreModule } from '@ngrx/store';
+import { appStateReducer } from './state/state.reducer';
 
 @Component({
 	selector: 'app-root',

src/app/state/state.reducer.ts

@@ -0,0 +1,7 @@
+import { createReducer } from '@ngrx/store';
+
+export interface AppState {}
+
+export const initialState: AppState = {};
+
+export const appStateReducer = createReducer(initialState);