npm i @ngrx/{store,effects,entity,router-store}

ng add @ngrx/store-devtools

npm i @ngrx/{schematics,store-devtools} ngrx-store-freeze --save-dev

app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { StoreDevtoolsModule } from '@ngrx/store-devtools';
import { ActionReducerMap, MetaReducer, StoreModule } from '@ngrx/store';
import { storeFreeze } from 'ngrx-store-freeze';
​
import { AppComponent } from './app.component';
import { HelloComponent } from './hello.component';
​
import { environment }  from '../environment/environment';
import { UserService } from './core/services/user.service';
​
export interface State {
  // states
}
​
export const storeDevTools = !environment.production ? StoreDevtoolsModule.instrument() : [];
​
export const metaReducers: MetaReducer<State>[] = !environment ? [storeFreeze] : [];
​
export const reducers: ActionReducerMap<State> = {
  // reducers
}
​
@NgModule({
  imports: [ 
    BrowserModule, 
    FormsModule, 
    StoreModule.forRoot(reducers, { metaReducers }),
    storeDevTools 
  ],
  declarations: [ AppComponent, HelloComponent ],
  bootstrap:    [ AppComponent ],
  providers: [UserService]
})
export class AppModule { }
​