...
import { EffectsModule } from '@ngrx/effects';
import { RouterStateSerializer, StoreRouterConnectingModule } from '@ngrx/router-store';
import { MetaReducer, StoreModule } from '@ngrx/store';
import { StoreDevtoolsModule } from '@ngrx/store-devtools';
import { storeFreeze } from 'ngrx-store-freeze';
...
export const metaReducers: MetaReducer<any>[] = !environment.production ? [storeFreeze] : [];

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    ...
    StoreModule.forRoot(appReducer, { metaReducers }),
    EffectsModule.forRoot([]),
    StoreRouterConnectingModule,
    StoreDevtoolsModule.instrument(),
    ...
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }