import { StoreDevtoolsModule } from '@ngrx/store-devtools';
@NgModule({
  imports: [
    StoreModule.provideStore(rootReducer),
    // Note that you must instrument after importing StoreModule
    StoreDevtoolsModule.instrumentOnlyWithExtension({
      maxAge: 5
    })
  ]
})
export class AppModule { }

import {StoreDevtoolsModule} from '@ngrx/store-devtools';
@NgModule({
  imports: [
    StoreModule.provideStore(rootReducer),
    // Note that you must instrument after importing StoreModule
    StoreDevtoolsModule.instrumentStore({
      maxAge: 5,
      monitor: monitorReducer
    })
  ]
})
export class AppModule { }