mall-app/src/app/app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';

import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';

import { MallService } from './services/mall.service';

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { ServiceWorkerModule } from '@angular/service-worker';
import { environment } from '../environments/environment';

@NgModule({
    declarations: [AppComponent],
    entryComponents: [],
    imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule, ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production })],
    providers: [
        StatusBar,
        SplashScreen,
        MallService,
        { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
    ],
    bootstrap: [AppComponent]
})
export class AppModule { }