app.module file after including all packages and services required for app

app.module.ts

import { PdfViewerService } from "./services/pdf-viewer.service";
import { FileOpener } from "@ionic-native/file-opener/ngx";
import { File } from "@ionic-native/file/ngx";
import { FileTransfer } from "@ionic-native/file-transfer/ngx";
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 { AppComponent } from "./app.component";
import { AppRoutingModule } from "./app-routing.module";

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule],
  providers: [
    StatusBar,
    SplashScreen,
    FileTransfer,
    FileOpener,
    File,
    PdfViewerService,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}