title: How to import File in IONIC 3?
body: <p>I have a strange pb with the add of file module in app.module.ts</p>
  
  <p>I have already install and the plugin with this command line:</p>
  
  <pre><code>ionic cordova plugin add cordova-plugin-file
  npm install @ionic-native/file
  </code></pre>
  
  <p>But when I decide to make a <code>import { File } from '@ionic-native/file';</code> and add the File on <code>@NgModule({  providers: [File] });</code> I get a strange error.</p>
  
  <p>You can show on this picture my error.</p>
  
  <p><a href="https://i.stack.imgur.com/WclQw.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <pre><code>SOMEONE CAN HELP ME PLEASE TO SOLVE THIS ?
  
  import { FileOpener } from '@ionic-native/file-opener/ngx';
  import { File } from '@ionic-native/file'; 
  // import { HttpClientModule } from '@angular/common/http';
  // import { HttpModule } from '@angular/http';
  
  import { BluetoothSerial } from '@ionic-native/bluetooth-serial/ngx';
  import { Toast } from '@ionic-native/toast/ngx';
  
  
  @NgModule({
  declarations: [
  MyApp,
  HomePage,
  ],
  imports: [
   BrowserModule,
   // HttpModule,
   IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
   MyApp,
   HomePage
  ],
  providers: [
   File,
   StatusBar,
   BluetoothSerial,
   SplashScreen,
   Printer,
   Toast,
   FileOpener,
  
  {provide: ErrorHandler, useClass: IonicErrorHandler},
  ]
  })
  </code></pre>