Restrict exposed types from platform interface

Author: mvanbeusekom

packages/camera/camera/example/lib/main.dart

@@ -11,6 +11,7 @@ import 'package:camera/camera.dart';
 import 'package:flutter/material.dart';
 import 'package:video_player/video_player.dart';
 
+
 class CameraExampleHome extends StatefulWidget {
   @override
   _CameraExampleHomeState createState() {

packages/camera/camera/lib/camera.dart

@@ -6,4 +6,10 @@ export 'src/camera_controller.dart';
 export 'src/camera_image.dart';
 export 'src/camera_preview.dart';
 
-export 'package:camera_platform_interface/camera_platform_interface.dart';
+export 'package:camera_platform_interface/camera_platform_interface.dart'
+    show
+        CameraDescription,
+        CameraException,
+        CameraLensDirection,
+        ResolutionPreset,
+        XFile;

packages/camera/camera/test/camera_test.dart

@@ -6,6 +6,7 @@ import 'dart:async';
 import 'dart:ui';
 
 import 'package:camera/camera.dart';
+import 'package:camera_platform_interface/camera_platform_interface.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';