Fixed Flutter analysis issues

lib/src/web/flutter_qr_web.dart

@@ -56,7 +56,6 @@ class _WebQrViewState extends State<WebQrView> {
   // html.CanvasElement canvas;
   // html.CanvasRenderingContext2D ctx;
   bool _currentlyProcessing = false;
-  html.MediaRecorder? _mediaRecorder;
 
   QRViewControllerWeb? _controller;
 
@@ -73,10 +72,6 @@ class _WebQrViewState extends State<WebQrView> {
 
   Timer? _frameIntervall;
 
-  final _canvasKey = GlobalKey();
-
-  double _scaleFactor = 1;
-
   @override
   void initState() {
     super.initState();
@@ -201,20 +196,6 @@ class _WebQrViewState extends State<WebQrView> {
     }
   }
 
-  Future<String?> _captureImage() async {
-    if (_localStream == null) {
-      return null;
-    }
-    final canvas =
-        html.CanvasElement(width: video.videoWidth, height: video.videoHeight);
-    final ctx = canvas.context2D;
-    // canvas.width = video.videoWidth;
-    // canvas.height = video.videoHeight;
-    ctx.drawImage(video, 0, 0);
-    var dataUrl = canvas.toDataUrl('image/jpeg', 0.9);
-    return dataUrl;
-  }
-
   @override
   Widget build(BuildContext context) {
     if (_errorMsg != null) {

lib/src/web/jsqr.dart

@@ -3,7 +3,7 @@ library jsqr;
 
 import 'package:js/js.dart';
 
-@JS("jsQR")
+@JS('jsQR')
 external Code jsQR(var data, int? width, int? height);
 
 @JS()

lib/src/web/media.dart

@@ -1,12 +1,12 @@
 // This is here because dart doesn't seem to support this properly
 // https://stackoverflow.com/questions/61161135/adding-support-for-navigator-mediadevices-getusermedia-to-dart
 
-@JS("navigator.mediaDevices")
+@JS('navigator.mediaDevices')
 library media_devices;
 
 import 'package:js/js.dart';
 
-@JS("getUserMedia")
+@JS('getUserMedia')
 external Future<dynamic> getUserMedia(UserMediaOptions constraints);
 
 @JS()