no-op the zoom & torch on the web

 import 'dart:js_interop';
 import 'dart:js_interop';
 
 
-import 'package:mobile_scanner/src/enums/torch_state.dart';
 import 'package:web/web.dart';
 import 'package:web/web.dart';
 
 
 /// This class represents a delegate that manages the constraints for a [MediaStreamTrack].
 /// This class represents a delegate that manages the constraints for a [MediaStreamTrack].
@@ -27,107 +26,8 @@ final class MediaTrackConstraintsDelegate {
     return MediaTrackSettings(
     return MediaTrackSettings(
       width: settings.width,
       width: settings.width,
       height: settings.height,
       height: settings.height,
-      zoom: settings.zoomNullable ?? 1.0,
-      facingMode: settings.facingModeNullable ?? '',
-      focusMode: settings.focusModeNullable ?? 'none',
-      torch: settings.torchNullable ?? false,
-      focusDistance: settings.focusDistanceNullable ?? 0.0,
+      facingMode: settings.facingMode,
       aspectRatio: settings.aspectRatio,
       aspectRatio: settings.aspectRatio,
     );
     );
   }
   }
-
-  /// Returns a list of supported flashlight modes for the given [mediaStream].
-  ///
-  /// The [TorchState.off] mode is always supported, regardless of the return value.
-  Future<List<TorchState>> getSupportedFlashlightModes(
-    MediaStream? mediaStream,
-  ) async {
-    if (mediaStream == null) {
-      return [];
-    }
-
-    final List<JSAny?> tracks = mediaStream.getVideoTracks().toDart;
-
-    if (tracks.isEmpty) {
-      return [];
-    }
-
-    final MediaStreamTrack? track = tracks.first as MediaStreamTrack?;
-
-    if (track == null) {
-      return [];
-    }
-
-    try {
-      final MediaTrackCapabilities capabilities = track.getCapabilities();
-
-      return [
-        if (capabilities.torch) TorchState.on,
-      ];
-    } catch (_) {
-      // Firefox does not support getCapabilities() yet.
-      // https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack/getCapabilities#browser_compatibility
-
-      return [];
-    }
-  }
-
-  /// Returns whether the given [mediaStream] has a flashlight.
-  Future<bool> hasFlashlight(MediaStream? mediaStream) async {
-    return (await getSupportedFlashlightModes(mediaStream)).isNotEmpty;
-  }
-
-  /// Set the flashlight state of the given [mediaStream] to the given [value].
-  Future<void> setFlashlightState(
-    MediaStream? mediaStream,
-    TorchState value,
-  ) async {
-    if (mediaStream == null) {
-      return;
-    }
-
-    if (await hasFlashlight(mediaStream)) {
-      final List<JSAny?> tracks = mediaStream.getVideoTracks().toDart;
-
-      if (tracks.isEmpty) {
-        return;
-      }
-
-      final bool flashlightEnabled = switch (value) {
-        TorchState.on => true,
-        TorchState.off || TorchState.unavailable => false,
-      };
-
-      final MediaStreamTrack? track = tracks.first as MediaStreamTrack?;
-
-      final MediaTrackConstraints constraints = MediaTrackConstraints(
-        advanced: [
-          {'torch': flashlightEnabled}.jsify(),
-        ].toJS,
-      );
-
-      await track?.applyConstraints(constraints).toDart;
-    }
-  }
-}
-
-// TODO: turn this extension into an extension type when Dart 3.3 releases.
-
-// This extension exists because the Web IDL bindings for MediaTrackSettings
-// do not account for unavailable properties.
-extension _NullableMediaTrackSettings on MediaTrackSettings {
-  @JS('facingMode')
-  external String? get facingModeNullable;
-
-  @JS('focusDistance')
-  external num? get focusDistanceNullable;
-
-  @JS('focusMode')
-  external String? get focusModeNullable;
-
-  @JS('torch')
-  external bool? get torchNullable;
-
-  @JS('zoom')
-  external num? get zoomNullable;
 }
 }

@@ -52,6 +52,11 @@ class MobileScannerWeb extends MobileScannerPlatform {
   Completer<void>? _cameraPermissionCompleter;
   Completer<void>? _cameraPermissionCompleter;
 
 
   /// The stream controller for the media track settings stream.
   /// The stream controller for the media track settings stream.
+  ///
+  /// Currently, only the facing mode setting can be supported,
+  /// because that is the only property for video tracks that can be observed.
+  ///
+  /// See https://developer.mozilla.org/en-US/docs/Web/API/MediaTrackConstraints#instance_properties_of_video_tracks
   final StreamController<MediaTrackSettings> _settingsController =
   final StreamController<MediaTrackSettings> _settingsController =
       StreamController.broadcast();
       StreamController.broadcast();
 
 
@@ -71,14 +76,12 @@ class MobileScannerWeb extends MobileScannerPlatform {
   Stream<BarcodeCapture?> get barcodesStream => _barcodesController.stream;
   Stream<BarcodeCapture?> get barcodesStream => _barcodesController.stream;
 
 
   @override
   @override
-  Stream<TorchState> get torchStateStream => _settingsController.stream.map(
-        (settings) => settings.torch ? TorchState.on : TorchState.off,
-      );
+  Stream<TorchState> get torchStateStream =>
+      _settingsController.stream.map((_) => TorchState.off);
 
 
   @override
   @override
-  Stream<double> get zoomScaleStateStream => _settingsController.stream.map(
-        (settings) => settings.zoom.toDouble(),
-      );
+  Stream<double> get zoomScaleStateStream =>
+      _settingsController.stream.map((_) => 1.0);
 
 
   void _handleMediaTrackSettingsChange(MediaTrackSettings settings) {
   void _handleMediaTrackSettingsChange(MediaTrackSettings settings) {
     if (_settingsController.isClosed) {
     if (_settingsController.isClosed) {