if chains → switch expressions (#147793)

Previous "if-chains" pull requests:
- https://github.com/flutter/flutter/pull/144905
- https://github.com/flutter/flutter/pull/144977
- https://github.com/flutter/flutter/pull/145194
- https://github.com/flutter/flutter/pull/146293
- https://github.com/flutter/flutter/pull/147472

<br>

I think this one should be enough to wrap things up!

fixes https://github.com/flutter/flutter/issues/144903

---------

Co-authored-by: Victor Sanni <victorsanniay@gmail.com>

dev/benchmarks/macrobenchmarks/lib/src/picture_cache.dart

@@ -209,13 +209,11 @@ class ListItem extends StatelessWidget {
   }
 
   String _convertCountToStr(int count) {
-    if (count < 10000) {
+    return switch (count) {
-      return count.toString();
+      < 10000  => count.toString(),
-    } else if (count < 100000) {
+      < 100000 => '${(count / 10000).toStringAsPrecision(2)}w',
-      return '${(count / 10000).toStringAsPrecision(2)}w';
+      _        => '${(count / 10000).floor()}w',
-    } else {
+    };
-      return '${(count / 10000).floor()}w';
-    }
   }
 
   Widget _buildUserInfo() {

dev/benchmarks/macrobenchmarks/lib/src/web/bench_build_material_checkbox.dart

@@ -31,13 +31,11 @@ class BenchBuildMaterialCheckbox extends WidgetBuildRecorder {
   }
 
   Row _buildRow() {
-    if (_isChecked == null) {
+    _isChecked = switch (_isChecked) {
-      _isChecked = true;
+      null  => true,
-    } else if (_isChecked!) {
+      true  => false,
-      _isChecked = false;
+      false => null,
-    } else {
+    };
-      _isChecked = null;
-    }
 
     return Row(
       children: List<Widget>.generate(10, (int i) {

dev/conductor/core/lib/src/start.dart

@@ -255,16 +255,14 @@ class StartContext extends Context {
     if (atBranchPoint) {
       return ReleaseType.BETA_INITIAL;
     }
-
+    if (releaseChannel != 'stable') {
-    if (releaseChannel == 'stable') {
+      return ReleaseType.BETA_HOTFIX;
-      if (lastVersion.type == VersionType.stable) {
-        return ReleaseType.STABLE_HOTFIX;
-      } else {
-        return ReleaseType.STABLE_INITIAL;
-      }
     }
 
-    return ReleaseType.BETA_HOTFIX;
+    return switch (lastVersion.type) {
+      VersionType.stable => ReleaseType.STABLE_HOTFIX,
+      VersionType.development || VersionType.gitDescribe || VersionType.latest => ReleaseType.STABLE_INITIAL,
+    };
   }
 
   Future<void> run() async {

dev/integration_tests/flutter_gallery/lib/demo/material/backdrop_demo.dart

@@ -307,13 +307,11 @@ class _BackdropDemoState extends State<BackdropDemo> with SingleTickerProviderSt
     }
 
     final double flingVelocity = details.velocity.pixelsPerSecond.dy / _backdropHeight;
-    if (flingVelocity < 0.0) {
+    _controller.fling(velocity: switch (flingVelocity) {
-      _controller.fling(velocity: math.max(2.0, -flingVelocity));
+      < 0.0 => math.max(2.0, -flingVelocity),
-    } else if (flingVelocity > 0.0) {
+      > 0.0 => math.min(-2.0, -flingVelocity),
-      _controller.fling(velocity: math.min(-2.0, -flingVelocity));
+      _ => _controller.value < 0.5 ? -2.0 : 2.0,
-    } else {
+    });
-      _controller.fling(velocity: _controller.value < 0.5 ? -2.0 : 2.0);
-    }
   }
 
   // Stacks a BackdropPanel, which displays the selected category, on top

dev/integration_tests/flutter_gallery/lib/demo/material/list_demo.dart

@@ -184,21 +184,18 @@ class _ListDemoState extends State<ListDemo> {
   }
 
   Widget buildListTile(BuildContext context, String item) {
-    Widget? secondary;
+    final String? subtitle = switch (_itemType) {
-    if (_itemType == _MaterialListType.twoLine) {
+      _MaterialListType.oneLine || _MaterialListType.oneLineWithAvatar || null => null,
-      secondary = const Text('Additional item information.');
+      _MaterialListType.twoLine   => 'Additional item information.',
-    } else if (_itemType == _MaterialListType.threeLine) {
+      _MaterialListType.threeLine => 'Even more additional list item information appears on line three.',
-      secondary = const Text(
+    };
-        'Even more additional list item information appears on line three.',
-      );
-    }
     return MergeSemantics(
       child: ListTile(
         isThreeLine: _itemType == _MaterialListType.threeLine,
         dense: _dense,
         leading: _showAvatars != null ? ExcludeSemantics(child: CircleAvatar(child: Text(item))) : null,
         title: Text('This item represents $item.'),
-        subtitle: secondary,
+        subtitle: subtitle != null ? Text(subtitle) : null,
         trailing: _showIcons != null ? Icon(Icons.info, color: Theme.of(context).disabledColor) : null,
       ),
     );

dev/integration_tests/flutter_gallery/lib/gallery/backdrop.dart

@@ -246,13 +246,11 @@ class _BackdropState extends State<Backdrop> with SingleTickerProviderStateMixin
     }
 
     final double flingVelocity = details.velocity.pixelsPerSecond.dy / _backdropHeight;
-    if (flingVelocity < 0.0) {
+    _controller!.fling(velocity: switch (flingVelocity) {
-      _controller!.fling(velocity: math.max(2.0, -flingVelocity));
+      < 0.0 => math.max(2.0, -flingVelocity),
-    } else if (flingVelocity > 0.0) {
+      > 0.0 => math.min(-2.0, -flingVelocity),
-      _controller!.fling(velocity: math.min(-2.0, -flingVelocity));
+      _ => _controller!.value < 0.5 ? -2.0 : 2.0,
-    } else {
+    });
-      _controller!.fling(velocity: _controller!.value < 0.5 ? -2.0 : 2.0);
-    }
   }
 
   void _toggleFrontLayer() {

dev/integration_tests/flutter_gallery/lib/gallery/syntax_highlighter.dart

@@ -337,22 +337,14 @@ class _HighlightSpan {
   }
 
   TextStyle? textStyle(SyntaxHighlighterStyle? style) {
-    if (type == _HighlightType.number) {
+    return switch (type) {
-      return style!.numberStyle;
+      _HighlightType.number      => style!.numberStyle,
-    } else if (type == _HighlightType.comment) {
+      _HighlightType.comment     => style!.commentStyle,
-      return style!.commentStyle;
+      _HighlightType.keyword     => style!.keywordStyle,
-    } else if (type == _HighlightType.keyword) {
+      _HighlightType.string      => style!.stringStyle,
-      return style!.keywordStyle;
+      _HighlightType.punctuation => style!.punctuationStyle,
-    } else if (type == _HighlightType.string) {
+      _HighlightType.klass       => style!.classStyle,
-      return style!.stringStyle;
+      _HighlightType.constant    => style!.constantStyle,
-    } else if (type == _HighlightType.punctuation) {
+    };
-      return style!.punctuationStyle;
-    } else if (type == _HighlightType.klass) {
-      return style!.classStyle;
-    } else if (type == _HighlightType.constant) {
-      return style!.constantStyle;
-    } else {
-      return style!.baseStyle;
-    }
   }
 }

dev/integration_tests/new_gallery/lib/demos/material/cards_demo.dart

@@ -416,20 +416,15 @@ class _CardsDemoState extends State<CardsDemo> with RestorationMixin {
             for (final TravelDestination destination in destinations(context))
               Container(
                 margin: const EdgeInsets.only(bottom: 8),
-                child: (destination.cardType == CardType.standard)
+                child: switch (destination.cardType) {
-                    ? TravelDestinationItem(destination: destination)
+                  CardType.standard => TravelDestinationItem(destination: destination),
-                    : destination.cardType == CardType.tappable
+                  CardType.tappable => TappableTravelDestinationItem(destination: destination),
-                        ? TappableTravelDestinationItem(
+                  CardType.selectable => SelectableTravelDestinationItem(
-                            destination: destination)
+                    destination: destination,
-                        : SelectableTravelDestinationItem(
+                    isSelected: _isSelected.value,
-                            destination: destination,
+                    onSelected: () => setState(() { _isSelected.value = !_isSelected.value; }),
-                            isSelected: _isSelected.value,
+                  ),
-                            onSelected: () {
+                },
-                              setState(() {
-                                _isSelected.value = !_isSelected.value;
-                              });
-                            },
-                          ),
               ),
           ],
         ),

dev/integration_tests/new_gallery/lib/demos/reference/two_pane_demo.dart

@@ -69,13 +69,10 @@ class TwoPaneDemoState extends State<TwoPaneDemo> with RestorationMixin {
         ),
         endPane: DetailsPane(
           selectedIndex: _currentIndex.value,
-          onClose: widget.type == TwoPaneDemoType.smallScreen
+          onClose: switch (widget.type) {
-              ? () {
+            TwoPaneDemoType.smallScreen => () => setState(() { _currentIndex.value = -1; }),
-                  setState(() {
+            TwoPaneDemoType.foldable || TwoPaneDemoType.tablet => null,
-                    _currentIndex.value = -1;
+          },
-                  });
-                }
-              : null,
         ),
       ),
     );
@@ -190,11 +187,11 @@ class SimulateScreen extends StatelessWidget {
         ),
         padding: const EdgeInsets.all(14),
         child: AspectRatio(
-          aspectRatio: type == TwoPaneDemoType.foldable
+          aspectRatio: switch (type) {
-              ? foldableAspectRatio
+            TwoPaneDemoType.foldable    => foldableAspectRatio,
-              : type == TwoPaneDemoType.tablet
+            TwoPaneDemoType.tablet      => tabletAspectRatio,
-                  ? tabletAspectRatio
+            TwoPaneDemoType.smallScreen => singleScreenAspectRatio,
-                  : singleScreenAspectRatio,
+          },
           child: LayoutBuilder(builder: (BuildContext context, BoxConstraints constraints) {
             final Size size = Size(constraints.maxWidth, constraints.maxHeight);
             final Size hingeSize = Size(size.width * hingeProportion, size.height);

dev/integration_tests/new_gallery/lib/pages/settings_icon/icon.dart

@@ -34,12 +34,12 @@ class _SettingsIconPainter extends CustomPainter {
   ///
   /// The icon is aligned to the bottom-start corner.
   void _computeCenterAndScaling(Size size) {
+    final double dx = switch (Directionality.of(context)) {
+      TextDirection.rtl => size.width - unitWidth * _scaling / 2,
+      TextDirection.ltr => unitWidth * _scaling / 2,
+    };
+    _center = Offset(dx, size.height - unitHeight * _scaling / 2);
     _scaling = min(size.width / unitWidth, size.height / unitHeight);
-    _center = Directionality.of(context) == TextDirection.ltr
-        ? Offset(
-            unitWidth * _scaling / 2, size.height - unitHeight * _scaling / 2)
-        : Offset(size.width - unitWidth * _scaling / 2,
-            size.height - unitHeight * _scaling / 2);
   }
 
   /// Transforms an offset in relative units into an offset in logical pixels.

dev/integration_tests/wide_gamut_test/integration_test/app_test.dart

@@ -103,21 +103,16 @@ bool _findBGR10Color(
   return foundDeepRed;
 }
 
-bool _findColor(List<Object?> result, List<double> color) {
+bool _findColor(List<dynamic> result, List<double> color) {
   expect(result, isNotNull);
   expect(result.length, 4);
-  final int width = (result[0] as int?)!;
+  final [int width, int height, String format, Uint8List bytes] = result;
-  final int height = (result[1] as int?)!;
+  return switch (format) {
-  final String format = (result[2] as String?)!;
+    'MTLPixelFormatBGR10_XR'    => _findBGR10Color(bytes, width, height, color),
-  if (format == 'MTLPixelFormatBGR10_XR') {
+    'MTLPixelFormatBGRA10_XR'   => _findBGRA10Color(bytes, width, height, color),
-    return _findBGR10Color((result[3] as Uint8List?)!, width, height, color);
+    'MTLPixelFormatRGBA16Float' => _findRGBAF16Color(bytes, width, height, color),
-  } else if (format == 'MTLPixelFormatBGRA10_XR') {
+    _ => fail('Unsupported pixel format: $format'),
-    return _findBGRA10Color((result[3] as Uint8List?)!, width, height, color);
+  };
-  } else if (format == 'MTLPixelFormatRGBA16Float') {
-    return _findRGBAF16Color((result[3] as Uint8List?)!, width, height, color);
-  } else {
-    fail('Unsupported pixel format: $format');
-  }
 }
 
 void main() {

dev/manual_tests/lib/density.dart

@@ -163,14 +163,12 @@ class _OptionsState extends State<Options> {
   double sliderValue = 0.0;
 
   String _densityToProfile(VisualDensity density) {
-    if (density == VisualDensity.standard) {
+    return switch (density) {
-      return 'standard';
+      VisualDensity.standard    => 'standard',
-    } else if (density == VisualDensity.compact) {
+      VisualDensity.compact     => 'compact',
-      return 'compact';
+      VisualDensity.comfortable => 'comfortable',
-    } else if (density == VisualDensity.comfortable) {
+      _ => 'custom',
-      return 'comfortable';
+    };
-    }
-    return 'custom';
   }
 
   VisualDensity _profileToDensity(String? profile) {

dev/manual_tests/lib/page_view.dart

@@ -70,9 +70,7 @@ class PageViewAppState extends State<PageViewApp> {
 
   void switchScrollDirection() {
     setState(() {
-      scrollDirection = (scrollDirection == Axis.vertical)
+      scrollDirection = flipAxis(scrollDirection);
-        ? Axis.horizontal
-        : Axis.vertical;
     });
   }
 
@@ -113,9 +111,7 @@ class PageViewAppState extends State<PageViewApp> {
   AppBar _buildAppBar() {
     return AppBar(
       title: const Text('PageView'),
-      actions: <Widget>[
+      actions: <Widget>[Text(scrollDirection.name)],
-        Text(scrollDirection == Axis.horizontal ? 'horizontal' : 'vertical'),
-      ],
     );
   }
 

dev/tools/gen_defaults/lib/template.dart

@@ -169,16 +169,13 @@ abstract class TokenTemplate {
   }
 
   String? _numToString(Object? value, [int? digits]) {
-    if (value == null) {
+    return switch (value) {
-      return null;
+      null => null,
-    }
+      double.infinity => 'double.infinity',
-    if (value is num) {
+      num() when digits == null => value.toString(),
-      if (value == double.infinity) {
+      num() => value.toStringAsFixed(digits!),
-        return 'double.infinity';
+      _ => getToken(value as String).toString(),
-      }
+    };
-      return digits == null ? value.toString() : value.toStringAsFixed(digits);
-    }
-    return getToken(value as String).toString();
   }
 
   /// Generate an elevation value for the given component token.

dev/tools/gen_keycodes/lib/utils.dart

@@ -205,18 +205,11 @@ Map<String, String> reverseMapOfListOfString(Map<String, List<String>> inMap, vo
 ///
 /// Will modify the input map.
 Map<String, dynamic> removeEmptyValues(Map<String, dynamic> map) {
-  return map..removeWhere((String key, dynamic value) {
+  return map..removeWhere((String key, dynamic value) => switch (value) {
-    if (value == null) {
+    null => true,
-      return true;
+    Map<String, dynamic>() => removeEmptyValues(value).isEmpty,
-    }
+    Iterable<dynamic>() => value.isEmpty,
-    if (value is Map<String, dynamic>) {
+    _ => false,
-      final Map<String, dynamic> regularizedMap = removeEmptyValues(value);
-      return regularizedMap.isEmpty;
-    }
-    if (value is Iterable<dynamic>) {
-      return value.isEmpty;
-    }
-    return false;
   });
 }
 

examples/api/lib/material/snack_bar/snack_bar.2.dart

@@ -123,13 +123,10 @@ class _SnackBarExampleState extends State<SnackBarExample> {
               const Text('Multi Line Text'),
               Switch(
                 value: _multiLine,
-                onChanged: _snackBarBehavior == SnackBarBehavior.fixed
+                onChanged: switch (_snackBarBehavior) {
-                    ? null
+                  SnackBarBehavior.fixed || null => null,
-                    : (bool value) {
+                  SnackBarBehavior.floating => (bool value) => setState(() { _multiLine = !_multiLine; }),
-                        setState(() {
+                },
-                          _multiLine = !_multiLine;
-                        });
-                      },
               ),
             ],
           ),
@@ -139,13 +136,10 @@ class _SnackBarExampleState extends State<SnackBarExample> {
               value: _sliderValue,
               divisions: 20,
               label: _sliderValue.toStringAsFixed(2),
-              onChanged: _snackBarBehavior == SnackBarBehavior.fixed
+              onChanged: switch (_snackBarBehavior) {
-                  ? null
+                SnackBarBehavior.fixed || null => null,
-                  : (double value) {
+                SnackBarBehavior.floating => (double value) => setState(() { _sliderValue = value; }),
-                      setState(() {
+              },
-                        _sliderValue = value;
-                      });
-                    },
             ),
           ]),
           const SizedBox(height: 16.0),

packages/flutter/test/widgets/linked_scroll_view_test.dart

@@ -91,17 +91,14 @@ class LinkedScrollController extends ScrollController {
   @override
   void debugFillDescription(List<String> description) {
     super.debugFillDescription(description);
-    if (before != null && after != null) {
+    final String linkSymbol = switch ((before, after)) {
-      description.add('links: ⬌');
+      (null, null) => 'none',
-    } else if (before != null) {
+      (null, _)    => '➡',
-      description.add('links: ⬅');
+      (_, null)    => '⬅',
-    } else if (after != null) {
+      (_, _)       => '⬌',
-      description.add('links: ➡');
+    };
-    } else {
+    description.add('links: $linkSymbol');
-      description.add('links: none');
-    }
   }
-
 }
 
 class LinkedScrollPosition extends ScrollPositionWithSingleContext {

packages/flutter/test/widgets/overscroll_stretch_indicator_test.dart

@@ -27,11 +27,10 @@ void main() {
     final AxisDirection axisDirection;
     switch (axis) {
       case Axis.horizontal:
-        if (textDirection == TextDirection.rtl) {
+        axisDirection = switch (textDirection) {
-          axisDirection = reverse ? AxisDirection.right : AxisDirection.left;
+          TextDirection.rtl => reverse ? AxisDirection.right : AxisDirection.left,
-        } else {
+          TextDirection.ltr => reverse ? AxisDirection.left : AxisDirection.right,
-          axisDirection = reverse ? AxisDirection.left : AxisDirection.right;
+        };
-        }
       case Axis.vertical:
         axisDirection = reverse ? AxisDirection.up : AxisDirection.down;
     }

packages/flutter/test/widgets/two_dimensional_viewport_test.dart

@@ -2722,13 +2722,11 @@ void main() {
               addAutomaticKeepAlives: false,
               addRepaintBoundaries: false,
               builder: (BuildContext context, ChildVicinity vicinity) {
-                ValueKey<int>? key;
+                final ValueKey<int>? key = switch (vicinity) {
-                if (vicinity == const ChildVicinity(xIndex: 1, yIndex: 1)) {
+                  ChildVicinity(xIndex: 1, yIndex: 1) => const ValueKey<int>(1),
-                  key = const ValueKey<int>(1);
+                  ChildVicinity(xIndex: 1, yIndex: 2) => const ValueKey<int>(2),
-                } else if (vicinity ==
+                  _ => null,
-                    const ChildVicinity(xIndex: 1, yIndex: 2)) {
+                };
-                  key = const ValueKey<int>(2);
-                }
                 return SizedBox.square(key: key, dimension: 200);
               });
       final TwoDimensionalChildBuilderDelegate delegate2 =
@@ -2770,13 +2768,11 @@ void main() {
               addAutomaticKeepAlives: false,
               addRepaintBoundaries: false,
               builder: (BuildContext context, ChildVicinity vicinity) {
-                ValueKey<int>? key;
+                final ValueKey<int>? key = switch (vicinity) {
-                if (vicinity == const ChildVicinity(xIndex: 1, yIndex: 1)) {
+                  ChildVicinity(xIndex: 0, yIndex: 0) => const ValueKey<int>(1),
-                  key = const ValueKey<int>(1);
+                  ChildVicinity(xIndex: 1, yIndex: 1) => const ValueKey<int>(2),
-                } else if (vicinity ==
+                  _ => null,
-                    const ChildVicinity(xIndex: 1, yIndex: 2)) {
+                };
-                  key = const ValueKey<int>(2);
-                }
                 return Checkbox(key: key, value: false, onChanged: (_) {});
               });
       final TwoDimensionalChildBuilderDelegate delegate2 =

packages/flutter_driver/lib/src/driver/timeline.dart

@@ -118,19 +118,12 @@ List<TimelineEvent>? _parseEvents(Map<String, dynamic> json) {
           .toList();
 
   timelineEvents.sort((TimelineEvent e1, TimelineEvent e2) {
-    final int? ts1 = e1.timestampMicros;
+    return switch ((e1.timestampMicros, e2.timestampMicros)) {
-    final int? ts2 = e2.timestampMicros;
+      (null, null) =>  0,
-    if (ts1 == null) {
+      (_, null)    =>  1,
-      if (ts2 == null) {
+      (null, _)    => -1,
-        return 0;
+      (final int ts1, final int ts2) => ts1.compareTo(ts2),
-      } else {
+    };
-        return -1;
-      }
-    } else if (ts2 == null) {
-      return 1;
-    } else {
-      return ts1.compareTo(ts2);
-    }
   });
 
   return timelineEvents;

packages/flutter_test/lib/src/matchers.dart

@@ -546,12 +546,11 @@ Matcher coversSameAreaAs(Path expectedPath, { required Rect areaToCompare, int s
 ///  * [flutter_test] for a discussion of test configurations, whereby callers
 ///    may swap out the backend for this matcher.
 AsyncMatcher matchesGoldenFile(Object key, {int? version}) {
-  if (key is Uri) {
+  return switch (key) {
-    return MatchesGoldenFile(key, version);
+    Uri()    => MatchesGoldenFile(key, version),
-  } else if (key is String) {
+    String() => MatchesGoldenFile.forStringPath(key, version),
-    return MatchesGoldenFile.forStringPath(key, version);
+    _ => throw ArgumentError('Unexpected type for golden file: ${key.runtimeType}'),
-  }
+  };
-  throw ArgumentError('Unexpected type for golden file: ${key.runtimeType}');
 }
 
 /// Asserts that a [Finder], [Future<ui.Image>], or [ui.Image] matches a

packages/flutter_test/lib/src/widget_tester.dart

@@ -932,14 +932,11 @@ class WidgetTester extends WidgetController implements HitTestDispatcher, Ticker
 
         final Key? key = widget.key;
         if (key is ValueKey<dynamic>) {
-          String? keyLabel;
+          final String? keyLabel = switch (key.value) {
-          if (key is ValueKey<int> ||
+            int() || double() || bool() => 'const ${key.runtimeType}(${key.value})',
-              key is ValueKey<double> ||
+            final String value => "const Key('$value')",
-              key is ValueKey<bool>) {
+            _ => null,
-            keyLabel = 'const ${key.runtimeType}(${key.value})';
+          };
-          } else if (key is ValueKey<String>) {
-            keyLabel = "const Key('${key.value}')";
-          }
           if (keyLabel != null) {
             final Iterable<Element> matches = find.byKey(key).evaluate();
             if (matches.length == 1) {

packages/flutter_tools/lib/src/android/deferred_components_validator.dart

@@ -131,12 +131,11 @@ abstract class DeferredComponentsValidator {
           if (line.startsWith('Only in android')) {
             continue;
           }
-          TerminalColor color = TerminalColor.grey;
+          final TerminalColor color = switch (line[0]) {
-          if (line.startsWith('+')) {
+            '+' => TerminalColor.green,
-            color = TerminalColor.green;
+            '-' => TerminalColor.red,
-          } else if (line.startsWith('-')) {
+            _   => TerminalColor.grey,
-            color = TerminalColor.red;
+          };
-          }
           logger.printStatus(line, color: color);
         }
         logger.printStatus('');

packages/flutter_tools/lib/src/base/multi_root_file_system.dart

@@ -115,18 +115,15 @@ class MultiRootFileSystem extends ForwardingFileSystem {
   /// If the path is a multiroot uri, resolve to the actual path of the
   /// underlying file system. Otherwise, return as is.
   dynamic _resolve(dynamic path) {
-    Uri uri;
     if (path == null) {
       return null;
-    } else if (path is String) {
-      uri = Uri.parse(path);
-    } else if (path is Uri) {
-      uri = path;
-    } else if (path is FileSystemEntity) {
-      uri = path.uri;
-    } else {
-      throw ArgumentError('Invalid type for "path": ${(path as Object?)?.runtimeType}');
     }
+    final Uri uri = switch (path) {
+      String() => Uri.parse(path),
+      Uri() => path,
+      FileSystemEntity() => path.uri,
+      _ => throw ArgumentError('Invalid type for "path": ${(path as Object?)?.runtimeType}'),
+    };
 
     if (!uri.hasScheme || uri.scheme != _scheme) {
       return path;

packages/flutter_tools/lib/src/commands/build_ios.dart

@@ -666,11 +666,10 @@ abstract class _BuildIOSSubCommand extends BuildSubCommand {
 
     final String logTarget = environmentType == EnvironmentType.simulator ? 'simulator' : 'device';
     final String typeName = globals.artifacts!.getEngineType(TargetPlatform.ios, buildInfo.mode);
-    if (xcodeBuildAction == XcodeBuildAction.build) {
+    globals.printStatus(switch (xcodeBuildAction) {
-      globals.printStatus('Building $app for $logTarget ($typeName)...');
+      XcodeBuildAction.build   => 'Building $app for $logTarget ($typeName)...',
-    } else {
+      XcodeBuildAction.archive => 'Archiving $app...',
-      globals.printStatus('Archiving $app...');
+    });
-    }
     final XcodeBuildResult result = await buildXcodeProject(
       app: app,
       buildInfo: buildInfo,

packages/flutter_tools/lib/src/commands/build_ios_framework.dart

@@ -429,22 +429,17 @@ end
     Directory simulatorBuildOutput,
   ) async {
     const String appFrameworkName = 'App.framework';
-
     final Status status = globals.logger.startProgress(
       ' ├─Building App.xcframework...',
     );
-    final List<EnvironmentType> environmentTypes = <EnvironmentType>[
-      EnvironmentType.physical,
-      EnvironmentType.simulator,
-    ];
     final List<Directory> frameworks = <Directory>[];
 
     try {
-      for (final EnvironmentType sdkType in environmentTypes) {
+      for (final EnvironmentType sdkType in EnvironmentType.values) {
-        final Directory outputBuildDirectory =
+        final Directory outputBuildDirectory = switch (sdkType) {
-            sdkType == EnvironmentType.physical
+          EnvironmentType.physical  => iPhoneBuildOutput,
-                ? iPhoneBuildOutput
+          EnvironmentType.simulator => simulatorBuildOutput,
-                : simulatorBuildOutput;
+        };
         frameworks.add(outputBuildDirectory.childDirectory(appFrameworkName));
         final Environment environment = Environment(
           projectDir: globals.fs.currentDirectory,

packages/flutter_tools/lib/src/commands/daemon.dart

@@ -1429,16 +1429,12 @@ Map<String, Object?> _operationResultToMap(OperationResult result) {
 }
 
 Object? _toJsonable(Object? obj) {
-  if (obj is String || obj is int || obj is bool || obj is Map<Object?, Object?> || obj is List<Object?> || obj == null) {
+  return switch (obj) {
-    return obj;
+    String() || int() || bool() || Map<Object?, Object?>() || List<Object?>() || null => obj,
-  }
+    OperationResult() => _operationResultToMap(obj),
-  if (obj is OperationResult) {
+    ToolExit() => obj.message,
-    return _operationResultToMap(obj);
+    _ => obj.toString(),
-  }
+  };
-  if (obj is ToolExit) {
-    return obj.message;
-  }
-  return '$obj';
 }
 
 class NotifyingLogger extends DelegatingLogger {

packages/flutter_tools/lib/src/device.dart

@@ -942,12 +942,11 @@ enum ImpellerStatus {
 
   const ImpellerStatus._(this.asBool);
 
-  factory ImpellerStatus.fromBool(bool? b) {
+  factory ImpellerStatus.fromBool(bool? b) => switch (b) {
-    if (b == null) {
+    true  => enabled,
-      return platformDefault;
+    false => disabled,
-    }
+    null  => platformDefault,
-    return b ? enabled : disabled;
+  };
-  }
 
   final bool? asBool;
 }

packages/flutter_tools/lib/src/ios/core_devices.dart

@@ -439,15 +439,11 @@ class IOSCoreDevice {
   String? get udid => hardwareProperties?.udid;
 
   DeviceConnectionInterface? get connectionInterface {
-    final String? transportType = connectionProperties?.transportType;
+    return switch (connectionProperties?.transportType?.toLowerCase()) {
-    if (transportType != null) {
+      'localnetwork' => DeviceConnectionInterface.wireless,
-      if (transportType.toLowerCase() == 'localnetwork') {
+      'wired'        => DeviceConnectionInterface.attached,
-        return DeviceConnectionInterface.wireless;
+      _ => null,
-      } else if (transportType.toLowerCase() == 'wired') {
+    };
-        return DeviceConnectionInterface.attached;
-      }
-    }
-    return null;
   }
 
   @visibleForTesting

packages/flutter_tools/lib/src/localizations/message_parser.dart

@@ -96,16 +96,12 @@ class Node {
   // Token constructors.
   Node.openBrace(this.positionInMessage): type = ST.openBrace, value = '{';
   Node.closeBrace(this.positionInMessage): type = ST.closeBrace, value = '}';
-  Node.brace(this.positionInMessage, String this.value) {
+  Node.brace(this.positionInMessage, String this.value)
-    if (value == '{') {
+      : type = switch (value) {
-      type = ST.openBrace;
+          '{' => ST.openBrace,
-    } else if (value == '}') {
+          '}' => ST.closeBrace,
-      type = ST.closeBrace;
+          _ => throw L10nException('Provided value $value is not a brace.')
-    } else {
+        };
-      // We should never arrive here.
-      throw L10nException('Provided value $value is not a brace.');
-    }
-  }
   Node.equalSign(this.positionInMessage): type = ST.equalSign, value = '=';
   Node.comma(this.positionInMessage): type = ST.comma, value = ',';
   Node.string(this.positionInMessage, String this.value): type = ST.string;

packages/flutter_tools/lib/src/resident_runner.dart

@@ -914,12 +914,10 @@ abstract class ResidentHandlers {
     final Brightness? current = await flutterDevices.first!.vmService!.flutterBrightnessOverride(
       isolateId: views.first.uiIsolate!.id!,
     );
-    Brightness next;
+    final Brightness next = switch (current) {
-    if (current == Brightness.light) {
+      Brightness.light => Brightness.dark,
-      next = Brightness.dark;
+      Brightness.dark || null => Brightness.light,
-    } else {
+    };
-      next = Brightness.light;
-    }
     for (final FlutterDevice? device in flutterDevices) {
       final List<FlutterView> views = await device!.vmService!.getFlutterViews();
       for (final FlutterView view in views) {

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -772,15 +772,14 @@ abstract class FlutterCommand extends Command<void> {
     return null;
   }();
 
-  DeviceConnectionInterface? get deviceConnectionInterface  {
+  DeviceConnectionInterface? get deviceConnectionInterface {
     if ((argResults?.options.contains(FlutterOptions.kDeviceConnection) ?? false)
         && (argResults?.wasParsed(FlutterOptions.kDeviceConnection) ?? false)) {
-      final String? connectionType = stringArg(FlutterOptions.kDeviceConnection);
+      return switch (stringArg(FlutterOptions.kDeviceConnection)) {
-      if (connectionType == 'attached') {
+        'attached' => DeviceConnectionInterface.attached,
-        return DeviceConnectionInterface.attached;
+        'wireless' => DeviceConnectionInterface.wireless,
-      } else if (connectionType == 'wireless') {
+        _ => null,
-        return DeviceConnectionInterface.wireless;
+      };
-      }
     }
     return null;
   }

packages/flutter_tools/test/src/context.dart

@@ -290,13 +290,11 @@ class FakeDeviceManager implements DeviceManager {
   Device? getSingleEphemeralDevice(List<Device> devices) => null;
 
   List<Device> filteredDevices(DeviceDiscoveryFilter? filter) {
-    if (filter?.deviceConnectionInterface == DeviceConnectionInterface.attached) {
+    return switch (filter?.deviceConnectionInterface) {
-      return attachedDevices;
+      DeviceConnectionInterface.attached => attachedDevices,
-    }
+      DeviceConnectionInterface.wireless => wirelessDevices,
-    if (filter?.deviceConnectionInterface == DeviceConnectionInterface.wireless) {
+      null => attachedDevices + wirelessDevices,
-      return wirelessDevices;
+    };
-    }
-    return attachedDevices + wirelessDevices;
   }
 }