Unify analysis options (#108462)

analysis_options.yaml

@@ -99,7 +99,7 @@ linter:
     # - conditional_uri_does_not_exist # not yet tested
     # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
     - control_flow_in_finally
-    # - curly_braces_in_flow_control_structures # not required by flutter style, but developer-facing code should have this on
+    - curly_braces_in_flow_control_structures
     - depend_on_referenced_packages
     - deprecated_consistency
     # - diagnostic_describe_all_properties # enabled only at the framework level (packages/flutter/lib)

dev/benchmarks/complex_layout/lib/main.dart

@@ -113,10 +113,11 @@ class ComplexLayoutState extends State<ComplexLayout> {
               key: const Key('complex-scroll'), // this key is used by the driver test
               controller: ScrollController(),  // So that the scroll offset can be tracked
               itemBuilder: (BuildContext context, int index) {
-                if (index.isEven)
+                if (index.isEven) {
                   return FancyImageItem(index, key: PageStorageKey<int>(index));
-                else
+                } else {
                   return FancyGalleryItem(index, key: PageStorageKey<int>(index));
+                }
               },
             ),
           ),

dev/benchmarks/complex_layout/test/measure_scroll_smoothness.dart

@@ -239,8 +239,9 @@ Map<String, dynamic> scrollSummary(
     //
     final double absJerk = (scrollOffset[i-1] + scrollOffset[i+1] - 2*scrollOffset[i]).abs();
     absJerkAvg += absJerk;
-    if (absJerk > 0.5)
+    if (absJerk > 0.5) {
       jankyCount += 1;
+    }
   }
   // expect(lostFrame < 0.1 * frameTimestamp.length, true);
   absJerkAvg /= frameTimestamp.length - lostFrame;

dev/benchmarks/complex_layout/test_driver/scroll_perf_test.dart

@@ -18,8 +18,9 @@ void main() {
     });
 
     tearDownAll(() async {
-      if (driver != null)
+      if (driver != null) {
         driver.close();
+      }
     });
 
     Future<void> testScrollPerf(String listKey, String summaryName) async {

dev/benchmarks/complex_layout/test_driver/semantics_perf_test.dart

@@ -19,8 +19,9 @@ void main() {
     });
 
     tearDownAll(() async {
-      if (driver != null)
+      if (driver != null) {
         driver.close();
+      }
     });
 
     test('initial tree creation', () async {
@@ -34,8 +35,9 @@ void main() {
       });
 
       final Iterable<TimelineEvent>? semanticsEvents = timeline.events?.where((TimelineEvent event) => event.name == 'SEMANTICS');
-      if (semanticsEvents?.length != 2)
+      if (semanticsEvents?.length != 2) {
         fail('Expected exactly two "SEMANTICS" events, got ${semanticsEvents?.length}:\n$semanticsEvents');
+      }
       final Duration semanticsTreeCreation = Duration(microseconds: semanticsEvents!.last.timestampMicros! - semanticsEvents.first.timestampMicros!);
 
       final String jsonEncoded = json.encode(<String, dynamic>{'initialSemanticsTreeCreation': semanticsTreeCreation.inMilliseconds});

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

@@ -44,13 +44,16 @@ const int kExitCodeSuccess = 0;
 
 final GetStackPointerCallback getStackPointer = () {
   // Makes sure we are running on an Android arm64 device.
-  if (!io.Platform.isAndroid)
+  if (!io.Platform.isAndroid) {
     throw 'This benchmark test can only be run on Android arm devices.';
+  }
   final io.ProcessResult result = io.Process.runSync('getprop', <String>['ro.product.cpu.abi']);
-  if (result.exitCode != 0)
+  if (result.exitCode != 0) {
     throw 'Failed to retrieve CPU information.';
-  if (!result.stdout.toString().contains('armeabi'))
+  }
+  if (!result.stdout.toString().contains('armeabi')) {
     throw 'This benchmark test can only be run on Android arm devices.';
+  }
 
   // Creates a block of memory to store the assembly code.
   final ffi.Pointer<ffi.Void> region = mmap(ffi.nullptr, kMemorySize, kProtRead | kProtWrite,

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

@@ -159,8 +159,9 @@ class _Tester {
     final Stopwatch stopwatch = Stopwatch()..start();
     await gesture.moveTo(location, timeStamp: currentTime);
     stopwatch.stop();
-    if (onDataPoint != null)
+    if (onDataPoint != null) {
       onDataPoint(stopwatch.elapsed);
+    }
     await _UntilNextFrame.wait();
   }
 

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

@@ -181,8 +181,9 @@ class _Tester {
     final Stopwatch stopwatch = Stopwatch()..start();
     await gesture.moveTo(location, timeStamp: currentTime);
     stopwatch.stop();
-    if (onDataPoint != null)
+    if (onDataPoint != null) {
       onDataPoint(stopwatch.elapsed);
+    }
     await _UntilNextFrame.wait();
   }
 

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

@@ -405,8 +405,9 @@ abstract class WidgetRecorder extends Recorder implements FrameRecorder {
     if (shouldContinue()) {
       PlatformDispatcher.instance.scheduleFrame();
     } else {
-      for (final VoidCallback fn in _didStopCallbacks)
+      for (final VoidCallback fn in _didStopCallbacks) {
         fn();
+      }
       _runCompleter!.complete();
     }
   }
@@ -520,8 +521,9 @@ abstract class WidgetBuildRecorder extends Recorder implements FrameRecorder {
       showWidget = !showWidget;
       _hostState._setStateTrampoline();
     } else {
-      for (final VoidCallback fn in _didStopCallbacks)
+      for (final VoidCallback fn in _didStopCallbacks) {
         fn();
+      }
       _runCompleter!.complete();
     }
   }

dev/benchmarks/microbenchmarks/lib/foundation/change_notifier_bench.dart

@@ -39,13 +39,14 @@ void main() {
       watch.stop();
       final int elapsed = watch.elapsedMicroseconds;
       final double averagePerIteration = elapsed / iteration;
-      if (addResult)
+      if (addResult) {
         printer.addResult(
           description: '$name ($listenerCount listeners)',
           value: averagePerIteration * _kScale,
           unit: 'ns per iteration',
           name: '$name$listenerCount',
         );
+      }
     }
   }
 
@@ -65,13 +66,14 @@ void main() {
       watch.stop();
       final int elapsed = watch.elapsedMicroseconds;
       final double averagePerIteration = elapsed / iteration;
-      if (addResult)
+      if (addResult) {
         printer.addResult(
           description: '$name ($listenerCount listeners)',
           value: averagePerIteration * _kScale,
           unit: 'ns per iteration',
           name: '$name$listenerCount',
         );
+      }
     }
   }
 
@@ -107,13 +109,14 @@ void main() {
       watch.stop();
       final int elapsed = watch.elapsedMicroseconds;
       final double averagePerIteration = elapsed / iteration;
-      if (addResult)
+      if (addResult) {
         printer.addResult(
           description: '$name ($listenerCount listeners)',
           value: averagePerIteration * _kScale,
           unit: 'ns per iteration',
           name: '$name$listenerCount',
         );
+      }
     }
   }
 
@@ -156,13 +159,14 @@ void main() {
       watch.stop();
       final int elapsed = watch.elapsedMicroseconds;
       final double averagePerIteration = elapsed / iteration;
-      if (addResult)
+      if (addResult) {
         printer.addResult(
           description: '$name ($listenerCount listeners)',
           value: averagePerIteration * _kScale,
           unit: 'ns per iteration',
           name: '$name$listenerCount',
         );
+      }
     }
   }
 

dev/benchmarks/microbenchmarks/lib/gestures/velocity_tracker_bench.dart

@@ -32,10 +32,12 @@ void main() {
     watch.start();
     for (int i = 0; i < _kNumIters; i += 1) {
       for (final PointerEvent event in velocityEventData) {
-        if (event is PointerDownEvent || event is PointerMoveEvent)
+        if (event is PointerDownEvent || event is PointerMoveEvent) {
           tracker.addPosition(event.timeStamp, event.position);
-        if (event is PointerUpEvent)
+        }
+        if (event is PointerUpEvent) {
           tracker.getVelocity();
+        }
       }
     }
     watch.stop();

dev/benchmarks/test_apps/stocks/lib/stock_arrow.dart

@@ -67,8 +67,9 @@ class StockArrow extends StatelessWidget {
   }
 
   Color _colorForPercentChange(double percentChange) {
-    if (percentChange > 0)
+    if (percentChange > 0) {
       return Colors.green[_colorIndexForPercentChange(percentChange)]!;
+    }
     return Colors.red[_colorIndexForPercentChange(percentChange)]!;
   }
 

dev/benchmarks/test_apps/stocks/lib/stock_home.dart

@@ -85,8 +85,9 @@ class StockHomeState extends State<StockHome> {
   }
 
   void _handleStockModeChange(StockMode? value) {
-    if (widget.updater != null)
+    if (widget.updater != null) {
       widget.updater(widget.configuration.copyWith(stockMode: value));
+    }
   }
 
   void _handleStockMenu(BuildContext context, _StockMenuItem value) {
@@ -239,8 +240,9 @@ class StockHomeState extends State<StockHome> {
   }
 
   Iterable<Stock> _filterBySearchQuery(Iterable<Stock> stocks) {
-    if (_searchQuery.text.isEmpty)
+    if (_searchQuery.text.isEmpty) {
       return stocks;
+    }
     final RegExp regexp = RegExp(_searchQuery.text, caseSensitive: false);
     return stocks.where((Stock stock) => stock.symbol.contains(regexp));
   }

dev/benchmarks/test_apps/stocks/lib/stock_row.dart

@@ -32,8 +32,9 @@ class StockRow extends StatelessWidget {
   Widget build(BuildContext context) {
     final String lastSale = '\$${stock.lastSale.toStringAsFixed(2)}';
     String changeInPrice = '${stock.percentChange.toStringAsFixed(2)}%';
-    if (stock.percentChange > 0)
+    if (stock.percentChange > 0) {
       changeInPrice = '+$changeInPrice';
+    }
     return InkWell(
       key: ValueKey<String>(stock.symbol),
       onTap: _getHandler(onPressed),

dev/benchmarks/test_apps/stocks/lib/stock_settings.dart

@@ -93,8 +93,9 @@ class StockSettingsState extends State<StockSettings> {
   }
 
   void sendUpdates(StockConfiguration value) {
-    if (widget.updater != null)
+    if (widget.updater != null) {
       widget.updater(value);
+    }
   }
 
   AppBar buildAppBar(BuildContext context) {

dev/benchmarks/test_apps/stocks/lib/stock_symbol_viewer.dart

@@ -21,8 +21,9 @@ class _StockSymbolView extends StatelessWidget {
     assert(stock != null);
     final String lastSale = '\$${stock.lastSale.toStringAsFixed(2)}';
     String changeInPrice = '${stock.percentChange.toStringAsFixed(2)}%';
-    if (stock.percentChange > 0)
+    if (stock.percentChange > 0) {
       changeInPrice = '+$changeInPrice';
+    }
 
     final TextStyle headings = Theme.of(context).textTheme.bodyText1!;
     return Container(

dev/benchmarks/test_apps/stocks/test/icon_color_test.dart

@@ -9,8 +9,9 @@ import 'package:stocks/stock_data.dart' as stock_data;
 
 Element? findElementOfExactWidgetTypeGoingDown(Element node, Type targetType) {
   void walker(Element child) {
-    if (child.widget.runtimeType == targetType)
+    if (child.widget.runtimeType == targetType) {
       throw child;
+    }
     child.visitChildElements(walker);
   }
   try {

dev/bots/analyze_snippet_code.dart

@@ -396,12 +396,14 @@ class _SnippetChecker {
         }
       }
     }
-    if (!silent)
+    if (!silent) {
       print('Found ${sections.length} snippet code blocks');
+    }
     for (final _Section section in sections) {
       final String path = _writeSection(section).path;
-      if (sectionMap != null)
+      if (sectionMap != null) {
         sectionMap[path] = section;
+      }
     }
   }
 
@@ -448,8 +450,9 @@ class _SnippetChecker {
 
   /// Invokes the analyzer on the given [directory] and returns the stdout.
   int _runAnalyzer(Directory directory, {bool silent = true, required List<String> output}) {
-    if (!silent)
+    if (!silent) {
       print('Starting analysis of code snippets.');
+    }
     _createConfigurationFiles(directory);
     final ProcessResult result = Process.runSync(
       _flutter,
@@ -598,8 +601,9 @@ class _SnippetChecker {
       exitCode = 0;
     }
     if (exitCode == 0) {
-      if (!silent)
+      if (!silent) {
         print('No analysis errors in snippets!');
+      }
       assert(analysisErrors.isEmpty);
     }
     return _AnalysisResult(exitCode, analysisErrors);
@@ -633,17 +637,19 @@ class _SnippetChecker {
         // Each section of the dart code that is either split by a blank line, or with '// ...' is
         // treated as a separate code block.
         if (block[index] == '' || block[index] == '// ...') {
-          if (subline == null)
+          if (subline == null) {
             throw _SnippetCheckerException('${_Line(filename: line.filename, line: line.line + index, indent: line.indent)}: '
                 'Unexpected blank line or "// ..." line near start of subblock in snippet code.');
+          }
           subblocks += 1;
           subsections.add(_processBlock(subline, buffer));
           buffer.clear();
           assert(buffer.isEmpty);
           subline = null;
         } else if (block[index].startsWith('// ')) {
-          if (buffer.length > 1) // don't include leading comments
+          if (buffer.length > 1) {
             buffer.add('/${block[index]}'); // so that it doesn't start with "// " and get caught in this again
+          }
         } else {
           subline ??= _Line(
             code: block[index],

dev/bots/flutter_compact_formatter.dart

@@ -133,10 +133,12 @@ class FlutterCompactFormatter {
           originalResult.errorMessage = error;
           originalResult.stackTrace = stackTrace;
         } else {
-          if (error != null)
+          if (error != null) {
             stderr.writeln(error);
-          if (stackTrace != null)
+          }
+          if (stackTrace != null) {
             stderr.writeln(stackTrace);
+          }
         }
         break;
       case 'print':

dev/bots/test.dart

@@ -39,12 +39,15 @@ final String engineVersionFile = path.join(flutterRoot, 'bin', 'internal', 'engi
 final String flutterPluginsVersionFile = path.join(flutterRoot, 'bin', 'internal', 'flutter_plugins.version');
 
 String get platformFolderName {
-  if (Platform.isWindows)
+  if (Platform.isWindows) {
     return 'windows-x64';
-  if (Platform.isMacOS)
+  }
+  if (Platform.isMacOS) {
     return 'darwin-x64';
-  if (Platform.isLinux)
+  }
+  if (Platform.isLinux) {
     return 'linux-x64';
+  }
   throw UnsupportedError('The platform ${Platform.operatingSystem} is not supported by this script.');
 }
 final String flutterTester = path.join(flutterRoot, 'bin', 'cache', 'artifacts', 'engine', platformFolderName, 'flutter_tester$exe');
@@ -187,8 +190,9 @@ Future<void> main(List<String> args) async {
       }
     }
     flutterTestArgs.removeWhere((String arg) => removeArgs.contains(arg));
-    if (Platform.environment.containsKey(CIRRUS_TASK_NAME))
+    if (Platform.environment.containsKey(CIRRUS_TASK_NAME)) {
       print('Running task: ${Platform.environment[CIRRUS_TASK_NAME]}');
+    }
     print('═' * 80);
     await selectShard(<String, ShardRunner>{
       'add_to_app_life_cycle_tests': _runAddToAppLifeCycleTests,
@@ -327,8 +331,9 @@ Future<void> _runTestHarnessTests() async {
 
   // Verify that we correctly generated the version file.
   final String? versionError = await verifyVersion(File(path.join(flutterRoot, 'version')));
-  if (versionError != null)
+  if (versionError != null) {
     exitWithError(<String>[versionError]);
+  }
 }
 
 final String _toolsPath = path.join(flutterRoot, 'packages', 'flutter_tools');
@@ -1748,8 +1753,9 @@ Future<void> _runFlutterTest(String workingDirectory, {
   ];
 
   final bool shouldProcessOutput = useFlutterTestFormatter && !expectFailure && !options.contains('--coverage');
-  if (shouldProcessOutput)
+  if (shouldProcessOutput) {
     args.add('--machine');
+  }
 
   if (script != null) {
     final String fullScriptPath = path.join(workingDirectory, script);
@@ -1757,8 +1763,9 @@ Future<void> _runFlutterTest(String workingDirectory, {
       print('${red}Could not find test$reset: $green$fullScriptPath$reset');
       print('Working directory: $cyan$workingDirectory$reset');
       print('Script: $green$script$reset');
-      if (!printOutput)
+      if (!printOutput) {
         print('This is one of the tests that does not normally print output.');
+      }
       exit(1);
     }
     args.add(script);
@@ -1782,8 +1789,9 @@ Future<void> _runFlutterTest(String workingDirectory, {
 
     if (outputChecker != null) {
       final String? message = outputChecker(result);
-      if (message != null)
+      if (message != null) {
         exitWithError(<String>[message]);
+      }
     }
     return;
   }
@@ -1862,12 +1870,15 @@ Future<String?> verifyVersion(File file) async {
   final RegExp pattern = RegExp(
     r'^(\d+)\.(\d+)\.(\d+)((-\d+\.\d+)?\.pre(\.\d+)?)?$');
   final String version = await file.readAsString();
-  if (!file.existsSync())
+  if (!file.existsSync()) {
     return 'The version logic failed to create the Flutter version file.';
-  if (version == '0.0.0-unknown')
+  }
+  if (version == '0.0.0-unknown') {
     return 'The version logic failed to determine the Flutter version.';
-  if (!version.contains(pattern))
+  }
+  if (!version.contains(pattern)) {
     return 'The version logic generated an invalid version string: "$version".';
+  }
   return null;
 }
 

dev/bots/utils.dart

@@ -59,8 +59,9 @@ String get clock {
 String prettyPrintDuration(Duration duration) {
   String result = '';
   final int minutes = duration.inMinutes;
-  if (minutes > 0)
+  if (minutes > 0) {
     result += '${minutes}min ';
+  }
   final int seconds = duration.inSeconds - minutes * 60;
   final int milliseconds = duration.inMilliseconds - (seconds * 1000 + minutes * 60 * 1000);
   result += '$seconds.${milliseconds.toString().padLeft(3, "0")}s';

dev/conductor/core/analysis_options.yaml

@@ -8,6 +8,5 @@ analyzer:
 linter:
   rules:
     avoid_catches_without_on_clauses: true
-    curly_braces_in_flow_control_structures: true
     prefer_relative_imports: true
     unawaited_futures: true

dev/customer_testing/lib/customer_test.dart

@@ -31,42 +31,54 @@ class CustomerTest {
         test.add(line.substring(5));
       } else if (line.startsWith('test.windows=')) {
         hasTests = true;
-        if (Platform.isWindows)
+        if (Platform.isWindows) {
           test.add(line.substring(13));
+        }
       } else if (line.startsWith('test.macos=')) {
         hasTests = true;
-        if (Platform.isMacOS)
+        if (Platform.isMacOS) {
           test.add(line.substring(11));
+        }
       } else if (line.startsWith('test.linux=')) {
         hasTests = true;
-        if (Platform.isLinux)
+        if (Platform.isLinux) {
           test.add(line.substring(11));
+        }
       } else if (line.startsWith('test.posix=')) {
         hasTests = true;
-        if (Platform.isLinux || Platform.isMacOS)
+        if (Platform.isLinux || Platform.isMacOS) {
           test.add(line.substring(11));
+        }
       } else {
         throw FormatException('${errorPrefix}Unexpected directive:\n$line');
       }
     }
-    if (contacts.isEmpty)
+    if (contacts.isEmpty) {
       throw FormatException('${errorPrefix}No contacts specified. At least one contact e-mail address must be specified.');
+    }
     for (final String email in contacts) {
-      if (!email.contains(_email) || email.endsWith('@example.com'))
+      if (!email.contains(_email) || email.endsWith('@example.com')) {
         throw FormatException('${errorPrefix}The following e-mail address appears to be an invalid e-mail address: $email');
+      }
     }
-    if (fetch.isEmpty)
+    if (fetch.isEmpty) {
       throw FormatException('${errorPrefix}No "fetch" directives specified. Two lines are expected: "git clone https://github.com/USERNAME/REPOSITORY.git tests" and "git -C tests checkout HASH".');
-    if (fetch.length < 2)
+    }
+    if (fetch.length < 2) {
       throw FormatException('${errorPrefix}Only one "fetch" directive specified. Two lines are expected: "git clone https://github.com/USERNAME/REPOSITORY.git tests" and "git -C tests checkout HASH".');
-    if (!fetch[0].contains(_fetch1))
+    }
+    if (!fetch[0].contains(_fetch1)) {
       throw FormatException('${errorPrefix}First "fetch" directive does not match expected pattern (expected "git clone https://github.com/USERNAME/REPOSITORY.git tests").');
-    if (!fetch[1].contains(_fetch2))
+    }
+    if (!fetch[1].contains(_fetch2)) {
       throw FormatException('${errorPrefix}Second "fetch" directive does not match expected pattern (expected "git -C tests checkout HASH").');
-    if (update.isEmpty)
+    }
+    if (update.isEmpty) {
       throw FormatException('${errorPrefix}No "update" directives specified. At least one directory must be specified. (It can be "." to just upgrade the root of the repository.)');
-    if (!hasTests)
+    }
+    if (!hasTests) {
       throw FormatException('${errorPrefix}No "test" directives specified. At least one command must be specified to run tests.');
+    }
     return CustomerTest._(
       List<String>.unmodifiable(contacts),
       List<String>.unmodifiable(fetch),

dev/customer_testing/lib/runner.dart

@@ -17,8 +17,9 @@ Future<bool> runTests({
   int shardIndex = 0,
   required List<File> files,
 }) async {
-  if (verbose)
+  if (verbose) {
     print('Starting run_tests.dart...');
+  }
 
   // Best attempt at evenly splitting tests among the shards
   final List<File> shardedFiles = <File>[];
@@ -46,18 +47,21 @@ Future<bool> runTests({
     } else {
       print('Tests:');
     }
-    for (final File file in shardedFiles)
+    for (final File file in shardedFiles) {
       print(file.path);
+    }
   }
   print('');
 
   for (final File file in shardedFiles) {
-    if (verbose)
+    if (verbose) {
       print('Processing ${file.path}...');
+    }
 
     void printHeader() {
-      if (!verbose)
+      if (!verbose) {
         print('Processing ${file.path}...');
+      }
     }
 
     void failure(String message) {
@@ -82,8 +86,9 @@ Future<bool> runTests({
     bool success = true;
 
     final Directory checkout = Directory.systemTemp.createTempSync('flutter_customer_testing.${path.basenameWithoutExtension(file.path)}.');
-    if (verbose)
+    if (verbose) {
       print('Created temporary directory: ${checkout.path}');
+    }
     try {
       assert(instructions.fetch.isNotEmpty);
       for (final String fetchCommand in instructions.fetch) {
@@ -105,8 +110,9 @@ Future<bool> runTests({
         final Directory customerRepo = Directory(path.join(checkout.path, 'tests'));
         for (final Directory updateDirectory in instructions.update) {
           final Directory resolvedUpdateDirectory = Directory(path.join(customerRepo.path, updateDirectory.path));
-          if (verbose)
+          if (verbose) {
             print('Updating code in ${resolvedUpdateDirectory.path}...');
+          }
           if (!File(path.join(resolvedUpdateDirectory.path, 'pubspec.yaml')).existsSync()) {
             failure('The directory ${updateDirectory.path}, which was specified as an update directory, does not contain a "pubspec.yaml" file.');
             success = false;
@@ -124,11 +130,13 @@ Future<bool> runTests({
           }
         }
         if (success) {
-          if (verbose)
+          if (verbose) {
             print('Running tests...');
+          }
           for (int iteration = 0; iteration < repeat; iteration += 1) {
-            if (verbose && repeat > 1)
+            if (verbose && repeat > 1) {
               print('Round ${iteration + 1} of $repeat.');
+            }
             for (final String testCommand in instructions.tests) {
               testCount += 1;
               success = await shell(testCommand, customerRepo, verbose: verbose, failedCallback: printHeader);
@@ -138,13 +146,15 @@ Future<bool> runTests({
               }
             }
           }
-          if (verbose && success)
+          if (verbose && success) {
             print('Tests finished.');
+          }
         }
       }
     } finally {
-      if (verbose)
+      if (verbose) {
         print('Deleting temporary directory...');
+      }
       try {
         checkout.deleteSync(recursive: true);
       } on FileSystemException {
@@ -155,8 +165,9 @@ Future<bool> runTests({
       final String s = instructions.contacts.length == 1 ? '' : 's';
       print('Contact$s: ${instructions.contacts.join(", ")}');
     }
-    if (verbose || !success)
+    if (verbose || !success) {
       print('');
+    }
   }
   if (failures > 0) {
     final String s = failures == 1 ? '' : 's';
@@ -170,8 +181,9 @@ Future<bool> runTests({
 final RegExp _spaces = RegExp(r' +');
 
 Future<bool> shell(String command, Directory directory, { bool verbose = false, bool silentFailure = false, void Function()? failedCallback }) async {
-  if (verbose)
+  if (verbose) {
     print('>> $command');
+  }
   Process process;
   if (Platform.isWindows) {
     process = await Process.start('CMD.EXE', <String>['/S', '/C', command], workingDirectory: directory.path);
@@ -183,11 +195,13 @@ Future<bool> shell(String command, Directory directory, { bool verbose = false,
   utf8.decoder.bind(process.stdout).transform(const LineSplitter()).listen(verbose ? printLog : output.add);
   utf8.decoder.bind(process.stderr).transform(const LineSplitter()).listen(verbose ? printLog : output.add);
   final bool success = await process.exitCode == 0;
-  if (success || silentFailure)
+  if (success || silentFailure) {
     return success;
+  }
   if (!verbose) {
-    if (failedCallback != null)
+    if (failedCallback != null) {
       failedCallback();
+    }
     print('>> $command');
     output.forEach(printLog);
   }

dev/customer_testing/run_tests.dart

@@ -92,8 +92,9 @@ Future<bool> run(List<String> arguments) async {
   if (help || repeat == null || files.isEmpty || numberShards == null || numberShards <= 0 || shardIndex == null || shardIndex < 0) {
     printHelp();
     if (verbose) {
-      if (repeat == null)
+      if (repeat == null) {
         print('Error: Could not parse repeat count ("${parsedArguments['repeat']}")');
+      }
       if (numberShards == null) {
         print('Error: Could not parse shards count ("${parsedArguments['shards']}")');
       } else if (numberShards < 1) {
@@ -121,8 +122,9 @@ Future<bool> run(List<String> arguments) async {
     return false;
   }
 
-  if (files.length < numberShards)
+  if (files.length < numberShards) {
     print('Warning: There are more shards than tests. Some shards will not run any tests.');
+  }
 
   return runTests(
     repeat: repeat,

dev/devicelab/bin/tasks/android_engine_dependency_proxy_test.dart

@@ -19,8 +19,9 @@ Future<void> main() async {
     section('Find Java');
 
     final String? javaHome = await findJavaHome();
-    if (javaHome == null)
+    if (javaHome == null) {
       return TaskResult.failure('Could not find Java');
+    }
     print('\nUsing JAVA_HOME=$javaHome');
 
     section('Create project');

dev/devicelab/bin/tasks/build_aar_module_test.dart

@@ -19,8 +19,9 @@ Future<void> main() async {
     section('Find Java');
 
     final String? javaHome = await findJavaHome();
-    if (javaHome == null)
+    if (javaHome == null) {
       return TaskResult.failure('Could not find Java');
+    }
     print('\nUsing JAVA_HOME=$javaHome');
 
     final Directory tempDir = Directory.systemTemp.createTempSync('flutter_module_test.');

dev/devicelab/bin/tasks/flutter_gallery__back_button_memory.dart

@@ -42,8 +42,9 @@ class BackButtonMemoryTest extends MemoryTest {
       prepareForNextMessage('READY');
       final String output = await device!.shellEval('am', <String>['start', '-n', '$packageName/$activityName']);
       print('adb shell am start: $output');
-      if (output.contains('Error'))
+      if (output.contains('Error')) {
         fail('unable to launch activity');
+      }
       await receivedNextMessage;
 
       // Wait for the Flutter app to settle (e.g. run GCs).

dev/devicelab/bin/tasks/flutter_test_performance.dart

@@ -90,12 +90,15 @@ Future<int> runTest({bool coverage = false, bool noPub = false}) async {
   });
   final int result = await analysis.exitCode;
   clock.stop();
-  if (result != 0)
+  if (result != 0) {
     throw Exception('flutter test failed with exit code $result');
-  if (badLines > 0)
+  }
+  if (badLines > 0) {
     throw Exception('flutter test rendered unexpected output ($badLines bad lines)');
-  if (step != TestStep.testPassed)
+  }
+  if (step != TestStep.testPassed) {
     throw Exception('flutter test did not finish (only reached step $step)');
+  }
   print('elapsed time: ${clock.elapsedMilliseconds}ms');
   return clock.elapsedMilliseconds;
 }

dev/devicelab/bin/tasks/gradle_plugin_light_apk_test.dart

@@ -258,19 +258,22 @@ Future<void> main() async {
           ]);
         });
 
-        if (result.exitCode == 0)
+        if (result.exitCode == 0) {
           throw failure(
               'Gradle did not exit with error as expected', result);
+        }
         String output = '${result.stdout}\n${result.stderr}';
         if (output.contains('GradleException') ||
             output.contains('Failed to notify') ||
-            output.contains('at org.gradle'))
+            output.contains('at org.gradle')) {
           throw failure(
               'Gradle output should not contain stacktrace', result);
-        if (!output.contains('Build failed'))
+        }
+        if (!output.contains('Build failed')) {
           throw failure(
               'Gradle output should contain a readable error message',
               result);
+        }
 
         section('flutter build apk on build script with error');
         await project.introduceError();
@@ -280,18 +283,21 @@ Future<void> main() async {
             '--release',
           ]);
         });
-        if (result.exitCode == 0)
+        if (result.exitCode == 0) {
           throw failure(
               'flutter build apk should fail when Gradle does', result);
+        }
         output = '${result.stdout}\n${result.stderr}';
-        if (!output.contains('Build failed'))
+        if (!output.contains('Build failed')) {
           throw failure(
               'flutter build apk output should contain a readable Gradle error message',
               result);
-        if (hasMultipleOccurrences(output, 'Build failed'))
+        }
+        if (hasMultipleOccurrences(output, 'Build failed')) {
           throw failure(
               'flutter build apk should not invoke Gradle repeatedly on error',
               result);
+        }
       });
 
       await runProjectTest((FlutterProject project) async {
@@ -303,12 +309,14 @@ Future<void> main() async {
             '--release',
           ]);
         });
-        if (result.exitCode == 0)
+        if (result.exitCode == 0) {
           throw failure(
               'Gradle did not exit with error as expected', result);
+        }
         final String output = '${result.stdout}\n${result.stderr}';
-        if (!output.contains('No file or variants found for asset: lib/gallery/example_code.dart.'))
+        if (!output.contains('No file or variants found for asset: lib/gallery/example_code.dart.')) {
           throw failure(output, result);
+        }
       });
 
       return TaskResult.success(null);

dev/devicelab/bin/tasks/module_custom_host_app_name_test.dart

@@ -23,8 +23,9 @@ Future<void> main() async {
     section('Find Java');
 
     final String? javaHome = await findJavaHome();
-    if (javaHome == null)
+    if (javaHome == null) {
       return TaskResult.failure('Could not find Java');
+    }
     print('\nUsing JAVA_HOME=$javaHome');
 
     section('Create Flutter module project');

dev/devicelab/bin/tasks/module_test.dart

@@ -26,8 +26,9 @@ Future<void> main() async {
     section('Find Java');
 
     final String? javaHome = await findJavaHome();
-    if (javaHome == null)
+    if (javaHome == null) {
       return TaskResult.failure('Could not find Java');
+    }
     print('\nUsing JAVA_HOME=$javaHome');
 
     section('Create Flutter module project');

dev/devicelab/bin/tasks/routing_test.dart

@@ -66,8 +66,9 @@ void main() {
         });
       unawaited(run.exitCode.then<void>((int exitCode) { ok = false; }));
       await Future.any<dynamic>(<Future<dynamic>>[ ready.future, run.exitCode ]);
-      if (!ok)
+      if (!ok) {
         throw 'Failed to run test app.';
+      }
       print('drive: starting...');
       final Process drive = await startProcess(
         path.join(flutterDirectory.path, 'bin', 'flutter'),
@@ -90,11 +91,13 @@ void main() {
       await flutter('install', options: <String>[
         '--uninstall-only',
       ]);
-      if (result != 0)
+      if (result != 0) {
         throw 'Failed to drive test app (exit code $result).';
+      }
       result = await run.exitCode;
-      if (result != 0)
+      if (result != 0) {
         throw 'Received unexpected exit code $result from run process.';
+      }
     });
     return TaskResult.success(null);
   });

dev/devicelab/bin/tasks/service_extensions_test.dart

@@ -52,8 +52,9 @@ void main() {
       });
       unawaited(run.exitCode.then<void>((int exitCode) { ok = false; }));
       await Future.any<dynamic>(<Future<dynamic>>[ ready.future, run.exitCode ]);
-      if (!ok)
+      if (!ok) {
         throw 'Failed to run test app.';
+      }
 
       final VmService client = await vmServiceConnectUri('ws://localhost:$vmServicePort/ws');
       final VM vm = await client.getVM();
@@ -114,14 +115,16 @@ void main() {
 
       run.stdin.write('q');
       final int result = await run.exitCode;
-      if (result != 0)
+      if (result != 0) {
         throw 'Received unexpected exit code $result from run process.';
+      }
     });
     return TaskResult.success(null);
   });
 }
 
 void expect(bool value) {
-  if (!value)
+  if (!value) {
     throw 'failed assertion in service extensions test';
+  }
 }

dev/devicelab/bin/tasks/smoke_test_device.dart

@@ -11,7 +11,7 @@ Future<void> main() async {
   deviceOperatingSystem = DeviceOperatingSystem.fake;
   await task(() async {
     final Device device = await devices.workingDevice;
-    if (device.deviceId == 'FAKE_SUCCESS')
+    if (device.deviceId == 'FAKE_SUCCESS') {
       return TaskResult.success(<String, dynamic>{
         'metric1': 42,
         'metric2': 123,
@@ -20,7 +20,8 @@ Future<void> main() async {
         'metric1',
         'metric2',
       ]);
-    else
+    } else {
       return TaskResult.failure('Failed');
+    }
   });
 }

dev/devicelab/bin/tasks/technical_debt__cost.dart

@@ -36,35 +36,46 @@ final RegExp dartVersionPattern = RegExp(r'// *@dart *= *(\d+).(\d+)');
 final Version firstNullSafeDartVersion = Version(2, 12, 0);
 
 Future<double> findCostsForFile(File file) async {
-  if (path.extension(file.path) == '.py')
+  if (path.extension(file.path) == '.py') {
     return pythonCost;
+  }
   if (path.extension(file.path) != '.dart' &&
       path.extension(file.path) != '.yaml' &&
-      path.extension(file.path) != '.sh')
+      path.extension(file.path) != '.sh') {
     return 0.0;
+  }
   final bool isTest = file.path.endsWith('_test.dart');
   final bool isDart = file.path.endsWith('.dart');
   double total = 0.0;
   for (final String line in await file.readAsLines()) {
-    if (line.contains(todoPattern))
+    if (line.contains(todoPattern)) {
       total += todoCost;
-    if (line.contains(ignorePattern))
+    }
+    if (line.contains(ignorePattern)) {
       total += ignoreCost;
-    if (line.contains(ignoreForFilePattern))
+    }
+    if (line.contains(ignoreForFilePattern)) {
       total += ignoreForFileCost;
-    if (!isTest && line.contains(asDynamicPattern))
+    }
+    if (!isTest && line.contains(asDynamicPattern)) {
       total += asDynamicCost;
-    if (line.contains(deprecationPattern))
+    }
+    if (line.contains(deprecationPattern)) {
       total += deprecationCost;
-    if (line.contains(legacyDeprecationPattern))
+    }
+    if (line.contains(legacyDeprecationPattern)) {
       total += legacyDeprecationCost;
-    if (isTest && line.contains('skip:') && !line.contains('[intended]'))
+    }
+    if (isTest && line.contains('skip:') && !line.contains('[intended]')) {
       total += skipCost;
-    if (isDart && isOptingOutOfNullSafety(line))
+    }
+    if (isDart && isOptingOutOfNullSafety(line)) {
       total += fileNullSafetyMigrationCost;
+    }
   }
-  if (path.basename(file.path) == 'pubspec.yaml' && !packageIsNullSafe(file))
+  if (path.basename(file.path) == 'pubspec.yaml' && !packageIsNullSafe(file)) {
     total += packageNullSafetyMigrationCost;
+  }
   return total;
 }
 
@@ -89,12 +100,14 @@ bool packageIsNullSafe(File file) {
 }
 
 Future<int> findGlobalsForFile(File file) async {
-  if (path.extension(file.path) != '.dart')
+  if (path.extension(file.path) != '.dart') {
     return 0;
+  }
   int total = 0;
   for (final String line in await file.readAsLines()) {
-    if (line.contains(globalsPattern))
+    if (line.contains(globalsPattern)) {
       total += 1;
+    }
   }
   return total;
 }
@@ -106,11 +119,13 @@ Future<double> findCostsForRepo() async {
     workingDirectory: flutterDirectory.path,
   );
   double total = 0.0;
-  await for (final String entry in git.stdout.transform<String>(utf8.decoder).transform<String>(const LineSplitter()))
+  await for (final String entry in git.stdout.transform<String>(utf8.decoder).transform<String>(const LineSplitter())) {
     total += await findCostsForFile(File(path.join(flutterDirectory.path, entry)));
+  }
   final int gitExitCode = await git.exitCode;
-  if (gitExitCode != 0)
+  if (gitExitCode != 0) {
     throw Exception('git exit with unexpected error code $gitExitCode');
+  }
   return total;
 }
 
@@ -121,11 +136,13 @@ Future<int> findGlobalsForTool() async {
     workingDirectory: flutterDirectory.path,
   );
   int total = 0;
-  await for (final String entry in git.stdout.transform<String>(utf8.decoder).transform<String>(const LineSplitter()))
+  await for (final String entry in git.stdout.transform<String>(utf8.decoder).transform<String>(const LineSplitter())) {
     total += await findGlobalsForFile(File(path.join(flutterDirectory.path, entry)));
+  }
   final int gitExitCode = await git.exitCode;
-  if (gitExitCode != 0)
+  if (gitExitCode != 0) {
     throw Exception('git exit with unexpected error code $gitExitCode');
+  }
   return total;
 }
 
@@ -135,8 +152,9 @@ Future<int> countDependencies() async {
     options: <String>['--transitive-closure'],
   )).split('\n');
   final int count = lines.where((String line) => line.contains('->')).length;
-  if (count < 2) // we'll always have flutter and flutter_test, at least...
+  if (count < 2) {
     throw Exception('"flutter update-packages --transitive-closure" returned bogus output:\n${lines.join("\n")}');
+  }
   return count;
 }
 
@@ -146,8 +164,9 @@ Future<int> countConsumerDependencies() async {
     options: <String>['--transitive-closure', '--consumer-only'],
   )).split('\n');
   final int count = lines.where((String line) => line.contains('->')).length;
-  if (count < 2) // we'll always have flutter and flutter_test, at least...
+  if (count < 2) {
     throw Exception('"flutter update-packages --transitive-closure" returned bogus output:\n${lines.join("\n")}');
+  }
   return count;
 }
 

dev/devicelab/lib/framework/apk_utils.dart

@@ -410,8 +410,9 @@ Future<void> _runGradleTask({
     print('stderr:');
     print(result.stderr);
   }
-  if (result.exitCode != 0)
+  if (result.exitCode != 0) {
     throw 'Gradle exited with error';
+  }
 }
 
 Future<ProcessResult> _resultOfGradleTask({
@@ -422,8 +423,9 @@ Future<ProcessResult> _resultOfGradleTask({
   section('Find Java');
   final String? javaHome = await findJavaHome();
 
-  if (javaHome == null)
+  if (javaHome == null) {
     throw TaskResult.failure('Could not find Java');
+  }
 
   print('\nUsing JAVA_HOME=$javaHome');
 

dev/devicelab/lib/framework/devices.dart

@@ -252,8 +252,9 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
       .map<AndroidDevice>((String id) => AndroidDevice(deviceId: id))
       .toList();
 
-    if (allDevices.isEmpty)
+    if (allDevices.isEmpty) {
       throw const DeviceException('No Android devices detected');
+    }
 
     if (cpu != null) {
       for (final AndroidDevice device in allDevices) {
@@ -268,8 +269,9 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
       _workingDevice = allDevices[math.Random().nextInt(allDevices.length)];
     }
 
-    if (_workingDevice == null)
+    if (_workingDevice == null) {
       throw const DeviceException('Cannot find a suitable Android device');
+    }
 
     print('Device chosen: $_workingDevice');
   }
@@ -300,11 +302,13 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
     final List<String> results = <String>[];
     for (final String line in output) {
       // Skip lines like: * daemon started successfully *
-      if (line.startsWith('* daemon '))
+      if (line.startsWith('* daemon ')) {
         continue;
+      }
 
-      if (line.startsWith('List of devices'))
+      if (line.startsWith('List of devices')) {
         continue;
+      }
 
       if (_kDeviceRegex.hasMatch(line)) {
         final Match match = _kDeviceRegex.firstMatch(line)!;
@@ -551,15 +555,17 @@ class AndroidDevice extends Device {
   /// Wake up the device if it is not awake using [togglePower].
   @override
   Future<void> wakeUp() async {
-    if (!(await isAwake()))
+    if (!(await isAwake())) {
       await togglePower();
+    }
   }
 
   /// Send the device to sleep mode if it is not asleep using [togglePower].
   @override
   Future<void> sendToSleep() async {
-    if (!(await isAsleep()))
+    if (!(await isAsleep())) {
       await togglePower();
+    }
   }
 
   /// Sends `KEYCODE_HOME` (3), which causes the device to go to the home screen.
@@ -840,8 +846,9 @@ class IosDeviceDiscovery implements DeviceDiscovery {
       .map<IosDevice>((String id) => IosDevice(deviceId: id))
       .toList();
 
-    if (allDevices.isEmpty)
+    if (allDevices.isEmpty) {
       throw const DeviceException('No iOS devices detected');
+    }
 
     // TODO(yjbanov): filter out and warn about those with low battery level
     _workingDevice = allDevices[math.Random().nextInt(allDevices.length)];
@@ -1211,8 +1218,9 @@ String get adbPath {
 
   final String adbPath = path.join(androidHome, 'platform-tools/adb');
 
-  if (!canRun(adbPath))
+  if (!canRun(adbPath)) {
     throw DeviceException('adb not found at: $adbPath');
+  }
 
   return path.absolute(adbPath);
 }

dev/devicelab/lib/framework/framework.dart

@@ -46,8 +46,9 @@ bool _isTaskRegistered = false;
 /// If no `processManager` is provided, a default [LocalProcessManager] is created
 /// for the task.
 Future<TaskResult> task(TaskFunction task, { ProcessManager? processManager }) async {
-  if (_isTaskRegistered)
+  if (_isTaskRegistered) {
     throw StateError('A task is already registered');
+  }
   _isTaskRegistered = true;
 
   processManager ??= const LocalProcessManager();
@@ -163,8 +164,9 @@ class _TaskRunner {
         }
 
         Future<TaskResult> futureResult = _performTask();
-        if (taskTimeout != null)
+        if (taskTimeout != null) {
           futureResult = futureResult.timeout(taskTimeout);
+        }
 
         result = await futureResult;
       } finally {
@@ -241,8 +243,9 @@ class _TaskRunner {
   /// Causes the Dart VM to stay alive until a request to run the task is
   /// received via the VM service protocol.
   void keepVmAliveUntilTaskRunRequested() {
-    if (_taskStarted)
+    if (_taskStarted) {
       throw StateError('Task already started.');
+    }
 
     // Merely creating this port object will cause the VM to stay alive and keep
     // the VM service server running until the port is disposed of.
@@ -280,8 +283,9 @@ class _TaskRunner {
       // are catching errors coming from arbitrary (and untrustworthy) task
       // code. Our goal is to convert the failure into a readable message.
       // Propagating it further is not useful.
-      if (!completer.isCompleted)
+      if (!completer.isCompleted) {
         completer.complete(TaskResult.failure(message));
+      }
     });
     return completer.future;
   }

dev/devicelab/lib/framework/runner.dart

@@ -156,8 +156,9 @@ Future<TaskResult> runTask(
 }) async {
   final String taskExecutable = 'bin/tasks/$taskName.dart';
 
-  if (!file(taskExecutable).existsSync())
+  if (!file(taskExecutable).existsSync()) {
     throw 'Executable Dart file not found: $taskExecutable';
+  }
 
   final Process runner = await startProcess(
     dartBin,
@@ -190,8 +191,9 @@ Future<TaskResult> runTask(
       .listen((String line) {
     if (!uri.isCompleted) {
       final Uri? serviceUri = parseServiceUri(line, prefix: RegExp('(Observatory|The Dart VM service is) listening on '));
-      if (serviceUri != null)
+      if (serviceUri != null) {
         uri.complete(serviceUri);
+      }
     }
     if (!silent) {
       stdout.writeln('[$taskName] [STDOUT] $line');
@@ -255,12 +257,14 @@ Future<ConnectionResult> _connectToRunnerIsolate(Uri vmServiceUri) async {
       }
       final IsolateRef isolate = vm.isolates!.first;
       final Response response = await client.callServiceExtension('ext.cocoonRunnerReady', isolateId: isolate.id);
-      if (response.json!['response'] != 'ready')
+      if (response.json!['response'] != 'ready') {
         throw 'not ready yet';
+      }
       return ConnectionResult(client, isolate);
     } catch (error) {
-      if (stopwatch.elapsed > const Duration(seconds: 10))
+      if (stopwatch.elapsed > const Duration(seconds: 10)) {
         print('VM service still not ready after ${stopwatch.elapsed}: $error\nContinuing to retry...');
+      }
       await Future<void>.delayed(const Duration(milliseconds: 50));
     }
   }

dev/devicelab/lib/framework/utils.dart

@@ -126,14 +126,15 @@ void copy(File sourceFile, Directory targetDirectory, {String? name}) {
 }
 
 void recursiveCopy(Directory source, Directory target) {
-  if (!target.existsSync())
+  if (!target.existsSync()) {
     target.createSync();
+  }
 
   for (final FileSystemEntity entity in source.listSync(followLinks: false)) {
     final String name = path.basename(entity.path);
-    if (entity is Directory && !entity.path.contains('.dart_tool'))
+    if (entity is Directory && !entity.path.contains('.dart_tool')) {
       recursiveCopy(entity, Directory(path.join(target.path, name)));
-    else if (entity is File) {
+    } else if (entity is File) {
       final File dest = File(path.join(target.path, name));
       dest.writeAsBytesSync(entity.readAsBytesSync());
       // Preserve executable bit
@@ -194,8 +195,9 @@ void section(String title) {
     title = '╡ ••• $title ••• ╞';
     final String line = '═' * math.max((80 - title.length) ~/ 2, 2);
     output = '$line$title$line';
-    if (output.length == 79)
+    if (output.length == 79) {
       output += '═';
+    }
   }
   print('\n\n$output\n');
 }
@@ -209,10 +211,12 @@ Future<String> getDartVersion() async {
   //   Dart VM version: 1.17.0-dev.2.0 (Tue May  3 12:14:52 2016) on "macos_x64"
   // to:
   //   1.17.0-dev.2.0
-  if (version.contains('('))
+  if (version.contains('(')) {
     version = version.substring(0, version.indexOf('(')).trim();
-  if (version.contains(':'))
+  }
+  if (version.contains(':')) {
     version = version.substring(version.indexOf(':') + 1).trim();
+  }
 
   return version.replaceAll('"', "'");
 }
@@ -295,8 +299,9 @@ Future<Process> startProcess(
 }
 
 Future<void> forceQuitRunningProcesses() async {
-  if (_runningProcesses.isEmpty)
+  if (_runningProcesses.isEmpty) {
     return;
+  }
 
   // Give normally quitting processes a chance to report their exit code.
   await Future<void>.delayed(const Duration(seconds: 1));
@@ -354,8 +359,9 @@ Future<int> _execute(
   );
   final int exitCode = await process.exitCode;
 
-  if (exitCode != 0 && !canFail)
+  if (exitCode != 0 && !canFail) {
     fail('Executable "$executable" failed with exit code $exitCode.');
+  }
 
   return exitCode;
 }
@@ -545,8 +551,9 @@ Future<String?> findJavaHome() async {
       'Java binary at: ',
       from: await evalFlutter('doctor', options: <String>['-v']),
     );
-    if (hits.isEmpty)
+    if (hits.isEmpty) {
       return null;
+    }
     final String javaBinary = hits.first
         .split(': ')
         .last;
@@ -579,8 +586,9 @@ void cd(dynamic directory) {
     throw FileSystemException('Unsupported directory type ${directory.runtimeType}', directory.toString());
   }
 
-  if (!d.existsSync())
+  if (!d.existsSync()) {
     throw FileSystemException('Cannot cd into directory that does not exist', d.toString());
+  }
 }
 
 Directory get flutterDirectory => Directory.current.parent.parent;
@@ -590,15 +598,17 @@ Directory get openpayDirectory => Directory(requireEnvVar('OPENPAY_CHECKOUT_PATH
 String requireEnvVar(String name) {
   final String? value = Platform.environment[name];
 
-  if (value == null)
+  if (value == null) {
     fail('$name environment variable is missing. Quitting.');
+  }
 
   return value!;
 }
 
 T requireConfigProperty<T>(Map<String, dynamic> map, String propertyName) {
-  if (!map.containsKey(propertyName))
+  if (!map.containsKey(propertyName)) {
     fail('Configuration property not found: $propertyName');
+  }
   final T result = map[propertyName] as T;
   return result;
 }
@@ -634,26 +644,36 @@ void checkNotNull(Object o1,
     Object o8 = 1,
     Object o9 = 1,
     Object o10 = 1]) {
-  if (o1 == null)
+  if (o1 == null) {
     throw 'o1 is null';
-  if (o2 == null)
+  }
+  if (o2 == null) {
     throw 'o2 is null';
-  if (o3 == null)
+  }
+  if (o3 == null) {
     throw 'o3 is null';
-  if (o4 == null)
+  }
+  if (o4 == null) {
     throw 'o4 is null';
-  if (o5 == null)
+  }
+  if (o5 == null) {
     throw 'o5 is null';
-  if (o6 == null)
+  }
+  if (o6 == null) {
     throw 'o6 is null';
-  if (o7 == null)
+  }
+  if (o7 == null) {
     throw 'o7 is null';
-  if (o8 == null)
+  }
+  if (o8 == null) {
     throw 'o8 is null';
-  if (o9 == null)
+  }
+  if (o9 == null) {
     throw 'o9 is null';
-  if (o10 == null)
+  }
+  if (o10 == null) {
     throw 'o10 is null';
+  }
 }
 
 /// Splits [from] into lines and selects those that contain [pattern].

dev/devicelab/lib/microbenchmarks.dart

@@ -74,8 +74,9 @@ Future<Map<String, double>> readJsonResults(Process process) {
       return;
     }
 
-    if (jsonStarted && line.contains(jsonPrefix))
+    if (jsonStarted && line.contains(jsonPrefix)) {
       jsonBuf.writeln(line.substring(line.indexOf(jsonPrefix) + jsonPrefix.length));
+    }
   });
 
   process.exitCode.then<void>((int code) async {

dev/devicelab/lib/tasks/perf_tests.dart

@@ -288,8 +288,9 @@ TaskFunction createBasicMaterialCompileTest() {
       await flutter('create', options: <String>['--template=app', sampleAppName]);
     });
 
-    if (!sampleDir.existsSync())
+    if (!sampleDir.existsSync()) {
       throw 'Failed to create default Flutter app in ${sampleDir.path}';
+    }
 
     return CompileTest(sampleDir.path).run();
   };
@@ -754,8 +755,9 @@ class StartupTest {
 
       final Map<String, dynamic> averageResults = _average(results, iterations);
 
-      if (!reportMetrics)
+      if (!reportMetrics) {
         return TaskResult.success(averageResults);
+      }
 
       return TaskResult.success(averageResults, benchmarkScoreKeys: <String>[
         'timeToFirstFrameMicros',
@@ -860,8 +862,9 @@ class DevtoolsStartupTest {
         device.deviceId,
       ]);
 
-      if (sawLine)
+      if (sawLine) {
         return TaskResult.success(null, benchmarkScoreKeys: <String>[]);
+      }
       return TaskResult.failure('Did not see line "The Flutter DevTools debugger and profiler" in output');
     });
   }
@@ -1401,8 +1404,9 @@ class CompileTest {
         // IPAs are created manually, https://flutter.dev/ios-release/
         await exec('tar', <String>['-zcf', 'build/app.ipa', appPath]);
         releaseSizeInBytes = await file('$cwd/build/app.ipa').length();
-        if (reportPackageContentSizes)
+        if (reportPackageContentSizes) {
           metrics.addAll(await getSizesFromIosApp(appPath));
+        }
         break;
       case DeviceOperatingSystem.android:
       case DeviceOperatingSystem.androidArm:
@@ -1416,8 +1420,9 @@ class CompileTest {
         final String apkPath = '$cwd/build/app/outputs/flutter-apk/app-release.apk';
         final File apk = file(apkPath);
         releaseSizeInBytes = apk.lengthSync();
-        if (reportPackageContentSizes)
+        if (reportPackageContentSizes) {
           metrics.addAll(await getSizesFromApk(apkPath));
+        }
         break;
       case DeviceOperatingSystem.androidArm64:
         options.insert(0, 'apk');
@@ -1430,8 +1435,9 @@ class CompileTest {
         final String apkPath = '$cwd/build/app/outputs/flutter-apk/app-release.apk';
         final File apk = file(apkPath);
         releaseSizeInBytes = apk.lengthSync();
-        if (reportPackageContentSizes)
+        if (reportPackageContentSizes) {
           metrics.addAll(await getSizesFromApk(apkPath));
+        }
         break;
       case DeviceOperatingSystem.fake:
         throw Exception('Unsupported option for fake devices');
@@ -1572,8 +1578,9 @@ class MemoryTest {
 
       final StreamSubscription<String> adb = device!.logcat.listen(
         (String data) {
-          if (data.contains('==== MEMORY BENCHMARK ==== $_nextMessage ===='))
+          if (data.contains('==== MEMORY BENCHMARK ==== $_nextMessage ====')) {
             _receivedNextMessage?.complete();
+          }
         },
       );
 
@@ -1764,8 +1771,9 @@ class ReportedDurationTest {
 
       final StreamSubscription<String> adb = device!.logcat.listen(
         (String data) {
-          if (durationPattern.hasMatch(data))
+          if (durationPattern.hasMatch(data)) {
             durationCompleter.complete(int.parse(durationPattern.firstMatch(data)!.group(1)!));
+          }
         },
       );
       print('launching $project$test on device...');

dev/devicelab/test/adb_test.dart

@@ -158,8 +158,9 @@ class CommandArgs {
 
   @override
   bool operator==(Object other) {
-    if (other.runtimeType != CommandArgs)
+    if (other.runtimeType != CommandArgs) {
       return false;
+    }
     return other is CommandArgs
         && other.command == command
         && const ListEquality<String>().equals(other.arguments, arguments)

dev/integration_tests/android_semantics_testing/lib/main.dart

@@ -33,10 +33,11 @@ Future<String> dataHandler(String message) async {
       });
       completer.complete(json.encode(result));
     }
-    if (SchedulerBinding.instance.hasScheduledFrame)
+    if (SchedulerBinding.instance.hasScheduledFrame) {
       SchedulerBinding.instance.addPostFrameCallback(completeSemantics);
-    else
+    } else {
       completeSemantics();
+    }
     return completer.future;
   }
   if (message.contains('setClipboard')) {
@@ -48,10 +49,11 @@ Future<String> dataHandler(String message) async {
       });
       completer.complete('');
     }
-    if (SchedulerBinding.instance.hasScheduledFrame)
+    if (SchedulerBinding.instance.hasScheduledFrame) {
       SchedulerBinding.instance.addPostFrameCallback(completeSetClipboard);
-    else
+    } else {
       completeSetClipboard();
+    }
     return completer.future;
   }
   throw UnimplementedError();

dev/integration_tests/android_semantics_testing/lib/src/common.dart

@@ -187,8 +187,9 @@ class Rect {
 
   @override
   bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is Rect
         && other.top == top
         && other.left == left
@@ -219,8 +220,9 @@ class Size {
 
   @override
   bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is Size
         && other.width == width
         && other.height == height;

dev/integration_tests/android_semantics_testing/lib/src/constants.dart

@@ -201,8 +201,9 @@ class AndroidSemanticsAction {
 
   @override
   bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is AndroidSemanticsAction
         && other.id == id;
   }

dev/integration_tests/android_semantics_testing/lib/src/matcher.dart

@@ -100,53 +100,74 @@ class _AndroidSemanticsMatcher extends Matcher {
   @override
   Description describe(Description description) {
     description.add('AndroidSemanticsNode');
-    if (text != null)
+    if (text != null) {
       description.add(' with text: $text');
-    if (contentDescription != null)
+    }
+    if (contentDescription != null) {
       description.add( 'with contentDescription $contentDescription');
-    if (className != null)
+    }
+    if (className != null) {
       description.add(' with className: $className');
-    if (id != null)
+    }
+    if (id != null) {
       description.add(' with id: $id');
-    if (actions != null)
+    }
+    if (actions != null) {
       description.add(' with actions: $actions');
-    if (rect != null)
+    }
+    if (rect != null) {
       description.add(' with rect: $rect');
-    if (size != null)
+    }
+    if (size != null) {
       description.add(' with size: $size');
-    if (isChecked != null)
+    }
+    if (isChecked != null) {
       description.add(' with flag isChecked: $isChecked');
-    if (isEditable != null)
+    }
+    if (isEditable != null) {
       description.add(' with flag isEditable: $isEditable');
-    if (isEnabled != null)
+    }
+    if (isEnabled != null) {
       description.add(' with flag isEnabled: $isEnabled');
-    if (isFocusable != null)
+    }
+    if (isFocusable != null) {
       description.add(' with flag isFocusable: $isFocusable');
-    if (isFocused != null)
+    }
+    if (isFocused != null) {
       description.add(' with flag isFocused: $isFocused');
-    if (isHeading != null)
+    }
+    if (isHeading != null) {
       description.add(' with flag isHeading: $isHeading');
-    if (isPassword != null)
+    }
+    if (isPassword != null) {
       description.add(' with flag isPassword: $isPassword');
-    if (isLongClickable != null)
+    }
+    if (isLongClickable != null) {
       description.add(' with flag isLongClickable: $isLongClickable');
+    }
     return description;
   }
 
   @override
   bool matches(covariant AndroidSemanticsNode item, Map<Object, Object> matchState) {
-    if (text != null && text != item.text)
+    if (text != null && text != item.text) {
       return _failWithMessage('Expected text: $text', matchState);
-    if (contentDescription != null && contentDescription != item.contentDescription)
+    }
+    if (contentDescription != null && contentDescription != item.contentDescription) {
       return _failWithMessage('Expected contentDescription: $contentDescription', matchState);
-    if (className != null && className != item.className)
+    }
+    if (className != null && className != item.className) {
       return _failWithMessage('Expected className: $className', matchState);
-    if (id != null && id != item.id)
+    }
+    if (id != null && id != item.id) {
       return _failWithMessage('Expected id: $id', matchState);
-    if (rect != null && rect != item.getRect())
+    }
+    if (rect != null && rect != item.getRect()) {
       return _failWithMessage('Expected rect: $rect', matchState);
-    if (size != null && size != item.getSize())
+    }
+    if (size != null && size != item.getSize()) {
       return _failWithMessage('Expected size: $size', matchState);
+    }
     if (actions != null) {
       final List<AndroidSemanticsAction> itemActions = item.getActions();
       if (!unorderedEquals(actions).matches(itemActions, matchState)) {
@@ -161,25 +182,34 @@ class _AndroidSemanticsMatcher extends Matcher {
         return _failWithMessage('Expected actions: $actionsString\nActual actions: $itemActionsString\nUnexpected: $unexpectedInString\nMissing: $missingInString', matchState);
       }
     }
-    if (isChecked != null && isChecked != item.isChecked)
+    if (isChecked != null && isChecked != item.isChecked) {
       return _failWithMessage('Expected isChecked: $isChecked', matchState);
-    if (isCheckable != null && isCheckable != item.isCheckable)
+    }
+    if (isCheckable != null && isCheckable != item.isCheckable) {
       return _failWithMessage('Expected isCheckable: $isCheckable', matchState);
-    if (isEditable != null && isEditable != item.isEditable)
+    }
+    if (isEditable != null && isEditable != item.isEditable) {
       return _failWithMessage('Expected isEditable: $isEditable', matchState);
-    if (isEnabled != null && isEnabled != item.isEnabled)
+    }
+    if (isEnabled != null && isEnabled != item.isEnabled) {
       return _failWithMessage('Expected isEnabled: $isEnabled', matchState);
-    if (isFocusable != null && isFocusable != item.isFocusable)
+    }
+    if (isFocusable != null && isFocusable != item.isFocusable) {
       return _failWithMessage('Expected isFocusable: $isFocusable', matchState);
-    if (isFocused != null && isFocused != item.isFocused)
+    }
+    if (isFocused != null && isFocused != item.isFocused) {
       return _failWithMessage('Expected isFocused: $isFocused', matchState);
+    }
     // Heading is not available in all Android versions, so match anything if it is not set by the platform
-    if (isHeading != null && isHeading != item.isHeading && item.isHeading != null)
+    if (isHeading != null && isHeading != item.isHeading && item.isHeading != null) {
       return _failWithMessage('Expected isHeading: $isHeading', matchState);
-    if (isPassword != null && isPassword != item.isPassword)
+    }
+    if (isPassword != null && isPassword != item.isPassword) {
       return _failWithMessage('Expected isPassword: $isPassword', matchState);
-    if (isLongClickable != null && isLongClickable != item.isLongClickable)
+    }
+    if (isLongClickable != null && isLongClickable != item.isLongClickable) {
       return _failWithMessage('Expected longClickable: $isLongClickable', matchState);
+    }
     return true;
   }
 

dev/integration_tests/android_views/lib/motion_event_diff.dart

@@ -47,17 +47,19 @@ void diffActions(StringBuffer diffBuffer, Map<String, dynamic> originalEvent,
   final String originalActionName =
       getActionName(originalActionMasked, originalEvent['action'] as int);
 
-  if (synthesizedActionMasked != originalActionMasked)
+  if (synthesizedActionMasked != originalActionMasked) {
     diffBuffer.write(
         'action (expected: $originalActionName actual: $synthesizedActionName) ');
+  }
 
   if (kPointerActions.contains(originalActionMasked) &&
       originalActionMasked == synthesizedActionMasked) {
     final int originalPointer = getPointerIdx(originalEvent['action'] as int);
     final int synthesizedPointer = getPointerIdx(synthesizedEvent['action'] as int);
-    if (originalPointer != synthesizedPointer)
+    if (originalPointer != synthesizedPointer) {
       diffBuffer.write(
           'pointerIdx (expected: $originalPointer actual: $synthesizedPointer action: $originalActionName ');
+    }
   }
 }
 
@@ -123,10 +125,12 @@ void diffMaps(
     return;
   }
   for (final String key in expected.keys) {
-    if (excludeKeys.contains(key))
+    if (excludeKeys.contains(key)) {
       continue;
-    if (doublesApproximatelyMatch(expected[key], actual[key]))
+    }
+    if (doublesApproximatelyMatch(expected[key], actual[key])) {
       continue;
+    }
 
     if (expected[key] != actual[key]) {
       diffBuffer.write(
@@ -155,10 +159,11 @@ String getActionName(int actionMasked, int action) {
     'BUTTON_PRESS',
     'BUTTON_RELEASE',
   ];
-  if (actionMasked < actionNames.length)
+  if (actionMasked < actionNames.length) {
     return '${actionNames[actionMasked]}($action)';
-  else
+  } else {
     return 'ACTION_$actionMasked';
+  }
 }
 
 bool doublesApproximatelyMatch(dynamic a, dynamic b) =>

dev/integration_tests/android_views/lib/motion_events_page.dart

@@ -146,16 +146,19 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
       await channel.invokeMethod<void>('stopFlutterViewEvents');
       await viewChannel?.invokeMethod<void>('stopTouchEvents');
 
-      if (flutterViewEvents.length != embeddedViewEvents.length)
+      if (flutterViewEvents.length != embeddedViewEvents.length) {
         return 'Synthesized ${flutterViewEvents.length} events but the embedded view received ${embeddedViewEvents.length} events';
+      }
 
       final StringBuffer diff = StringBuffer();
       for (int i = 0; i < flutterViewEvents.length; ++i) {
         final String currentDiff = diffMotionEvents(flutterViewEvents[i], embeddedViewEvents[i]);
-        if (currentDiff.isEmpty)
+        if (currentDiff.isEmpty) {
           continue;
-        if (diff.isNotEmpty)
+        }
+        if (diff.isNotEmpty) {
           diff.write(', ');
+        }
         diff.write(currentDiff);
       }
       return diff.toString();
@@ -229,8 +232,9 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
       case 'onTouch':
         final Map<dynamic, dynamic> map = call.arguments as Map<dynamic, dynamic>;
         flutterViewEvents.insert(0, map.cast<String, dynamic>());
-        if (flutterViewEvents.length > kEventsBufferSize)
+        if (flutterViewEvents.length > kEventsBufferSize) {
           flutterViewEvents.removeLast();
+        }
         setState(() {});
         break;
     }
@@ -242,8 +246,9 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
       case 'onTouch':
         final Map<dynamic, dynamic> map = call.arguments as Map<dynamic, dynamic>;
         embeddedViewEvents.insert(0, map.cast<String, dynamic>());
-        if (embeddedViewEvents.length > kEventsBufferSize)
+        if (embeddedViewEvents.length > kEventsBufferSize) {
           embeddedViewEvents.removeLast();
+        }
         setState(() {});
         break;
     }
@@ -251,9 +256,10 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
   }
 
   Widget buildEventTile(BuildContext context, int index) {
-    if (embeddedViewEvents.length > index)
+    if (embeddedViewEvents.length > index) {
       return TouchEventDiff(
           flutterViewEvents[index], embeddedViewEvents[index]);
+    }
     return Text(
         'Unmatched event, action: ${flutterViewEvents[index]['action']}');
   }

dev/integration_tests/channels/lib/main.dart

@@ -172,10 +172,11 @@ class _TestAppState extends State<TestApp> {
 
   void _executeNextStep() {
     setState(() {
-      if (_step < steps.length)
+      if (_step < steps.length) {
         _result = steps[_step++]();
-      else
+      } else {
         _result = Future<TestStepResult>.value(TestStepResult.complete);
+      }
     });
   }
 

dev/integration_tests/channels/lib/src/basic_messaging.dart

@@ -169,10 +169,11 @@ Future<TestStepResult> _basicMessageToUnknownChannel<T>(
 }
 
 String toString(dynamic message) {
-  if (message is ByteData)
+  if (message is ByteData) {
     return message.buffer
         .asUint8List(message.offsetInBytes, message.lengthInBytes)
         .toString();
-  else
+  } else {
     return '$message';
+  }
 }

dev/integration_tests/channels/lib/src/test_step.dart

@@ -101,8 +101,9 @@ Future<TestStepResult> resultOfHandshake(
   dynamic error,
 ) async {
   assert(message != nothing);
-  while (received.length < 2)
+  while (received.length < 2) {
     received.add(nothing);
+  }
   TestStatus status;
   if (!_deepEquals(messageEcho, message) ||
       received.length != 2 ||
@@ -127,27 +128,34 @@ Future<TestStepResult> resultOfHandshake(
 }
 
 String _toString(dynamic message) {
-  if (message is ByteData)
+  if (message is ByteData) {
     return message.buffer
         .asUint8List(message.offsetInBytes, message.lengthInBytes)
         .toString();
-  else
+  } else {
     return '$message';
+  }
 }
 
 bool _deepEquals(dynamic a, dynamic b) {
-  if (a == b)
+  if (a == b) {
     return true;
-  if (a is double && a.isNaN)
+  }
+  if (a is double && a.isNaN) {
     return b is double && b.isNaN;
-  if (a is ByteData)
+  }
+  if (a is ByteData) {
     return b is ByteData && _deepEqualsByteData(a, b);
-  if (a is List)
+  }
+  if (a is List) {
     return b is List && _deepEqualsList(a, b);
-  if (a is Map)
+  }
+  if (a is Map) {
     return b is Map && _deepEqualsMap(a, b);
-  if (a is Pair)
+  }
+  if (a is Pair) {
     return b is Pair && _deepEqualsPair(a, b);
+  }
   return false;
 }
 
@@ -159,21 +167,25 @@ bool _deepEqualsByteData(ByteData a, ByteData b) {
 }
 
 bool _deepEqualsList(List<dynamic> a, List<dynamic> b) {
-  if (a.length != b.length)
+  if (a.length != b.length) {
     return false;
+  }
   for (int i = 0; i < a.length; i++) {
-    if (!_deepEquals(a[i], b[i]))
+    if (!_deepEquals(a[i], b[i])) {
       return false;
+    }
   }
   return true;
 }
 
 bool _deepEqualsMap(Map<dynamic, dynamic> a, Map<dynamic, dynamic> b) {
-  if (a.length != b.length)
+  if (a.length != b.length) {
     return false;
+  }
   for (final dynamic key in a.keys) {
-    if (!b.containsKey(key) || !_deepEquals(a[key], b[key]))
+    if (!b.containsKey(key) || !_deepEquals(a[key], b[key])) {
       return false;
+    }
   }
   return true;
 }

dev/integration_tests/external_ui/lib/main.dart

@@ -115,8 +115,9 @@ Press play to produce texture frames.''';
           _state = FrameState.initial;
         });
       } else {
-        if ((tickCount % (calibrationTickCount ~/ 20)) == 0)
+        if ((tickCount % (calibrationTickCount ~/ 20)) == 0) {
           debugPrint('Calibrating... ${(100.0 * tickCount / calibrationTickCount).floor()}%');
+        }
       }
     });
     ticker.start();

dev/integration_tests/flutter_gallery/lib/demo/animation/home.dart

@@ -44,8 +44,9 @@ class _RenderStatusBarPaddingSliver extends RenderSliver {
   double _maxHeight;
   set maxHeight(double value) {
     assert(maxHeight >= 0.0);
-    if (_maxHeight == value)
+    if (_maxHeight == value) {
       return;
+    }
     _maxHeight = value;
     markNeedsLayout();
   }
@@ -56,8 +57,9 @@ class _RenderStatusBarPaddingSliver extends RenderSliver {
   double _scrollFactor;
   set scrollFactor(double value) {
     assert(scrollFactor >= 1.0);
-    if (_scrollFactor == value)
+    if (_scrollFactor == value) {
       return;
+    }
     _scrollFactor = value;
     markNeedsLayout();
   }
@@ -390,22 +392,27 @@ class _SnappingScrollPhysics extends ClampingScrollPhysics {
       // then snap it there. Similarly if the simulation is headed down past
       // midScrollOffset but will not reach zero, then snap it to zero.
       final double simulationEnd = simulation.x(double.infinity);
-      if (simulationEnd >= midScrollOffset)
+      if (simulationEnd >= midScrollOffset) {
         return simulation;
-      if (dragVelocity > 0.0)
+      }
+      if (dragVelocity > 0.0) {
         return _toMidScrollOffsetSimulation(offset, dragVelocity);
-      if (dragVelocity < 0.0)
+      }
+      if (dragVelocity < 0.0) {
         return _toZeroScrollOffsetSimulation(offset, dragVelocity);
+      }
     } else {
       // The user ended the drag with little or no velocity. If they
       // didn't leave the offset above midScrollOffset, then
       // snap to midScrollOffset if they're more than halfway there,
       // otherwise snap to zero.
       final double snapThreshold = midScrollOffset / 2.0;
-      if (offset >= snapThreshold && offset < midScrollOffset)
+      if (offset >= snapThreshold && offset < midScrollOffset) {
         return _toMidScrollOffsetSimulation(offset, dragVelocity);
-      if (offset > 0.0 && offset < snapThreshold)
+      }
+      if (offset > 0.0 && offset < snapThreshold) {
         return _toZeroScrollOffsetSimulation(offset, dragVelocity);
+      }
     }
     return simulation;
   }
@@ -439,10 +446,11 @@ class _AnimationDemoHomeState extends State<AnimationDemoHome> {
   }
 
   void _handleBackButton(double midScrollOffset) {
-    if (_scrollController.offset >= midScrollOffset)
+    if (_scrollController.offset >= midScrollOffset) {
       _scrollController.animateTo(0.0, curve: _kScrollCurve, duration: _kScrollDuration);
-    else
+    } else {
       Navigator.maybePop(context);
+    }
   }
 
   // Only enable paging for the heading when the user has scrolled to midScrollOffset.
@@ -478,8 +486,9 @@ class _AnimationDemoHomeState extends State<AnimationDemoHome> {
   bool _handlePageNotification(ScrollNotification notification, PageController leader, PageController follower) {
     if (notification.depth == 0 && notification is ScrollUpdateNotification) {
       selectedIndex.value = leader.page;
-      if (follower.page != leader.page)
+      if (follower.page != leader.page) {
         follower.position.jumpToWithoutSettling(leader.position.pixels); // ignore: deprecated_member_use
+      }
     }
     return false;
   }

dev/integration_tests/flutter_gallery/lib/demo/calculator/logic.dart

@@ -35,10 +35,12 @@ class FloatToken extends NumberToken {
 
   static double _parse(String stringRep) {
     String toParse = stringRep;
-    if (toParse.startsWith('.'))
+    if (toParse.startsWith('.')) {
       toParse = '0$toParse';
-    if (toParse.endsWith('.'))
+    }
+    if (toParse.endsWith('.')) {
       toParse = '${toParse}0';
+    }
     return double.parse(toParse);
   }
 }
@@ -51,8 +53,9 @@ class ResultToken extends NumberToken {
   /// floating point number is guaranteed to have at least this many
   /// decimal digits of precision.
   static num round(num number) {
-    if (number is int)
+    if (number is int) {
       return number;
+    }
     return double.parse(number.toStringAsPrecision(14));
   }
 }
@@ -330,10 +333,11 @@ class CalcExpression {
       // Remove the next number token.
       final NumberToken nextNumToken = list.removeAt(0)! as NumberToken;
       final num nextNumber = nextNumToken.number;
-      if (isDivision)
+      if (isDivision) {
         currentValue /= nextNumber;
-      else
+      } else {
         currentValue *= nextNumber;
+      }
     }
     return currentValue;
   }

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

@@ -294,23 +294,26 @@ class _BackdropDemoState extends State<BackdropDemo> with SingleTickerProviderSt
   // the user must either tap its heading or the backdrop's menu icon.
 
   void _handleDragUpdate(DragUpdateDetails details) {
-    if (_controller.isAnimating || _controller.status == AnimationStatus.completed)
+    if (_controller.isAnimating || _controller.status == AnimationStatus.completed) {
       return;
+    }
 
     _controller.value -= details.primaryDelta! / _backdropHeight;
   }
 
   void _handleDragEnd(DragEndDetails details) {
-    if (_controller.isAnimating || _controller.status == AnimationStatus.completed)
+    if (_controller.isAnimating || _controller.status == AnimationStatus.completed) {
       return;
+    }
 
     final double flingVelocity = details.velocity.pixelsPerSecond.dy / _backdropHeight;
-    if (flingVelocity < 0.0)
+    if (flingVelocity < 0.0) {
       _controller.fling(velocity: math.max(2.0, -flingVelocity));
-    else if (flingVelocity > 0.0)
+    } else if (flingVelocity > 0.0) {
       _controller.fling(velocity: math.min(-2.0, -flingVelocity));
-    else
+    } 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/bottom_app_bar_demo.dart

@@ -204,12 +204,15 @@ class _BottomAppBarDemoState extends State<BottomAppBarDemo> {
   }
 
   NotchedShape? _selectNotch() {
-    if (!_showNotch.value!)
+    if (!_showNotch.value!) {
       return null;
-    if (_fabShape == kCircularFab)
+    }
+    if (_fabShape == kCircularFab) {
       return const CircularNotchedRectangle();
-    if (_fabShape == kDiamondFab)
+    }
+    if (_fabShape == kDiamondFab) {
       return const _DiamondNotchedRectangle();
+    }
     return null;
   }
 }
@@ -452,8 +455,9 @@ class _DiamondNotchedRectangle implements NotchedShape {
 
   @override
   Path getOuterPath(Rect host, Rect? guest) {
-    if (!host.overlaps(guest!))
+    if (!host.overlaps(guest!)) {
       return Path()..addRect(host);
+    }
     assert(guest.width > 0.0);
 
     final Rect intersection = guest.intersect(host);

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

@@ -165,8 +165,9 @@ class _BottomNavigationDemoState extends State<BottomNavigationDemo>
 
   @override
   void dispose() {
-    for (final NavigationIconView view in _navigationViews)
+    for (final NavigationIconView view in _navigationViews) {
       view.controller.dispose();
+    }
     super.dispose();
   }
 

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

@@ -97,8 +97,9 @@ class DessertDataSource extends DataTableSource {
   @override
   DataRow? getRow(int index) {
     assert(index >= 0);
-    if (index >= _desserts.length)
+    if (index >= _desserts.length) {
       return null;
+    }
     final Dessert dessert = _desserts[index];
     return DataRow.byIndex(
       index: index,
@@ -134,8 +135,9 @@ class DessertDataSource extends DataTableSource {
   int get selectedRowCount => _selectedCount;
 
   void _selectAll(bool? checked) {
-    for (final Dessert dessert in _desserts)
+    for (final Dessert dessert in _desserts) {
       dessert.selected = checked;
+    }
     _selectedCount = checked! ? _desserts.length : 0;
     notifyListeners();
   }

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

@@ -66,8 +66,9 @@ class _DateTimePicker extends StatelessWidget {
       firstDate: DateTime(2015, 8),
       lastDate: DateTime(2101),
     );
-    if (picked != null && picked != selectedDate)
+    if (picked != null && picked != selectedDate) {
       selectDate!(picked);
+    }
   }
 
   Future<void> _selectTime(BuildContext context) async {
@@ -75,8 +76,9 @@ class _DateTimePicker extends StatelessWidget {
       context: context,
       initialTime: selectedTime!,
     );
-    if (picked != null && picked != selectedTime)
+    if (picked != null && picked != selectedTime) {
       selectTime!(picked);
+    }
   }
 
   @override

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

@@ -144,10 +144,11 @@ class _DrawerDemoState extends State<DrawerDemo> with TickerProviderStateMixin {
               margin: EdgeInsets.zero,
               onDetailsPressed: () {
                 _showDrawerContents = !_showDrawerContents;
-                if (_showDrawerContents)
+                if (_showDrawerContents) {
                   _controller.reverse();
-                else
+                } else {
                   _controller.forward();
+                }
               },
             ),
             MediaQuery.removePadding(

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

@@ -46,8 +46,9 @@ class DateTimeItem extends StatelessWidget {
                     lastDate: date.add(const Duration(days: 30)),
                   )
                   .then((DateTime? value) {
-                    if (value != null)
+                    if (value != null) {
                       onChanged(DateTime(value.year, value.month, value.day, time.hour, time.minute));
+                    }
                   });
                 },
                 child: Row(
@@ -73,8 +74,9 @@ class DateTimeItem extends StatelessWidget {
                   initialTime: time,
                 )
                 .then((TimeOfDay? value) {
-                  if (value != null)
+                  if (value != null) {
                     onChanged(DateTime(date.year, date.month, date.day, value.hour, value.minute));
+                  }
                 });
               },
               child: Row(
@@ -109,8 +111,9 @@ class FullScreenDialogDemoState extends State<FullScreenDialogDemo> {
 
   Future<bool> _onWillPop() async {
     _saveNeeded = _hasLocation || _hasName || _saveNeeded;
-    if (!_saveNeeded)
+    if (!_saveNeeded) {
       return true;
+    }
 
     final ThemeData theme = Theme.of(context);
     final TextStyle dialogTextStyle = theme.textTheme.subtitle1!.copyWith(color: theme.textTheme.caption!.color);

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

@@ -118,8 +118,9 @@ class _GridPhotoViewerState extends State<GridPhotoViewer> with SingleTickerProv
 
   void _handleOnScaleEnd(ScaleEndDetails details) {
     final double magnitude = details.velocity.pixelsPerSecond.distance;
-    if (magnitude < _kMinFlingVelocity)
+    if (magnitude < _kMinFlingVelocity) {
       return;
+    }
     final Offset direction = details.velocity.pixelsPerSecond / magnitude;
     final double distance = (Offset.zero & context.size!).shortestSide;
     _flingAnimation = _controller.drive(Tween<Offset>(

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

@@ -222,10 +222,11 @@ class _LeaveBehindListItem extends StatelessWidget {
         key: ObjectKey(item),
         direction: dismissDirection,
         onDismissed: (DismissDirection direction) {
-          if (direction == DismissDirection.endToStart)
+          if (direction == DismissDirection.endToStart) {
             _handleArchive();
-          else
+          } else {
             _handleDelete();
+          }
         },
         confirmDismiss: !confirmDismiss ? null : (DismissDirection dismissDirection) async {
           switch(dismissDirection) {

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

@@ -224,8 +224,9 @@ class _ListDemoState extends State<ListDemo> {
     }
 
     Iterable<Widget> listTiles = items.map<Widget>((String item) => buildListTile(context, item));
-    if (_showDividers != null)
+    if (_showDividers != null) {
       listTiles = ListTile.divideTiles(context: context, tiles: listTiles);
+    }
 
     return Scaffold(
       key: scaffoldKey,

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

@@ -42,16 +42,18 @@ class MenuDemoState extends State<MenuDemo> {
   }
 
   void showMenuSelection(String value) {
-    if (<String>[_simpleValue1, _simpleValue2, _simpleValue3].contains(value))
+    if (<String>[_simpleValue1, _simpleValue2, _simpleValue3].contains(value)) {
       setState(() => _simpleValue = value);
+    }
     showInSnackBar('You selected: $value');
   }
 
   void showCheckedMenuSelections(String value) {
-    if (_checkedValues.contains(value))
+    if (_checkedValues.contains(value)) {
       _checkedValues.remove(value);
-    else
+    } else {
       _checkedValues.add(value);
+    }
 
     showInSnackBar('Checked $_checkedValues');
   }

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

@@ -29,8 +29,9 @@ class OverscrollDemoState extends State<OverscrollDemo> {
     final Completer<void> completer = Completer<void>();
     Timer(const Duration(seconds: 3), () => completer.complete());
     return completer.future.then((_) {
-      if (!mounted)
+      if (!mounted) {
         return;
+      }
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(
         content: const Text('Refresh complete'),
         action: SnackBarAction(

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

@@ -13,8 +13,9 @@ class _PageSelector extends StatelessWidget {
 
   void _handleArrowButtonPress(BuildContext context, int delta) {
     final TabController controller = DefaultTabController.of(context)!;
-    if (!controller.indexIsChanging)
+    if (!controller.indexIsChanging) {
       controller.animateTo((controller.index + delta).clamp(0, icons!.length - 1));
+    }
   }
 
   @override

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

@@ -33,10 +33,11 @@ class _ProgressIndicatorDemoState extends State<ProgressIndicatorDemo> with Sing
       curve: const Interval(0.0, 0.9, curve: Curves.fastOutSlowIn),
       reverseCurve: Curves.fastOutSlowIn,
     )..addStatusListener((AnimationStatus status) {
-      if (status == AnimationStatus.dismissed)
+      if (status == AnimationStatus.dismissed) {
         _controller.forward();
-      else if (status == AnimationStatus.completed)
+      } else if (status == AnimationStatus.completed) {
         _controller.reverse();
+      }
     });
   }
 

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

@@ -68,8 +68,9 @@ class ScrollableTabsDemoState extends State<ScrollableTabsDemo> with SingleTicke
   }
 
   Decoration? getIndicator() {
-    if (!_customIndicator)
+    if (!_customIndicator) {
       return const UnderlineTabIndicator();
+    }
 
     switch(_demoStyle) {
       case TabsDemoStyle.iconsAndText:

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

@@ -107,8 +107,9 @@ class _TabsFabDemoState extends State<TabsFabDemo> with SingleTickerProviderStat
   }
 
   Widget? buildFloatingActionButton(_Page page) {
-    if (!page.fabDefined)
+    if (!page.fabDefined) {
       return null;
+    }
 
     if (_extendedButtons) {
       return FloatingActionButton.extended(

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

@@ -112,36 +112,42 @@ class TextFormFieldDemoState extends State<TextFormFieldDemo> {
 
   String? _validateName(String? value) {
     _formWasEdited = true;
-    if (value!.isEmpty)
+    if (value!.isEmpty) {
       return 'Name is required.';
+    }
     final RegExp nameExp = RegExp(r'^[A-Za-z ]+$');
-    if (!nameExp.hasMatch(value))
+    if (!nameExp.hasMatch(value)) {
       return 'Please enter only alphabetical characters.';
+    }
     return null;
   }
 
   String? _validatePhoneNumber(String? value) {
     _formWasEdited = true;
     final RegExp phoneExp = RegExp(r'^\(\d\d\d\) \d\d\d\-\d\d\d\d$');
-    if (!phoneExp.hasMatch(value!))
+    if (!phoneExp.hasMatch(value!)) {
       return '(###) ###-#### - Enter a US phone number.';
+    }
     return null;
   }
 
   String? _validatePassword(String? value) {
     _formWasEdited = true;
     final FormFieldState<String> passwordField = _passwordFieldKey.currentState!;
-    if (passwordField.value == null || passwordField.value!.isEmpty)
+    if (passwordField.value == null || passwordField.value!.isEmpty) {
       return 'Please enter a password.';
-    if (passwordField.value != value)
+    }
+    if (passwordField.value != value) {
       return "The passwords don't match";
+    }
     return null;
   }
 
   Future<bool> _warnUserAboutInvalidData() async {
     final FormState? form = _formKey.currentState;
-    if (form == null || !_formWasEdited || form.validate())
+    if (form == null || !_formWasEdited || form.validate()) {
       return true;
+    }
 
     final bool? result = await showDialog<bool>(
       context: context,
@@ -313,30 +319,35 @@ class _UsNumberTextInputFormatter extends TextInputFormatter {
     final StringBuffer newText = StringBuffer();
     if (newTextLength >= 1) {
       newText.write('(');
-      if (newValue.selection.end >= 1)
+      if (newValue.selection.end >= 1) {
         selectionIndex++;
+      }
     }
     if (newTextLength >= 4) {
       final String value = newValue.text.substring(0, usedSubstringIndex = 3);
       newText.write('$value) ');
-      if (newValue.selection.end >= 3)
+      if (newValue.selection.end >= 3) {
         selectionIndex += 2;
+      }
     }
     if (newTextLength >= 7) {
       final String value = newValue.text.substring(3, usedSubstringIndex = 6);
       newText.write('$value-');
-      if (newValue.selection.end >= 6)
+      if (newValue.selection.end >= 6) {
         selectionIndex++;
+      }
     }
     if (newTextLength >= 11) {
       final String value = newValue.text.substring(6, usedSubstringIndex = 10);
       newText.write('$value ');
-      if (newValue.selection.end >= 10)
+      if (newValue.selection.end >= 10) {
         selectionIndex++;
+      }
     }
     // Dump the rest.
-    if (newTextLength >= usedSubstringIndex)
+    if (newTextLength >= usedSubstringIndex) {
       newText.write(newValue.text.substring(usedSubstringIndex));
+    }
     return TextEditingValue(
       text: newText.toString(),
       selection: TextSelection.collapsed(offset: selectionIndex),

dev/integration_tests/flutter_gallery/lib/demo/pesto_demo.dart

@@ -418,10 +418,11 @@ class _RecipePageState extends State<RecipePage> {
 
   void _toggleFavorite() {
     setState(() {
-      if (_favoriteRecipes.contains(widget.recipe))
+      if (_favoriteRecipes.contains(widget.recipe)) {
         _favoriteRecipes.remove(widget.recipe);
-      else
+      } else {
         _favoriteRecipes.add(widget.recipe);
+      }
     });
   }
 }

dev/integration_tests/flutter_gallery/lib/demo/shrine/expanding_bottom_sheet.dart

@@ -533,8 +533,9 @@ class ExtraProductsNumber extends StatelessWidget {
   }
 
   Widget _buildOverflow(AppStateModel model, BuildContext context) {
-    if (model.productsInCart.length <= 3)
+    if (model.productsInCart.length <= 3) {
       return Container();
+    }
 
     final int numOverflowProducts = _calculateOverflow(model);
     // Maximum of 99 so padding doesn't get messy.

dev/integration_tests/flutter_gallery/lib/demo/video_demo.dart

@@ -148,8 +148,9 @@ class VideoPlayPause extends StatefulWidget {
 class _VideoPlayPauseState extends State<VideoPlayPause> {
   _VideoPlayPauseState() {
     listener = () {
-      if (mounted)
+      if (mounted) {
         setState(() { });
+      }
     };
   }
 

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

@@ -241,16 +241,18 @@ class _BackdropState extends State<Backdrop> with SingleTickerProviderStateMixin
   }
 
   void _handleDragEnd(DragEndDetails details) {
-    if (_controller!.isAnimating || _controller!.status == AnimationStatus.completed)
+    if (_controller!.isAnimating || _controller!.status == AnimationStatus.completed) {
       return;
+    }
 
     final double flingVelocity = details.velocity.pixelsPerSecond.dy / _backdropHeight;
-    if (flingVelocity < 0.0)
+    if (flingVelocity < 0.0) {
       _controller!.fling(velocity: math.max(2.0, -flingVelocity));
-    else if (flingVelocity > 0.0)
+    } else if (flingVelocity > 0.0) {
       _controller!.fling(velocity: math.min(-2.0, -flingVelocity));
-    else
+    } else {
       _controller!.fling(velocity: _controller!.value < 0.5 ? -2.0 : 2.0);
+    }
   }
 
   void _toggleFrontLayer() {

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

@@ -28,8 +28,9 @@ class ComponentDemoTabData {
 
   @override
   bool operator==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is ComponentDemoTabData
         && other.tabName == tabName
         && other.description == description
@@ -67,8 +68,9 @@ class TabbedComponentDemoScaffold extends StatelessWidget {
 
   Future<void> _showApiDocumentation(BuildContext context) async {
     final String? url = demos![DefaultTabController.of(context)!.index].documentationUrl;
-    if (url == null)
+    if (url == null) {
       return;
+    }
 
     final Uri uri = Uri.parse(url);
     if (await canLaunchUrl(uri)) {

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

@@ -19,10 +19,12 @@ class GalleryDemoCategory {
 
   @override
   bool operator ==(Object other) {
-    if (identical(this, other))
+    if (identical(this, other)) {
       return true;
-    if (other.runtimeType != runtimeType)
+    }
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is GalleryDemoCategory
         && other.name == name
         && other.icon == icon;

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

@@ -99,8 +99,9 @@ DropdownButton<String>(
     // null indicates the user didn't select a
     // new value.
     setState(() {
-      if (newValue != null)
+      if (newValue != null) {
         dropdownValue = newValue;
+      }
     });
   },
   items: <String>['One', 'Two', 'Free', 'Four']

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

@@ -10,8 +10,9 @@ const String _kEndTag = '// END';
 Map<String?, String>? _exampleCode;
 
 Future<String?> getExampleCode(String? tag, AssetBundle bundle) async {
-  if (_exampleCode == null)
+  if (_exampleCode == null) {
     await _parseExampleCode(bundle);
+  }
   return _exampleCode![tag];
 }
 

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

@@ -57,8 +57,9 @@ class GalleryOptions {
 
   @override
   bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is GalleryOptions
         && other.themeMode == themeMode
         && other.textScaleFactor == textScaleFactor
@@ -480,8 +481,9 @@ class GalleryOptionsPage extends StatelessWidget {
   List<Widget> _enabledDiagnosticItems() {
     // Boolean showFoo options with a value of null: don't display
     // the showFoo option at all.
-    if (options == null)
+    if (options == null) {
       return const <Widget>[];
+    }
 
     return <Widget>[
       const Divider(),

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

@@ -13,8 +13,9 @@ class GalleryTextScaleValue {
 
   @override
   bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is GalleryTextScaleValue
         && other.scale == scale
         && other.label == label;
@@ -47,8 +48,9 @@ class GalleryVisualDensityValue {
 
   @override
   bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType)
+    if (other.runtimeType != runtimeType) {
       return false;
+    }
     return other is GalleryVisualDensityValue
         && other.visualDensity == visualDensity
         && other.label == label;

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

@@ -95,16 +95,18 @@ class DartSyntaxHighlighter extends SyntaxHighlighter {
       int currentPosition = 0;
 
       for (final _HighlightSpan span in _spans) {
-        if (currentPosition != span.start)
+        if (currentPosition != span.start) {
           formattedText.add(TextSpan(text: _src!.substring(currentPosition, span.start)));
+        }
 
         formattedText.add(TextSpan(style: span.textStyle(_style), text: span.textForSpan(_src!)));
 
         currentPosition = span.end;
       }
 
-      if (currentPosition != _src!.length)
+      if (currentPosition != _src!.length) {
         formattedText.add(TextSpan(text: _src!.substring(currentPosition, _src!.length)));
+      }
 
       return TextSpan(style: _style!.baseStyle, children: formattedText);
     } else {
@@ -149,8 +151,9 @@ class DartSyntaxHighlighter extends SyntaxHighlighter {
           endComment,
         ));
 
-        if (eof)
+        if (eof) {
           break;
+        }
 
         continue;
       }
@@ -260,17 +263,19 @@ class DartSyntaxHighlighter extends SyntaxHighlighter {
         _HighlightType? type;
 
         String word = _scanner.lastMatch![0]!;
-        if (word.startsWith('_'))
+        if (word.startsWith('_')) {
           word = word.substring(1);
+        }
 
-        if (_keywords.contains(word))
+        if (_keywords.contains(word)) {
           type = _HighlightType.keyword;
-        else if (_builtInTypes.contains(word))
+        } else if (_builtInTypes.contains(word)) {
           type = _HighlightType.keyword;
-        else if (_firstLetterIsUpperCase(word))
+        } else if (_firstLetterIsUpperCase(word)) {
           type = _HighlightType.klass;
-        else if (word.length >= 2 && word.startsWith('k') && _firstLetterIsUpperCase(word.substring(1)))
+        } else if (word.length >= 2 && word.startsWith('k') && _firstLetterIsUpperCase(word.substring(1))) {
           type = _HighlightType.constant;
+        }
 
         if (type != null) {
           _spans.add(_HighlightSpan(
@@ -336,21 +341,22 @@ class _HighlightSpan {
   }
 
   TextStyle? textStyle(SyntaxHighlighterStyle? style) {
-    if (type == _HighlightType.number)
+    if (type == _HighlightType.number) {
       return style!.numberStyle;
-    else if (type == _HighlightType.comment)
+    } else if (type == _HighlightType.comment) {
       return style!.commentStyle;
-    else if (type == _HighlightType.keyword)
+    } else if (type == _HighlightType.keyword) {
       return style!.keywordStyle;
-    else if (type == _HighlightType.string)
+    } else if (type == _HighlightType.string) {
       return style!.stringStyle;
-    else if (type == _HighlightType.punctuation)
+    } else if (type == _HighlightType.punctuation) {
       return style!.punctuationStyle;
-    else if (type == _HighlightType.klass)
+    } else if (type == _HighlightType.klass) {
       return style!.classStyle;
-    else if (type == _HighlightType.constant)
+    } else if (type == _HighlightType.constant) {
       return style!.constantStyle;
-    else
+    } else {
       return style!.baseStyle;
+    }
   }
 }

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

@@ -36,8 +36,9 @@ class UpdaterState extends State<Updater> {
 
     final String? updateUrl = await widget.updateUrlFetcher();
     final bool? wantsUpdate = await showDialog<bool>(context: context, builder: _buildDialog);
-    if (wantsUpdate != null && updateUrl != null && wantsUpdate)
+    if (wantsUpdate != null && updateUrl != null && wantsUpdate) {
       launchUrl(Uri.parse(updateUrl));
+    }
   }
 
   Widget _buildDialog(BuildContext context) {

dev/integration_tests/flutter_gallery/test/calculator/smoke_test.dart

@@ -8,8 +8,9 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
-  if (binding is LiveTestWidgetsFlutterBinding)
+  if (binding is LiveTestWidgetsFlutterBinding) {
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+  }
 
   // We press the "1" and the "2" buttons and check that the display
   // reads "12".

dev/integration_tests/flutter_gallery/test/drawer_test.dart

@@ -9,8 +9,9 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
-  if (binding is LiveTestWidgetsFlutterBinding)
+  if (binding is LiveTestWidgetsFlutterBinding) {
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+  }
 
   testWidgets('Flutter Gallery drawer item test', (WidgetTester tester) async {
     bool hasFeedback = false;

dev/integration_tests/flutter_gallery/test/example_code_display_test.dart

@@ -8,8 +8,9 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
-  if (binding is LiveTestWidgetsFlutterBinding)
+  if (binding is LiveTestWidgetsFlutterBinding) {
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+  }
 
   testWidgets('Flutter gallery button example code displays', (WidgetTester tester) async {
     // Regression test for https://github.com/flutter/flutter/issues/6147

dev/integration_tests/flutter_gallery/test/example_code_parser_test.dart

@@ -45,8 +45,9 @@ class TestAssetBundle extends AssetBundle {
 
   @override
   Future<String> loadString(String key, { bool cache = true }) async {
-    if (key == 'lib/gallery/example_code.dart')
+    if (key == 'lib/gallery/example_code.dart') {
       return testCodeFile;
+    }
     return '';
   }
 

dev/integration_tests/flutter_gallery/test/live_smoketest.dart

@@ -51,10 +51,12 @@ Future<void> main() async {
     // Verify that _kUnsynchronizedDemos and _kSkippedDemos identify
     // demos that actually exist.
     final List<String> allDemoTitles = kAllGalleryDemos.map((GalleryDemo demo) => demo.title).toList();
-    if (!Set<String>.from(allDemoTitles).containsAll(_kUnsynchronizedDemoTitles))
+    if (!Set<String>.from(allDemoTitles).containsAll(_kUnsynchronizedDemoTitles)) {
       fail('Unrecognized demo titles in _kUnsynchronizedDemosTitles: $_kUnsynchronizedDemoTitles');
-    if (!Set<String>.from(allDemoTitles).containsAll(_kSkippedDemoTitles))
+    }
+    if (!Set<String>.from(allDemoTitles).containsAll(_kSkippedDemoTitles)) {
       fail('Unrecognized demo names in _kSkippedDemoTitles: $_kSkippedDemoTitles');
+    }
 
     print('Starting app...');
     runApp(const GalleryApp(testMode: true));
@@ -66,8 +68,9 @@ Future<void> main() async {
         final Finder demoItem = find.text(demo.title);
         print('Scrolling to "${demo.title}"...');
         await controller.scrollIntoView(demoItem, alignment: 0.5);
-        if (_kSkippedDemoTitles.contains(demo.title))
+        if (_kSkippedDemoTitles.contains(demo.title)) {
           continue;
+        }
         for (int i = 0; i < 2; i += 1) {
           print('Tapping "${demo.title}"...');
           await controller.tap(demoItem); // Launch the demo
@@ -91,10 +94,12 @@ Future<void> main() async {
 final Finder backFinder = find.byElementPredicate(
   (Element element) {
     final Widget widget = element.widget;
-    if (widget is Tooltip)
+    if (widget is Tooltip) {
       return widget.message == 'Back';
-    if (widget is CupertinoNavigationBarBackButton)
+    }
+    if (widget is CupertinoNavigationBarBackButton) {
       return true;
+    }
     return false;
   },
   description: 'Material or Cupertino back button',
@@ -122,11 +127,13 @@ class _LiveWidgetController extends LiveWidgetController {
 
   /// Runs `finder` repeatedly until it finds one or more [Element]s.
   Future<Finder> _waitForElement(Finder finder) async {
-    if (frameSync)
+    if (frameSync) {
       await _waitUntilFrame(() => binding.transientCallbackCount == 0);
+    }
     await _waitUntilFrame(() => finder.precache());
-    if (frameSync)
+    if (frameSync) {
       await _waitUntilFrame(() => binding.transientCallbackCount == 0);
+    }
     return finder;
   }
 

dev/integration_tests/flutter_gallery/test/pesto_test.dart

@@ -8,8 +8,9 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
-  if (binding is LiveTestWidgetsFlutterBinding)
+  if (binding is LiveTestWidgetsFlutterBinding) {
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+  }
 
   // Regression test for https://github.com/flutter/flutter/pull/5168
   testWidgets('Pesto appbar heroics', (WidgetTester tester) async {

dev/integration_tests/flutter_gallery/test/simple_smoke_test.dart

@@ -8,8 +8,9 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
-  if (binding is LiveTestWidgetsFlutterBinding)
+  if (binding is LiveTestWidgetsFlutterBinding) {
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+  }
 
   testWidgets('Flutter Gallery app simple smoke test', (WidgetTester tester) async {
     await tester.pumpWidget(

dev/integration_tests/flutter_gallery/test/smoke_test.dart

@@ -40,8 +40,9 @@ void reportToStringError(String name, String route, int lineNumber, List<String>
 void verifyToStringOutput(String name, String route, String testString) {
   int lineNumber = 0;
   final List<String> lines = testString.split('\n');
-  if (!testString.endsWith('\n'))
+  if (!testString.endsWith('\n')) {
     reportToStringError(name, route, lines.length, lines, 'does not end with a line feed');
+  }
   for (final String line in lines) {
     lineNumber += 1;
     if (line == '' && lineNumber != lines.length) {

dev/integration_tests/flutter_gallery/test/update_test.dart

@@ -12,8 +12,9 @@ Future<String> mockUpdateUrlFetcher() {
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
-  if (binding is LiveTestWidgetsFlutterBinding)
+  if (binding is LiveTestWidgetsFlutterBinding) {
     binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
+  }
 
   // Regression test for https://github.com/flutter/flutter/pull/5168
   testWidgets('update dialog', (WidgetTester tester) async {

dev/integration_tests/flutter_gallery/test_driver/run_demos.dart

@@ -23,8 +23,9 @@ Future<void> runDemos(List<String> demos, WidgetController controller) async {
   String? currentDemoCategory;
 
   for (final String demo in demos) {
-    if (kSkippedDemos.contains(demo))
+    if (kSkippedDemos.contains(demo)) {
       continue;
+    }
 
     final String demoName = demo.substring(0, demo.indexOf('@'));
     final String demoCategory = demo.substring(demo.indexOf('@') + 1);

dev/integration_tests/flutter_gallery/test_driver/transitions_perf_test.dart

@@ -60,8 +60,9 @@ Future<void> saveDurationsHistogram(List<Map<String, dynamic>> events, String ou
   }
 
   // Verify that the durations data is valid.
-  if (durations.keys.isEmpty)
+  if (durations.keys.isEmpty) {
     throw 'no "Start Transition" timeline events found';
+  }
   final Map<String, int> unexpectedValueCounts = <String, int>{};
   durations.forEach((String routeName, List<int> values) {
     if (values.length != 2) {
@@ -83,8 +84,9 @@ Future<void> saveDurationsHistogram(List<Map<String, dynamic>> events, String ou
     while (eventIter.moveNext()) {
       final String eventName = eventIter.current['name'] as String;
 
-      if (!<String>['Start Transition', 'Frame'].contains(eventName))
+      if (!<String>['Start Transition', 'Frame'].contains(eventName)) {
         continue;
+      }
 
       final String routeName = eventName == 'Start Transition'
         ? (eventIter.current['args'] as Map<String, dynamic>)['to'] as String
@@ -114,8 +116,9 @@ Future<void> runDemos(List<String> demos, FlutterDriver driver) async {
   String? currentDemoCategory;
 
   for (final String demo in demos) {
-    if (kSkippedDemos.contains(demo))
+    if (kSkippedDemos.contains(demo)) {
       continue;
+    }
 
     final String demoName = demo.substring(0, demo.indexOf('@'));
     final String demoCategory = demo.substring(demo.indexOf('@') + 1);
@@ -176,8 +179,9 @@ void main([List<String> args = const <String>[]]) {
 
       // See _handleMessages() in transitions_perf.dart.
       _allDemos = List<String>.from(json.decode(await driver.requestData('demoNames')) as List<dynamic>);
-      if (_allDemos.isEmpty)
+      if (_allDemos.isEmpty) {
         throw 'no demo names found';
+      }
     });
 
     tearDownAll(() async {

dev/integration_tests/hybrid_android_views/lib/motion_event_diff.dart

@@ -46,17 +46,19 @@ void diffActions(StringBuffer diffBuffer, Map<String, dynamic> originalEvent,
   final String originalActionName =
       getActionName(originalActionMasked, originalEvent['action'] as int);
 
-  if (synthesizedActionMasked != originalActionMasked)
+  if (synthesizedActionMasked != originalActionMasked) {
     diffBuffer.write(
         'action (expected: $originalActionName actual: $synthesizedActionName) ');
+  }
 
   if (kPointerActions.contains(originalActionMasked) &&
       originalActionMasked == synthesizedActionMasked) {
     final int originalPointer = getPointerIdx(originalEvent['action'] as int);
     final int synthesizedPointer = getPointerIdx(synthesizedEvent['action'] as int);
-    if (originalPointer != synthesizedPointer)
+    if (originalPointer != synthesizedPointer) {
       diffBuffer.write(
           'pointerIdx (expected: $originalPointer actual: $synthesizedPointer action: $originalActionName ');
+    }
   }
 }
 
@@ -122,10 +124,12 @@ void diffMaps(
     return;
   }
   for (final String key in expected.keys) {
-    if (excludeKeys.contains(key))
+    if (excludeKeys.contains(key)) {
       continue;
-    if (doublesApproximatelyMatch(expected[key], actual[key]))
+    }
+    if (doublesApproximatelyMatch(expected[key], actual[key])) {
       continue;
+    }
 
     if (expected[key] != actual[key]) {
       diffBuffer.write(
@@ -154,10 +158,11 @@ String getActionName(int actionMasked, int action) {
     'BUTTON_PRESS',
     'BUTTON_RELEASE',
   ];
-  if (actionMasked < actionNames.length)
+  if (actionMasked < actionNames.length) {
     return '${actionNames[actionMasked]}($action)';
-  else
+  } else {
     return 'ACTION_$actionMasked';
+  }
 }
 
 bool doublesApproximatelyMatch(dynamic a, dynamic b) =>

dev/integration_tests/hybrid_android_views/lib/motion_events_page.dart

@@ -128,16 +128,19 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
 
       await viewChannel!.invokeMethod<void>('stopTouchEvents');
 
-      if (flutterViewEvents.length != embeddedViewEvents.length)
+      if (flutterViewEvents.length != embeddedViewEvents.length) {
         return 'Synthesized ${flutterViewEvents.length} events but the embedded view received ${embeddedViewEvents.length} events';
+      }
 
       final StringBuffer diff = StringBuffer();
       for (int i = 0; i < flutterViewEvents.length; ++i) {
         final String currentDiff = diffMotionEvents(flutterViewEvents[i], embeddedViewEvents[i]);
-        if (currentDiff.isEmpty)
+        if (currentDiff.isEmpty) {
           continue;
-        if (diff.isNotEmpty)
+        }
+        if (diff.isNotEmpty) {
           diff.write(', ');
+        }
         diff.write(currentDiff);
       }
       return diff.toString();
@@ -201,8 +204,9 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
       case 'onTouch':
         final Map<dynamic, dynamic> map = call.arguments as Map<dynamic, dynamic>;
         flutterViewEvents.insert(0, map.cast<String, dynamic>());
-        if (flutterViewEvents.length > kEventsBufferSize)
+        if (flutterViewEvents.length > kEventsBufferSize) {
           flutterViewEvents.removeLast();
+        }
         setState(() {});
         break;
     }
@@ -214,8 +218,9 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
       case 'onTouch':
         final Map<dynamic, dynamic> map = call.arguments as Map<dynamic, dynamic>;
         embeddedViewEvents.insert(0, map.cast<String, dynamic>());
-        if (embeddedViewEvents.length > kEventsBufferSize)
+        if (embeddedViewEvents.length > kEventsBufferSize) {
           embeddedViewEvents.removeLast();
+        }
         setState(() {});
         break;
     }
@@ -223,9 +228,10 @@ class MotionEventsBodyState extends State<MotionEventsBody> {
   }
 
   Widget buildEventTile(BuildContext context, int index) {
-    if (embeddedViewEvents.length > index)
+    if (embeddedViewEvents.length > index) {
       return TouchEventDiff(
           flutterViewEvents[index], embeddedViewEvents[index]);
+    }
     return Text(
         'Unmatched event, action: ${flutterViewEvents[index]['action']}');
   }

dev/integration_tests/platform_interaction/lib/main.dart

@@ -31,10 +31,11 @@ class _TestAppState extends State<TestApp> {
 
   void _executeNextStep() {
     setState(() {
-      if (_step < steps.length)
+      if (_step < steps.length) {
         _result = steps[_step++]();
-      else
+      } else {
         _result = Future<TestStepResult>.value(TestStepResult.complete);
+      }
     });
   }