Prefer void to null (#22977) * Future<void> main * Future<void>.delayed * prefer_void_to_Null * address review comments
diff --git a/examples/catalog/bin/screenshot_test.dart.template b/examples/catalog/bin/screenshot_test.dart.template index 6492439..63fb285 100644 --- a/examples/catalog/bin/screenshot_test.dart.template +++ b/examples/catalog/bin/screenshot_test.dart.template
@@ -26,7 +26,7 @@ for (String path in paths) { await driver.waitUntilNoTransientCallbacks(); // TBD: when #11021 has been resolved, this shouldn't be necessary. - await new Future<Null>.delayed(const Duration(milliseconds: 500)); + await new Future<void>.delayed(const Duration(milliseconds: 500)); final List<int> pixels = await driver.screenshot(); final File file = new File(path); await file.writeAsBytes(pixels);
diff --git a/examples/catalog/test/expansion_tile_sample_test.dart b/examples/catalog/test/expansion_tile_sample_test.dart index 2a6bcde..619a0ba 100644 --- a/examples/catalog/test/expansion_tile_sample_test.dart +++ b/examples/catalog/test/expansion_tile_sample_test.dart
@@ -22,12 +22,12 @@ } } - Future<Null> scrollUpOneEntry() async { + Future<void> scrollUpOneEntry() async { await tester.dragFrom(const Offset(200.0, 200.0), const Offset(0.0, -88.00)); await tester.pumpAndSettle(); } - Future<Null> tapEntry(String title) async { + Future<void> tapEntry(String title) async { await tester.tap(find.text(title)); await tester.pumpAndSettle(); }
diff --git a/examples/flutter_gallery/lib/demo/material/bottom_app_bar_demo.dart b/examples/flutter_gallery/lib/demo/material/bottom_app_bar_demo.dart index bf327f0..0b1a272 100644 --- a/examples/flutter_gallery/lib/demo/material/bottom_app_bar_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/bottom_app_bar_demo.dart
@@ -351,7 +351,7 @@ IconButton( icon: const Icon(Icons.menu), onPressed: () { - showModalBottomSheet<Null>( + showModalBottomSheet<void>( context: context, builder: (BuildContext context) => const _DemoDrawer(), );
diff --git a/examples/flutter_gallery/lib/demo/material/date_and_time_picker_demo.dart b/examples/flutter_gallery/lib/demo/material/date_and_time_picker_demo.dart index 64701fe..ab9763e 100644 --- a/examples/flutter_gallery/lib/demo/material/date_and_time_picker_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/date_and_time_picker_demo.dart
@@ -64,7 +64,7 @@ final ValueChanged<DateTime> selectDate; final ValueChanged<TimeOfDay> selectTime; - Future<Null> _selectDate(BuildContext context) async { + Future<void> _selectDate(BuildContext context) async { final DateTime picked = await showDatePicker( context: context, initialDate: selectedDate, @@ -75,7 +75,7 @@ selectDate(picked); } - Future<Null> _selectTime(BuildContext context) async { + Future<void> _selectTime(BuildContext context) async { final TimeOfDay picked = await showTimePicker( context: context, initialTime: selectedTime
diff --git a/examples/flutter_gallery/lib/demo/material/dialog_demo.dart b/examples/flutter_gallery/lib/demo/material/dialog_demo.dart index 27c7bff..73c5e83 100644 --- a/examples/flutter_gallery/lib/demo/material/dialog_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/dialog_demo.dart
@@ -180,7 +180,7 @@ context: context, initialTime: _selectedTime ) - .then<Null>((TimeOfDay value) { + .then<void>((TimeOfDay value) { if (value != null && value != _selectedTime) { _selectedTime = value; _scaffoldKey.currentState.showSnackBar(SnackBar(
diff --git a/examples/flutter_gallery/lib/demo/material/full_screen_dialog_demo.dart b/examples/flutter_gallery/lib/demo/material/full_screen_dialog_demo.dart index 9d268fe..9c5fc2c 100644 --- a/examples/flutter_gallery/lib/demo/material/full_screen_dialog_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/full_screen_dialog_demo.dart
@@ -49,7 +49,7 @@ firstDate: date.subtract(const Duration(days: 30)), lastDate: date.add(const Duration(days: 30)) ) - .then<Null>((DateTime value) { + .then<void>((DateTime value) { if (value != null) onChanged(DateTime(value.year, value.month, value.day, time.hour, time.minute)); }); @@ -76,7 +76,7 @@ context: context, initialTime: time ) - .then<Null>((TimeOfDay value) { + .then<void>((TimeOfDay value) { if (value != null) onChanged(DateTime(date.year, date.month, date.day, value.hour, value.minute)); });
diff --git a/examples/flutter_gallery/lib/demo/material/list_demo.dart b/examples/flutter_gallery/lib/demo/material/list_demo.dart index 0f35f96..d47c226 100644 --- a/examples/flutter_gallery/lib/demo/material/list_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/list_demo.dart
@@ -32,7 +32,7 @@ class _ListDemoState extends State<ListDemo> { static final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>(); - PersistentBottomSheetController<Null> _bottomSheet; + PersistentBottomSheetController<void> _bottomSheet; _MaterialListType _itemType = _MaterialListType.threeLine; bool _dense = false; bool _showAvatars = true; @@ -51,7 +51,7 @@ } void _showConfigurationSheet() { - final PersistentBottomSheetController<Null> bottomSheet = scaffoldKey.currentState.showBottomSheet((BuildContext bottomSheetContext) { + final PersistentBottomSheetController<void> bottomSheet = scaffoldKey.currentState.showBottomSheet<void>((BuildContext bottomSheetContext) { return Container( decoration: const BoxDecoration( border: Border(top: BorderSide(color: Colors.black26)),
diff --git a/examples/flutter_gallery/lib/demo/material/overscroll_demo.dart b/examples/flutter_gallery/lib/demo/material/overscroll_demo.dart index 5863444..028b1fc 100644 --- a/examples/flutter_gallery/lib/demo/material/overscroll_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/overscroll_demo.dart
@@ -26,10 +26,10 @@ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N' ]; - Future<Null> _handleRefresh() { - final Completer<Null> completer = Completer<Null>(); - Timer(const Duration(seconds: 3), () { completer.complete(null); }); - return completer.future.then<Null>((_) { + Future<void> _handleRefresh() { + final Completer<void> completer = Completer<void>(); + Timer(const Duration(seconds: 3), () { completer.complete(); }); + return completer.future.then<void>((_) { _scaffoldKey.currentState?.showSnackBar(SnackBar( content: const Text('Refresh complete'), action: SnackBarAction(
diff --git a/examples/flutter_gallery/lib/demo/material/persistent_bottom_sheet_demo.dart b/examples/flutter_gallery/lib/demo/material/persistent_bottom_sheet_demo.dart index b244989..40ac589 100644 --- a/examples/flutter_gallery/lib/demo/material/persistent_bottom_sheet_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/persistent_bottom_sheet_demo.dart
@@ -28,7 +28,7 @@ setState(() { // disable the button _showBottomSheetCallback = null; }); - _scaffoldKey.currentState.showBottomSheet<Null>((BuildContext context) { + _scaffoldKey.currentState.showBottomSheet<void>((BuildContext context) { final ThemeData themeData = Theme.of(context); return Container( decoration: BoxDecoration(
diff --git a/examples/flutter_gallery/lib/demo/material/reorderable_list_demo.dart b/examples/flutter_gallery/lib/demo/material/reorderable_list_demo.dart index 4cda720..f296128 100644 --- a/examples/flutter_gallery/lib/demo/material/reorderable_list_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/reorderable_list_demo.dart
@@ -39,7 +39,7 @@ class _ListDemoState extends State<ReorderableListDemo> { static final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>(); - PersistentBottomSheetController<Null> _bottomSheet; + PersistentBottomSheetController<void> _bottomSheet; _ReorderableListType _itemType = _ReorderableListType.threeLine; bool _reverseSort = false; final List<_ListItem> _items = <String>[ @@ -58,7 +58,7 @@ void _showConfigurationSheet() { setState(() { - _bottomSheet = scaffoldKey.currentState.showBottomSheet((BuildContext bottomSheetContext) { + _bottomSheet = scaffoldKey.currentState.showBottomSheet<void>((BuildContext bottomSheetContext) { return DecoratedBox( decoration: const BoxDecoration( border: Border(top: BorderSide(color: Colors.black26)),
diff --git a/examples/flutter_gallery/lib/demo/material/tabs_fab_demo.dart b/examples/flutter_gallery/lib/demo/material/tabs_fab_demo.dart index 0ebb592..6f09cb8 100644 --- a/examples/flutter_gallery/lib/demo/material/tabs_fab_demo.dart +++ b/examples/flutter_gallery/lib/demo/material/tabs_fab_demo.dart
@@ -69,7 +69,7 @@ } void _showExplanatoryText() { - _scaffoldKey.currentState.showBottomSheet<Null>((BuildContext context) { + _scaffoldKey.currentState.showBottomSheet<void>((BuildContext context) { return Container( decoration: BoxDecoration( border: Border(top: BorderSide(color: Theme.of(context).dividerColor))
diff --git a/examples/flutter_gallery/lib/demo/shrine/shrine_home.dart b/examples/flutter_gallery/lib/demo/shrine/shrine_home.dart index 9382df9..a7aa943 100644 --- a/examples/flutter_gallery/lib/demo/shrine/shrine_home.dart +++ b/examples/flutter_gallery/lib/demo/shrine/shrine_home.dart
@@ -362,7 +362,7 @@ static final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>(debugLabel: 'Shrine Home'); static final _ShrineGridDelegate gridDelegate = _ShrineGridDelegate(); - Future<Null> _showOrderPage(Product product) async { + Future<void> _showOrderPage(Product product) async { final Order order = _shoppingCart[product] ?? Order(product: product); final Order completedOrder = await Navigator.push(context, ShrineOrderRoute( order: order,
diff --git a/examples/flutter_gallery/lib/demo/video_demo.dart b/examples/flutter_gallery/lib/demo/video_demo.dart index a100591..b4851bd 100644 --- a/examples/flutter_gallery/lib/demo/video_demo.dart +++ b/examples/flutter_gallery/lib/demo/video_demo.dart
@@ -66,7 +66,7 @@ pageBuilder: fullScreenRoutePageBuilder, ); - route.completed.then((void result) { + route.completed.then((void value) { controller.setVolume(0.0); }); @@ -272,7 +272,7 @@ }); final Widget child; - final Completer<Null> connectedCompleter; + final Completer<void> connectedCompleter; final GlobalKey<ScaffoldState> scaffoldKey; @override @@ -362,14 +362,14 @@ ); final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>(); - final Completer<Null> connectedCompleter = Completer<Null>(); + final Completer<void> connectedCompleter = Completer<void>(); bool isSupported = true; @override void initState() { super.initState(); - Future<Null> initController(VideoPlayerController controller) async { + Future<void> initController(VideoPlayerController controller) async { controller.setLooping(true); controller.setVolume(0.0); controller.play();
diff --git a/examples/flutter_gallery/lib/gallery/demo.dart b/examples/flutter_gallery/lib/gallery/demo.dart index c6a5eda..12afd7d 100644 --- a/examples/flutter_gallery/lib/gallery/demo.dart +++ b/examples/flutter_gallery/lib/gallery/demo.dart
@@ -138,7 +138,7 @@ @override void didChangeDependencies() { - getExampleCode(widget.exampleCodeTag, DefaultAssetBundle.of(context)).then<Null>((String code) { + getExampleCode(widget.exampleCodeTag, DefaultAssetBundle.of(context)).then<void>((String code) { if (mounted) { setState(() { _exampleCode = code ?? 'Example code not found';
diff --git a/examples/flutter_gallery/lib/gallery/example_code_parser.dart b/examples/flutter_gallery/lib/gallery/example_code_parser.dart index 6a834bc..7f50292 100644 --- a/examples/flutter_gallery/lib/gallery/example_code_parser.dart +++ b/examples/flutter_gallery/lib/gallery/example_code_parser.dart
@@ -17,7 +17,7 @@ return _exampleCode[tag]; } -Future<Null> _parseExampleCode(AssetBundle bundle) async { +Future<void> _parseExampleCode(AssetBundle bundle) async { final String code = await bundle.loadString('lib/gallery/example_code.dart') ?? '// lib/gallery/example_code.dart not found\n'; _exampleCode = <String, String>{};
diff --git a/examples/flutter_gallery/test/live_smoketest.dart b/examples/flutter_gallery/test/live_smoketest.dart index 8bab93d..c64be04 100644 --- a/examples/flutter_gallery/test/live_smoketest.dart +++ b/examples/flutter_gallery/test/live_smoketest.dart
@@ -39,7 +39,7 @@ 'Video', ]; -Future<Null> main() async { +Future<void> main() async { try { // Verify that _kUnsynchronizedDemos and _kSkippedDemos identify // demos that actually exist. @@ -89,8 +89,8 @@ bool frameSync = true; /// Waits until at the end of a frame the provided [condition] is [true]. - Future<Null> _waitUntilFrame(bool condition(), [Completer<Null> completer]) { - completer ??= Completer<Null>(); + Future<void> _waitUntilFrame(bool condition(), [Completer<void> completer]) { + completer ??= Completer<void>(); if (!condition()) { SchedulerBinding.instance.addPostFrameCallback((Duration timestamp) { _waitUntilFrame(condition, completer); @@ -112,11 +112,11 @@ } @override - Future<Null> tap(Finder finder, { int pointer }) async { + Future<void> tap(Finder finder, { int pointer }) async { await super.tap(await _waitForElement(finder), pointer: pointer); } - Future<Null> scrollIntoView(Finder finder, {double alignment}) async { + Future<void> scrollIntoView(Finder finder, {double alignment}) async { final Finder target = await _waitForElement(finder); await Scrollable.ensureVisible(target.evaluate().single, duration: const Duration(milliseconds: 100), alignment: alignment); }
diff --git a/examples/flutter_gallery/test/smoke_test.dart b/examples/flutter_gallery/test/smoke_test.dart index df480fc..9eb65f5 100644 --- a/examples/flutter_gallery/test/smoke_test.dart +++ b/examples/flutter_gallery/test/smoke_test.dart
@@ -46,7 +46,7 @@ } } -Future<Null> smokeDemo(WidgetTester tester, GalleryDemo demo) async { +Future<void> smokeDemo(WidgetTester tester, GalleryDemo demo) async { // Don't use pumpUntilNoTransientCallbacks in this function, because some of // the smoketests have infinitely-running animations (e.g. the progress // indicators demo). @@ -94,7 +94,7 @@ await tester.pump(const Duration(milliseconds: 400)); // Wait until it has finished. } -Future<Null> smokeOptionsPage(WidgetTester tester) async { +Future<void> smokeOptionsPage(WidgetTester tester) async { final Finder showOptionsPageButton = find.byTooltip('Toggle options page'); // Show the options page @@ -133,7 +133,7 @@ await tester.pumpAndSettle(); } -Future<Null> smokeGallery(WidgetTester tester) async { +Future<void> smokeGallery(WidgetTester tester) async { bool sendFeedbackButtonPressed = false; await tester.pumpWidget(
diff --git a/examples/flutter_gallery/test_driver/scroll_perf_test.dart b/examples/flutter_gallery/test_driver/scroll_perf_test.dart index 07a0b7f..0f1f2cb 100644 --- a/examples/flutter_gallery/test_driver/scroll_perf_test.dart +++ b/examples/flutter_gallery/test_driver/scroll_perf_test.dart
@@ -31,13 +31,13 @@ // Scroll down for (int i = 0; i < 5; i++) { await driver.scroll(demoList, 0.0, -300.0, const Duration(milliseconds: 300)); - await Future<Null>.delayed(const Duration(milliseconds: 500)); + await Future<void>.delayed(const Duration(milliseconds: 500)); } // Scroll up for (int i = 0; i < 5; i++) { await driver.scroll(demoList, 0.0, 300.0, const Duration(milliseconds: 300)); - await Future<Null>.delayed(const Duration(milliseconds: 500)); + await Future<void>.delayed(const Duration(milliseconds: 500)); } });
diff --git a/examples/flutter_gallery/test_driver/transitions_perf_test.dart b/examples/flutter_gallery/test_driver/transitions_perf_test.dart index 9e6da3b..440e332 100644 --- a/examples/flutter_gallery/test_driver/transitions_perf_test.dart +++ b/examples/flutter_gallery/test_driver/transitions_perf_test.dart
@@ -55,7 +55,7 @@ /// Extracts event data from [events] recorded by timeline, validates it, turns /// it into a histogram, and saves to a JSON file. -Future<Null> saveDurationsHistogram(List<Map<String, dynamic>> events, String outputPath) async { +Future<void> saveDurationsHistogram(List<Map<String, dynamic>> events, String outputPath) async { final Map<String, List<int>> durations = <String, List<int>>{}; Map<String, dynamic> startEvent; @@ -121,7 +121,7 @@ /// Scrolls each demo menu item into view, launches it, then returns to the /// home screen twice. -Future<Null> runDemos(List<String> demos, FlutterDriver driver) async { +Future<void> runDemos(List<String> demos, FlutterDriver driver) async { final SerializableFinder demoList = find.byValueKey('GalleryDemoList'); String currentDemoCategory;
diff --git a/examples/flutter_gallery/test_memory/back_button.dart b/examples/flutter_gallery/test_memory/back_button.dart index c8f2e11..9efc776 100644 --- a/examples/flutter_gallery/test_memory/back_button.dart +++ b/examples/flutter_gallery/test_memory/back_button.dart
@@ -30,7 +30,7 @@ Future<void> main() async { runApp(const GalleryApp()); await endOfAnimation(); - await Future<Null>.delayed(const Duration(milliseconds: 50)); + await Future<void>.delayed(const Duration(milliseconds: 50)); debugPrint('==== MEMORY BENCHMARK ==== READY ===='); WidgetsBinding.instance.addObserver(LifecycleObserver()); }
diff --git a/examples/flutter_gallery/test_memory/memory_nav.dart b/examples/flutter_gallery/test_memory/memory_nav.dart index fc64fda..b5aad66 100644 --- a/examples/flutter_gallery/test_memory/memory_nav.dart +++ b/examples/flutter_gallery/test_memory/memory_nav.dart
@@ -36,7 +36,7 @@ ), )); await SchedulerBinding.instance.endOfFrame; - await Future<Null>.delayed(const Duration(milliseconds: 50)); + await Future<void>.delayed(const Duration(milliseconds: 50)); debugPrint('==== MEMORY BENCHMARK ==== READY ===='); await ready.future; @@ -55,12 +55,12 @@ debugPrint('Navigating...'); await controller.tap(find.text('Material')); - await Future<Null>.delayed(const Duration(milliseconds: 150)); + await Future<void>.delayed(const Duration(milliseconds: 150)); final Finder demoList = find.byKey(const Key('GalleryDemoList')); final Finder demoItem = find.text('Text fields'); do { await controller.drag(demoList, const Offset(0.0, -300.0)); - await Future<Null>.delayed(const Duration(milliseconds: 20)); + await Future<void>.delayed(const Duration(milliseconds: 20)); } while (!demoItem.precache()); // Ensure that the center of the "Text fields" item is visible
diff --git a/examples/layers/services/isolate.dart b/examples/layers/services/isolate.dart index d7bfae7..5c689d6 100644 --- a/examples/layers/services/isolate.dart +++ b/examples/layers/services/isolate.dart
@@ -136,12 +136,12 @@ // isolates do not have access to the root bundle. However, the loading // process is asynchronous, so the UI will not block while the file is // loaded. - rootBundle.loadString('services/data.json').then<Null>((String data) { + rootBundle.loadString('services/data.json').then<void>((String data) { if (isRunning) { final CalculationMessage message = CalculationMessage(data, _receivePort.sendPort); // Spawn an isolate to JSON-parse the file contents. The JSON parsing // is synchronous, so if done in the main isolate, the UI would block. - Isolate.spawn<CalculationMessage>(_calculate, message).then<Null>((Isolate isolate) { + Isolate.spawn<CalculationMessage>(_calculate, message).then<void>((Isolate isolate) { if (!isRunning) { isolate.kill(priority: Isolate.immediate); } else {
diff --git a/examples/layers/test/gestures_test.dart b/examples/layers/test/gestures_test.dart index c37b1d2..1b09663 100644 --- a/examples/layers/test/gestures_test.dart +++ b/examples/layers/test/gestures_test.dart
@@ -16,7 +16,7 @@ final Finder finder = find.byType(GestureDemo); MaterialColor getSwatch() => tester.state<GestureDemoState>(finder).swatch; - Future<Null> tap() async { + Future<void> tap() async { final Offset topLeft = tester.getTopLeft(finder); await tester.tapAt(tester.getSize(finder).center(topLeft)); await tester.pump(const Duration(seconds: 1));
diff --git a/examples/platform_channel/lib/main.dart b/examples/platform_channel/lib/main.dart index 8739a01..48eddc8 100644 --- a/examples/platform_channel/lib/main.dart +++ b/examples/platform_channel/lib/main.dart
@@ -21,7 +21,7 @@ String _batteryLevel = 'Battery level: unknown.'; String _chargingStatus = 'Battery status: unknown.'; - Future<Null> _getBatteryLevel() async { + Future<void> _getBatteryLevel() async { String batteryLevel; try { final int result = await methodChannel.invokeMethod('getBatteryLevel');
diff --git a/examples/platform_channel_swift/lib/main.dart b/examples/platform_channel_swift/lib/main.dart index 8739a01..48eddc8 100644 --- a/examples/platform_channel_swift/lib/main.dart +++ b/examples/platform_channel_swift/lib/main.dart
@@ -21,7 +21,7 @@ String _batteryLevel = 'Battery level: unknown.'; String _chargingStatus = 'Battery status: unknown.'; - Future<Null> _getBatteryLevel() async { + Future<void> _getBatteryLevel() async { String batteryLevel; try { final int result = await methodChannel.invokeMethod('getBatteryLevel');
diff --git a/examples/platform_view/lib/main.dart b/examples/platform_view/lib/main.dart index 9a66c01..4778d68 100644 --- a/examples/platform_view/lib/main.dart +++ b/examples/platform_view/lib/main.dart
@@ -45,7 +45,7 @@ }); } - Future<Null> _launchPlatformCount() async { + Future<void> _launchPlatformCount() async { final int platformCounter = await _methodChannel.invokeMethod('switchView', _counter); setState(() {
diff --git a/examples/stocks/lib/stock_data.dart b/examples/stocks/lib/stock_data.dart index e8d98db..3e08482 100644 --- a/examples/stocks/lib/stock_data.dart +++ b/examples/stocks/lib/stock_data.dart
@@ -77,7 +77,7 @@ static bool actuallyFetchData = true; void _fetchNextChunk() { - _httpClient.get(_urlToFetch(_nextChunk++)).then<Null>((http.Response response) { + _httpClient.get(_urlToFetch(_nextChunk++)).then<void>((http.Response response) { final String json = response.body; if (json == null) { debugPrint('Failed to load stock data chunk ${_nextChunk - 1}');
diff --git a/examples/stocks/lib/stock_home.dart b/examples/stocks/lib/stock_home.dart index 323850d..c77134e 100644 --- a/examples/stocks/lib/stock_home.dart +++ b/examples/stocks/lib/stock_home.dart
@@ -263,7 +263,7 @@ Navigator.pushNamed(context, '/stock:${stock.symbol}'); }, onShow: (Stock stock) { - _scaffoldKey.currentState.showBottomSheet<Null>((BuildContext context) => StockSymbolBottomSheet(stock: stock)); + _scaffoldKey.currentState.showBottomSheet<void>((BuildContext context) => StockSymbolBottomSheet(stock: stock)); }, ); }
diff --git a/examples/stocks/test_driver/scroll_perf_test.dart b/examples/stocks/test_driver/scroll_perf_test.dart index e8a8591..eb5a23c 100644 --- a/examples/stocks/test_driver/scroll_perf_test.dart +++ b/examples/stocks/test_driver/scroll_perf_test.dart
@@ -29,13 +29,13 @@ // Scroll down for (int i = 0; i < 5; i++) { await driver.scroll(stockList, 0.0, -300.0, const Duration(milliseconds: 300)); - await Future<Null>.delayed(const Duration(milliseconds: 500)); + await Future<void>.delayed(const Duration(milliseconds: 500)); } // Scroll up for (int i = 0; i < 5; i++) { await driver.scroll(stockList, 0.0, 300.0, const Duration(milliseconds: 300)); - await Future<Null>.delayed(const Duration(milliseconds: 500)); + await Future<void>.delayed(const Duration(milliseconds: 500)); } });