Even more types

packages/flutter/lib/src/widgets/scrollable.dart

@@ -500,10 +500,11 @@ abstract class ScrollableState<T extends Scrollable> extends State<T> {
     return fling(scrollVelocity.clamp(-kMaxFlingVelocity, kMaxFlingVelocity)).then(_endScroll);
   }
 
-  void _endScroll([_]) {
+  Null _endScroll([Null _]) {
     _numberOfInProgressScrolls -= 1;
     if (_numberOfInProgressScrolls == 0)
       dispatchOnScrollEnd();
+    return null;
   }
 
   /// Calls the dispatchOnScrollEnd callback.

packages/flutter_driver/lib/src/driver.dart

@@ -64,7 +64,7 @@ class FlutterDriver {
     // Attempts to resume the isolate, but does not crash if it fails because
     // the isolate is already resumed. There could be a race with other tools,
     // such as a debugger, any of which could have resumed the isolate.
-    Future<Null> resumeLeniently() {
+    Future<dynamic> resumeLeniently() {
       _log.trace('Attempting to resume isolate');
       return isolate.resume().catchError((dynamic e) {
         const int vmMustBePausedCode = 101;
@@ -87,7 +87,7 @@ class FlutterDriver {
       _log.trace('Isolate is paused at start.');
 
       // Waits for a signal from the VM service that the extension is registered
-      Future<Null> waitForServiceExtension() {
+      Future<String> waitForServiceExtension() {
         return isolate.onExtensionAdded.firstWhere((String extension) {
           return extension == _kFlutterExtensionMethod;
         });
@@ -96,8 +96,8 @@ class FlutterDriver {
       // If the isolate is paused at the start, e.g. via the --start-paused
       // option, then the VM service extension is not registered yet. Wait for
       // it to be registered.
-      Future<Null> whenResumed = resumeLeniently();
-      Future<Null> whenServiceExtensionReady = Future.any(<Future<dynamic>>[
+      Future<dynamic> whenResumed = resumeLeniently();
+      Future<dynamic> whenServiceExtensionReady = Future.any/*dynamic*/(<Future<dynamic>>[
         waitForServiceExtension(),
         // We will never receive the extension event if the user does not
         // register it. If that happens time out.
@@ -180,7 +180,7 @@ class FlutterDriver {
   }
 
   Future<Null> tap(ObjectRef ref) async {
-    return await _sendCommand(new Tap(ref)).then((_) => null);
+    return await _sendCommand(new Tap(ref)).then((Map<String, dynamic> _) => null);
   }
 
   /// Tell the driver to perform a scrolling action.
@@ -197,7 +197,7 @@ class FlutterDriver {
   /// The move events are generated at a given [frequency] in Hz (or events per
   /// second). It defaults to 60Hz.
   Future<Null> scroll(ObjectRef ref, double dx, double dy, Duration duration, {int frequency: 60}) async {
-    return await _sendCommand(new Scroll(ref, dx, dy, duration, frequency)).then((_) => null);
+    return await _sendCommand(new Scroll(ref, dx, dy, duration, frequency)).then((Map<String, dynamic> _) => null);
   }
 
   Future<String> getText(ObjectRef ref) async {

packages/flutter_driver/test/flutter_driver_test.dart

@@ -16,13 +16,13 @@ import 'package:vm_service_client/vm_service_client.dart';
 void main() {
   group('FlutterDriver.connect', () {
     List<LogRecord> log;
-    StreamSubscription logSub;
+    StreamSubscription<LogRecord> logSub;
     MockVMServiceClient mockClient;
     MockVM mockVM;
     MockIsolate mockIsolate;
 
     void expectLogContains(String message) {
-      expect(log.map((r) => '$r'), anyElement(contains(message)));
+      expect(log.map((LogRecord r) => '$r'), anyElement(contains(message)));
     }
 
     setUp(() {
@@ -35,8 +35,8 @@ void main() {
       when(mockVM.isolates).thenReturn([mockIsolate]);
       when(mockIsolate.loadRunnable()).thenReturn(mockIsolate);
       when(mockIsolate.invokeExtension(any, any))
-          .thenReturn(new Future.value({'status': 'ok'}));
-      vmServiceConnectFunction = (_) => new Future.value(mockClient);
+          .thenReturn(new Future<Map<String, dynamic>>.value(<String, String>{'status': 'ok'}));
+      vmServiceConnectFunction = (String url) => new Future<VMServiceClient>.value(mockClient);
     });
 
     tearDown(() async {
@@ -46,9 +46,8 @@ void main() {
 
     test('connects to isolate paused at start', () async {
       when(mockIsolate.pauseEvent).thenReturn(new MockVMPauseStartEvent());
-      when(mockIsolate.resume()).thenReturn(new Future.value());
-      when(mockIsolate.onExtensionAdded)
-          .thenReturn(new Stream.fromIterable(['ext.flutter_driver']));
+      when(mockIsolate.resume()).thenReturn(new Future<Null>.value());
+      when(mockIsolate.onExtensionAdded).thenReturn(new Stream<String>.fromIterable(<String>['ext.flutter_driver']));
 
       FlutterDriver driver = await FlutterDriver.connect();
       expect(driver, isNotNull);
@@ -57,7 +56,7 @@ void main() {
 
     test('connects to isolate paused mid-flight', () async {
       when(mockIsolate.pauseEvent).thenReturn(new MockVMPauseBreakpointEvent());
-      when(mockIsolate.resume()).thenReturn(new Future.value());
+      when(mockIsolate.resume()).thenReturn(new Future<Null>.value());
 
       FlutterDriver driver = await FlutterDriver.connect();
       expect(driver, isNotNull);
@@ -73,7 +72,7 @@ void main() {
       when(mockIsolate.resume()).thenAnswer((_) {
         // This needs to be wrapped in a closure to not be considered uncaught
         // by package:test
-        return new Future.error(new rpc.RpcException(101, ''));
+        return new Future<Null>.error(new rpc.RpcException(101, ''));
       });
 
       FlutterDriver driver = await FlutterDriver.connect();
@@ -101,7 +100,7 @@ void main() {
     });
 
     test('checks the health of the driver extension', () async {
-      when(mockIsolate.invokeExtension(any, any)).thenReturn(new Future.value({
+      when(mockIsolate.invokeExtension(any, any)).thenReturn(new Future<Map<String, dynamic>>.value(<String, dynamic>{
         'status': 'ok',
       }));
       Health result = await driver.checkHealth();
@@ -109,7 +108,7 @@ void main() {
     });
 
     test('closes connection', () async {
-      when(mockClient.close()).thenReturn(new Future.value());
+      when(mockClient.close()).thenReturn(new Future<Null>.value());
       await driver.close();
     });
 
@@ -127,7 +126,7 @@ void main() {
             'keyValueString': 'foo',
             'keyValueType': 'String'
           });
-          return new Future.value({
+          return new Future<Map<String, dynamic>>.value(<String, dynamic>{
             'objectReferenceKey': '123',
           });
         });
@@ -149,11 +148,11 @@ void main() {
 
       test('sends the tap command', () async {
         when(mockIsolate.invokeExtension(any, any)).thenAnswer((Invocation i) {
-          expect(i.positionalArguments[1], {
+          expect(i.positionalArguments[1], <String, dynamic>{
             'command': 'tap',
             'targetRef': '123'
           });
-          return new Future.value();
+          return new Future<Map<String, dynamic>>.value();
         });
         await driver.tap(new ObjectRef('123'));
       });
@@ -171,11 +170,11 @@ void main() {
 
       test('sends the getText command', () async {
         when(mockIsolate.invokeExtension(any, any)).thenAnswer((Invocation i) {
-          expect(i.positionalArguments[1], {
+          expect(i.positionalArguments[1], <String, dynamic>{
             'command': 'get_text',
             'targetRef': '123'
           });
-          return new Future.value({
+          return new Future<Map<String, dynamic>>.value({
             'text': 'hello'
           });
         });
@@ -188,7 +187,7 @@ void main() {
       test('waits for a condition', () {
         expect(
           driver.waitFor(() {
-            return new Future.delayed(
+            return new Future<int>.delayed(
               new Duration(milliseconds: 50),
               () => 123
             );
@@ -228,7 +227,7 @@ void main() {
           equals(2),
           timeout: new Duration(milliseconds: 10),
           pauseBetweenRetries: new Duration(milliseconds: 2)
-        ).catchError((err, stack) {
+        ).catchError((dynamic err, dynamic stack) {
           timedOut = true;
         });
 

packages/flutter_driver/test/retry_test.dart

@@ -62,7 +62,7 @@ void main() {
             () async => retryCount++,
             new Duration(milliseconds: 30),
             new Duration(milliseconds: 10),
-            predicate: (value) => value == 2
+            predicate: (int value) => value == 2
           ),
           completion(2)
         );
@@ -85,7 +85,7 @@ void main() {
           },
           new Duration(milliseconds: 7),
           new Duration(milliseconds: 2)
-        ).catchError((error, stackTrace) {
+        ).catchError((dynamic error, dynamic stackTrace) {
           timedOut = true;
           lastError = error;
           lastStackTrace = stackTrace;

packages/flutter_tools/.analysis_options

@@ -16,14 +16,13 @@ analyzer:
     strong_mode_static_type_error: ignore
     strong_mode_down_cast_composite: ignore
     type_argument_not_matching_bounds: ignore
-    argument_type_not_assignable: ignore
     # we allow having TODOs in the code
     todo: ignore
 linter:
   rules:
     - avoid_empty_else
     - always_declare_return_types
-    # - always_specify_types # still a lot of work to do before enabling this one
+    - always_specify_types
     # - annotate_overrides # still a lot of work to do before enabling this one
     # - avoid_as # https://github.com/dart-lang/linter/issues/195
     - avoid_init_to_null

packages/flutter_tools/lib/flutter_tools.dart

@@ -10,17 +10,17 @@ import 'src/flx.dart' as flx;
 /// Assembles a Flutter .flx file from a pre-existing manifest descriptor and a
 /// pre-compiled snapshot.
 Future<int> assembleFlx({
-  Map manifestDescriptor: const {},
+  Map<String, dynamic> manifestDescriptor: const <String, dynamic>{},
   File snapshotFile: null,
   String assetBasePath: flx.defaultAssetBasePath,
   String outputPath: flx.defaultFlxOutputPath,
   String privateKeyPath: flx.defaultPrivateKeyPath
 }) async {
   return flx.assemble(
-      manifestDescriptor: manifestDescriptor,
-      snapshotFile: snapshotFile,
-      assetBasePath: assetBasePath,
-      outputPath: outputPath,
-      privateKeyPath: privateKeyPath
+    manifestDescriptor: manifestDescriptor,
+    snapshotFile: snapshotFile,
+    assetBasePath: assetBasePath,
+    outputPath: outputPath,
+    privateKeyPath: privateKeyPath
   );
 }

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

@@ -82,7 +82,7 @@ class Adb {
     Socket socket;
     bool isFirstNotification = true;
 
-    controller = new StreamController(
+    controller = new StreamController<List<AdbDevice>>(
       onListen: () async {
         socket = await Socket.connect(InternetAddress.LOOPBACK_IP_V4, adbServerPort);
         printTrace('--> host:track-devices');
@@ -121,7 +121,7 @@ class Adb {
     return controller.stream;
   }
 
-  Future _populateDeviceNames(List<AdbDevice> devices) async {
+  Future<Null> _populateDeviceNames(List<AdbDevice> devices) async {
     for (AdbDevice device in devices) {
       if (device.modelID == null) {
         // If we don't have a name of a device in our cache, call `device -l` to populate it.
@@ -135,7 +135,7 @@ class Adb {
     }
   }
 
-  Future _populateDeviceCache() async {
+  Future<Null> _populateDeviceCache() async {
     List<AdbDevice> devices = await listDevices();
     for (AdbDevice device in devices)
       _idToNameCache[device.id] = device.modelID;

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

@@ -180,7 +180,7 @@ class AndroidDevice extends Device {
     return true;
   }
 
-  Future _forwardObservatoryPort(int port) async {
+  Future<Null> _forwardObservatoryPort(int port) async {
     bool portWasZero = port == 0;
 
     try {
@@ -485,8 +485,8 @@ class _AdbLogReader extends DeviceLogReader {
       new StreamController<String>.broadcast();
 
   Process _process;
-  StreamSubscription _stdoutSubscription;
-  StreamSubscription _stderrSubscription;
+  StreamSubscription<String> _stdoutSubscription;
+  StreamSubscription<String> _stderrSubscription;
 
   Stream<String> get lines => _linesStreamController.stream;
 
@@ -494,9 +494,9 @@ class _AdbLogReader extends DeviceLogReader {
 
   bool get isReading => _process != null;
 
-  Future get finished => _process != null ? _process.exitCode : new Future.value(0);
+  Future<int> get finished => _process != null ? _process.exitCode : new Future<int>.value(0);
 
-  Future start() async {
+  Future<Null> start() async {
     if (_process != null)
       throw new StateError('_AdbLogReader must be stopped before it can be started.');
 
@@ -516,7 +516,7 @@ class _AdbLogReader extends DeviceLogReader {
     _process.exitCode.then(_onExit);
   }
 
-  Future stop() async {
+  Future<Null> stop() async {
     if (_process == null)
       throw new StateError('_AdbLogReader must be started before it can be stopped.');
 
@@ -604,7 +604,7 @@ class _AndroidDevicePortForwarder extends DevicePortForwarder {
     return hostPort;
   }
 
-  Future unforward(ForwardedPort forwardedPort) async {
+  Future<Null> unforward(ForwardedPort forwardedPort) async {
     runCheckedSync(device.adbCommandForDevice(
       <String>['forward', '--remove', 'tcp:${forwardedPort.hostPort}']
     ));

packages/flutter_tools/lib/src/artifacts.dart

@@ -235,7 +235,7 @@ class ArtifactStore {
   /// Download a file from the given url and write it to the cache.
   /// If [unzip] is true, treat the url as a zip file, and unzip it to the
   /// directory given.
-  static Future _downloadFileToCache(Uri url, FileSystemEntity cachedFile, bool unzip) async {
+  static Future<Null> _downloadFileToCache(Uri url, FileSystemEntity cachedFile, bool unzip) async {
     if (!cachedFile.parent.existsSync())
       cachedFile.parent.createSync(recursive: true);
 

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

@@ -46,7 +46,7 @@ void restoreFileSystem() {
 }
 
 /// Uses in-memory replacments for `dart:io` functionality. Useful in tests.
-void useInMemoryFileSystem({ cwd: '/', ExitFunction exitFunction }) {
+void useInMemoryFileSystem({ String cwd: '/', ExitFunction exitFunction }) {
   MemoryFileSystem memFs = new MemoryFileSystem();
   fs = memFs;
   syncFs = new SyncMemoryFileSystem(backedBy: memFs.storage);

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

@@ -4,7 +4,7 @@
 
 import 'dart:io';
 
-final _terminal = new _AnsiTerminal();
+final _AnsiTerminal _terminal = new _AnsiTerminal();
 
 abstract class Logger {
   bool get isVerbose => false;

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

@@ -57,9 +57,9 @@ Future<int> runCommandAndStreamOutput(List<String> cmd, {
   return await process.exitCode;
 }
 
-Future runAndKill(List<String> cmd, Duration timeout) {
+Future<Null> runAndKill(List<String> cmd, Duration timeout) {
   Future<Process> proc = runDetached(cmd);
-  return new Future.delayed(timeout, () async {
+  return new Future<Null>.delayed(timeout, () async {
     printTrace('Intentionally killing ${cmd[0]}');
     Process.killPid((await proc).pid);
   });

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

@@ -223,7 +223,7 @@ class AnalyzeCommand extends FlutterCommand {
 
     // determine what all the various .packages files depend on
     PackageDependencyTracker dependencies = new PackageDependencyTracker();
-    for (Directory directory in pubSpecDirectories.map((path) => new Directory(path))) {
+    for (Directory directory in pubSpecDirectories.map((String path) => new Directory(path))) {
       String pubSpecYamlPath = path.join(directory.path, 'pubspec.yaml');
       File pubSpecYamlFile = new File(pubSpecYamlPath);
       if (pubSpecYamlFile.existsSync()) {
@@ -242,8 +242,8 @@ class AnalyzeCommand extends FlutterCommand {
         dotPackages
           .readAsStringSync()
           .split('\n')
-          .where((line) => !line.startsWith(new RegExp(r'^ *#')))
-          .forEach((line) {
+          .where((String line) => !line.startsWith(new RegExp(r'^ *#')))
+          .forEach((String line) {
             int colon = line.indexOf(':');
             if (colon > 0)
               dependencies.add(line.substring(0, colon), path.normalize(path.absolute(directory.path, path.fromUri(line.substring(colon+1)))), dotPackagesPath);
@@ -634,7 +634,7 @@ class AnalysisServer {
 
   int _id = 0;
 
-  Future start() async {
+  Future<Null> start() async {
     String snapshot = path.join(sdk, 'bin/snapshots/analysis_server.dart.snapshot');
     List<String> args = <String>[snapshot, '--sdk', sdk];
 
@@ -687,12 +687,12 @@ class AnalysisServer {
 
     dynamic response = JSON.decode(line);
 
-    if (response is Map) {
+    if (response is Map<dynamic, dynamic>) {
       if (response['event'] != null) {
         String event = response['event'];
         dynamic params = response['params'];
 
-        if (params is Map) {
+        if (params is Map<dynamic, dynamic>) {
           if (event == 'server.status')
             _handleStatus(response['params']);
           else if (event == 'analysis.errors')
@@ -725,7 +725,7 @@ class AnalysisServer {
     _errorsController.add(new FileAnalysisErrors(file, errors));
   }
 
-  Future dispose() async => _process?.kill();
+  Future<bool> dispose() async => _process?.kill();
 }
 
 class FileAnalysisErrors {

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

@@ -135,7 +135,7 @@ All done! In order to run your application, type:
 
     printStatus('Creating project ${path.basename(projectName)}:');
 
-    Map templateContext = <String, dynamic>{
+    Map<String, dynamic> templateContext = <String, dynamic>{
       'projectName': projectName,
       'androidIdentifier': _createAndroidIdentifier(projectName),
       'iosIdentifier': _createUTIIdentifier(projectName),

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

@@ -53,7 +53,7 @@ class DaemonCommand extends FlutterCommand {
           return JSON.decode(line);
         });
 
-      Daemon daemon = new Daemon(commandStream, (Map command) {
+      Daemon daemon = new Daemon(commandStream, (Map<String, dynamic> command) {
         stdout.writeln('[${JSON.encode(command, toEncodable: _jsonEncodeObject)}]');
       }, daemonCommand: this, notifyingLogger: notifyingLogger);
 
@@ -73,7 +73,7 @@ typedef void DispatchComand(Map<String, dynamic> command);
 typedef Future<dynamic> CommandHandler(dynamic args);
 
 class Daemon {
-  Daemon(Stream<Map> commandStream, this.sendCommand, {
+  Daemon(Stream<Map<String, dynamic>> commandStream, this.sendCommand, {
     this.daemonCommand,
     this.notifyingLogger
   }) {
@@ -84,7 +84,7 @@ class Daemon {
 
     // Start listening.
     commandStream.listen(
-      (Map request) => _handleRequest(request),
+      (Map<String, dynamic> request) => _handleRequest(request),
       onDone: () => _onExitCompleter.complete(0)
     );
   }
@@ -106,7 +106,7 @@ class Daemon {
 
   Future<int> get onExit => _onExitCompleter.future;
 
-  void _handleRequest(Map request) {
+  void _handleRequest(Map<String, dynamic> request) {
     // {id, method, params}
 
     // [id] is an opaque type to us.
@@ -133,7 +133,7 @@ class Daemon {
     }
   }
 
-  void _send(Map map) => sendCommand(map);
+  void _send(Map<String, dynamic> map) => sendCommand(map);
 
   void shutdown() {
     _domainMap.values.forEach((Domain domain) => domain.dispose());
@@ -147,7 +147,7 @@ abstract class Domain {
 
   final Daemon daemon;
   final String name;
-  final Map<String, CommandHandler> _handlers = {};
+  final Map<String, CommandHandler> _handlers = <String, CommandHandler>{};
 
   void registerHandler(String name, CommandHandler handler) {
     _handlers[name] = handler;
@@ -158,18 +158,18 @@ abstract class Domain {
   String toString() => name;
 
   void handleCommand(String command, dynamic id, dynamic args) {
-    new Future.sync(() {
+    new Future<dynamic>.sync(() {
       if (_handlers.containsKey(command))
         return _handlers[command](args);
       throw 'command not understood: $name.$command';
-    }).then((result) {
+    }).then((dynamic result) {
       if (result == null) {
-        _send({'id': id});
+        _send(<String, dynamic>{'id': id});
       } else {
-        _send({'id': id, 'result': _toJsonable(result)});
+        _send(<String, dynamic>{'id': id, 'result': _toJsonable(result)});
       }
-    }).catchError((error, trace) {
-      _send({'id': id, 'error': _toJsonable(error)});
+    }).catchError((dynamic error, dynamic trace) {
+      _send(<String, dynamic>{'id': id, 'error': _toJsonable(error)});
     });
   }
 
@@ -180,7 +180,7 @@ abstract class Domain {
     _send(map);
   }
 
-  void _send(Map map) => daemon._send(map);
+  void _send(Map<String, dynamic> map) => daemon._send(map);
 
   void dispose() { }
 }
@@ -212,12 +212,12 @@ class DaemonDomain extends Domain {
   StreamSubscription<LogMessage> _subscription;
 
   Future<String> version(dynamic args) {
-    return new Future.value(protocolVersion);
+    return new Future<String>.value(protocolVersion);
   }
 
-  Future shutdown(dynamic args) {
+  Future<Null> shutdown(dynamic args) {
     Timer.run(() => daemon.shutdown());
-    return new Future.value();
+    return new Future<Null>.value();
   }
 
   void dispose() {
@@ -352,23 +352,23 @@ class DeviceDomain extends Domain {
     List<Device> devices = _discoverers.expand((PollingDeviceDiscovery discoverer) {
       return discoverer.devices;
     }).toList();
-    return new Future.value(devices);
+    return new Future<List<Device>>.value(devices);
   }
 
   /// Enable device events.
-  Future enable(dynamic args) {
+  Future<Null> enable(dynamic args) {
     for (PollingDeviceDiscovery discoverer in _discoverers) {
       discoverer.startPolling();
     }
-    return new Future.value();
+    return new Future<Null>.value();
   }
 
   /// Disable device events.
-  Future disable(dynamic args) {
+  Future<Null> disable(dynamic args) {
     for (PollingDeviceDiscovery discoverer in _discoverers) {
       discoverer.stopPolling();
     }
-    return new Future.value();
+    return new Future<Null>.value();
   }
 
   void dispose() {
@@ -398,7 +398,7 @@ String _enumToString(dynamic enumValue) {
 }
 
 dynamic _toJsonable(dynamic obj) {
-  if (obj is String || obj is int || obj is bool || obj is Map || obj is List || obj == null)
+  if (obj is String || obj is int || obj is bool || obj is Map<dynamic, dynamic> || obj is List<dynamic> || obj == null)
     return obj;
   if (obj is Device)
     return obj;

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

@@ -106,7 +106,7 @@ class DriveCommand extends RunCommandBase {
     try {
       return await testRunner([testFile])
         .then((_) => 0)
-        .catchError((error, stackTrace) {
+        .catchError((dynamic error, dynamic stackTrace) {
           printError('CAUGHT EXCEPTION: $error\n$stackTrace');
           return 1;
         });
@@ -182,9 +182,9 @@ Future<Device> findTargetDevice() async {
     // we look for an Android device. If there's one, we use that. Otherwise,
     // we launch a new iOS Simulator.
     Device reusableDevice = devices.firstWhere(
-      (d) => d.isLocalEmulator,
+      (Device d) => d.isLocalEmulator,
       orElse: () {
-        return devices.firstWhere((d) => d is AndroidDevice,
+        return devices.firstWhere((Device d) => d is AndroidDevice,
             orElse: () => null);
       }
     );
@@ -210,7 +210,7 @@ Future<Device> findTargetDevice() async {
       return null;
     } else if (devices.length > 1) {
       printStatus('Found multiple connected devices:');
-      printStatus(devices.map((d) => '  - ${d.name}\n').join(''));
+      printStatus(devices.map((Device d) => '  - ${d.name}\n').join(''));
     }
     printStatus('Using device ${devices.first.name}.');
     return devices.first;

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

@@ -38,7 +38,7 @@ class LogsCommand extends FlutterCommand {
     if (!logReader.isReading)
       await logReader.start();
 
-    StreamSubscription subscription = logReader.lines.listen(printStatus);
+    StreamSubscription<String> subscription = logReader.lines.listen(printStatus);
 
     // Wait for the log reader to be finished.
     int result = await logReader.finished;

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

@@ -185,7 +185,7 @@ Future<int> startApp(
   }
 
   // Allow any stop commands from above to start work.
-  await new Future.delayed(Duration.ZERO);
+  await new Future<Duration>.delayed(Duration.ZERO);
 
   if (install) {
     printTrace('Running install command.');
@@ -234,7 +234,7 @@ Future<int> startApp(
 ///
 /// This does not fail if we're unable to connect, and times out after the given
 /// [timeout].
-Future delayUntilObservatoryAvailable(String host, int port, {
+Future<Null> delayUntilObservatoryAvailable(String host, int port, {
   Duration timeout: const Duration(seconds: 10)
 }) async {
   Stopwatch stopwatch = new Stopwatch()..start();
@@ -246,10 +246,10 @@ Future delayUntilObservatoryAvailable(String host, int port, {
     try {
       WebSocket ws = await WebSocket.connect(url);
       printTrace('Connected to the observatory port.');
-      ws.close().catchError((error) => null);
+      ws.close().catchError((dynamic error) => null);
       return;
     } catch (error) {
-      await new Future.delayed(new Duration(milliseconds: 250));
+      await new Future<Null>.delayed(new Duration(milliseconds: 250));
     }
   }
 

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

@@ -22,7 +22,7 @@ class RunMojoCommand extends FlutterCommand {
   final String description = 'Run a Flutter app in mojo (from github.com/domokit/mojo).';
   final bool _hideCommand;
 
-  RunMojoCommand({ hideCommand: false }) : _hideCommand = hideCommand {
+  RunMojoCommand({ bool hideCommand: false }) : _hideCommand = hideCommand {
     argParser.addFlag('android', negatable: false, help: 'Run on an Android device');
     argParser.addFlag('checked', negatable: false, help: 'Run Flutter in checked mode');
     argParser.addFlag('mojo-debug', negatable: false, help: 'Use Debug build of mojo');
@@ -64,7 +64,7 @@ class RunMojoCommand extends FlutterCommand {
   }
 
   String _getMojoShellPath() {
-    final mojoBuildType = argResults['mojo-debug']  ? 'Debug' : 'Release';
+    final String mojoBuildType = argResults['mojo-debug']  ? 'Debug' : 'Release';
     return _makePathAbsolute(path.join(argResults['mojo-path'], 'out', mojoBuildType, 'mojo_shell'));
   }
 

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

@@ -41,7 +41,7 @@ class TraceCommand extends FlutterCommand {
       // Setting neither flags or both flags means do both commands and wait
       // duration seconds in between.
       device.startTracing(androidApp);
-      await new Future.delayed(
+      await new Future<Null>.delayed(
         new Duration(seconds: int.parse(argResults['duration'])),
         () => _stopTracing(device, androidApp)
       );
@@ -53,7 +53,7 @@ class TraceCommand extends FlutterCommand {
     return 0;
   }
 
-  Future _stopTracing(AndroidDevice android, AndroidApk androidApp) async {
+  Future<Null> _stopTracing(AndroidDevice android, AndroidApk androidApp) async {
     String tracePath = await android.stopTracing(androidApp, outPath: argResults['out']);
     if (tracePath == null) {
       printError('No trace file saved.');

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

@@ -24,7 +24,7 @@ Future<int> _runPub(Directory directory, { bool upgrade: false }) async {
 }
 
 class UpdatePackagesCommand extends FlutterCommand {
-  UpdatePackagesCommand({ hideCommand: false }) : _hideCommand = hideCommand {
+  UpdatePackagesCommand({ bool hideCommand: false }) : _hideCommand = hideCommand {
     argParser.addFlag(
       'upgrade',
       help: 'Run "pub upgrade" rather than "pub get".',

packages/flutter_tools/lib/src/device.dart

@@ -225,7 +225,7 @@ abstract class DevicePortForwarder {
   Future<int> forward(int devicePort, {int hostPort: null});
 
   /// Stops forwarding [forwardedPort].
-  Future unforward(ForwardedPort forwardedPort);
+  Future<Null> unforward(ForwardedPort forwardedPort);
 }
 
 /// Read the log for a particular device. Subclasses must implement `hashCode`
@@ -240,16 +240,16 @@ abstract class DeviceLogReader {
   Stream<String> get lines;
 
   /// Start reading logs from the device.
-  Future start();
+  Future<Null> start();
 
   /// Actively reading lines from the log?
   bool get isReading;
 
   /// Actively stop reading logs from the device.
-  Future stop();
+  Future<Null> stop();
 
   /// Completes when the log is finished.
-  Future get finished;
+  Future<int> get finished;
 
   int get hashCode;
   bool operator ==(dynamic other);

packages/flutter_tools/lib/src/flx.dart

@@ -38,7 +38,7 @@ class _Asset {
 
 const String _kMaterialIconsKey = 'fonts/MaterialIcons-Regular.ttf';
 
-List _getMaterialFonts() {
+List<Map<String, dynamic>> _getMaterialFonts() {
   return [{
     'family': 'MaterialIcons',
     'fonts': [{
@@ -57,7 +57,7 @@ List<_Asset> _getMaterialAssets() {
   ];
 }
 
-Map<_Asset, List<_Asset>> _parseAssets(Map manifestDescriptor, String assetBase) {
+Map<_Asset, List<_Asset>> _parseAssets(Map<String, dynamic> manifestDescriptor, String assetBase) {
   Map<_Asset, List<_Asset>> result = <_Asset, List<_Asset>>{};
   if (manifestDescriptor == null)
     return result;
@@ -112,8 +112,8 @@ ZipEntry _createAssetManifest(Map<_Asset, List<_Asset>> assets) {
   return new ZipEntry.fromString('AssetManifest.json', JSON.encode(json));
 }
 
-ZipEntry _createFontManifest(Map manifestDescriptor, List additionalFonts) {
-  List fonts = [];
+ZipEntry _createFontManifest(Map<String, dynamic> manifestDescriptor, List<Map<String, dynamic>> additionalFonts) {
+  List<Map<String, dynamic>> fonts = <Map<String, dynamic>>[];
   if (additionalFonts != null)
     fonts.addAll(additionalFonts);
   if (manifestDescriptor != null && manifestDescriptor.containsKey('fonts'))
@@ -167,7 +167,7 @@ Future<int> build(
   String workingDirPath: defaultWorkingDirPath,
   bool precompiledSnapshot: false
 }) async {
-  Map manifestDescriptor = _loadManifest(manifestPath);
+  Map<String, dynamic> manifestDescriptor = _loadManifest(manifestPath);
   String assetBasePath = path.dirname(path.absolute(manifestPath));
 
   File snapshotFile;
@@ -197,7 +197,7 @@ Future<int> build(
 }
 
 Future<int> assemble({
-  Map manifestDescriptor: const {},
+  Map<String, dynamic> manifestDescriptor: const <String, dynamic>{},
   File snapshotFile,
   String assetBasePath: defaultAssetBasePath,
   String outputPath: defaultFlxOutputPath,
@@ -244,7 +244,7 @@ Future<int> assemble({
   if (fontManifest != null)
     zipBuilder.addEntry(fontManifest);
 
-  AsymmetricKeyPair keyPair = keyPairFromPrivateKeyFileSync(privateKeyPath);
+  AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyPairFromPrivateKeyFileSync(privateKeyPath);
   printTrace('KeyPair from $privateKeyPath: $keyPair.');
 
   if (keyPair != null) {

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

@@ -253,8 +253,8 @@ class _IOSDeviceLogReader extends DeviceLogReader {
       new StreamController<String>.broadcast();
 
   Process _process;
-  StreamSubscription _stdoutSubscription;
-  StreamSubscription _stderrSubscription;
+  StreamSubscription<String> _stdoutSubscription;
+  StreamSubscription<String> _stderrSubscription;
 
   Stream<String> get lines => _linesStreamController.stream;
 
@@ -262,13 +262,15 @@ class _IOSDeviceLogReader extends DeviceLogReader {
 
   bool get isReading => _process != null;
 
-  Future get finished =>
-      _process != null ? _process.exitCode : new Future.value(0);
+  Future<int> get finished {
+    return _process != null ? _process.exitCode : new Future<int>.value(0);
+  }
 
-  Future start() async {
+  Future<Null> start() async {
     if (_process != null) {
       throw new StateError(
-          '_IOSDeviceLogReader must be stopped before it can be started.');
+        '_IOSDeviceLogReader must be stopped before it can be started.'
+      );
     }
     _process = await runCommand(<String>[device.loggerPath]);
     _stdoutSubscription =
@@ -280,10 +282,11 @@ class _IOSDeviceLogReader extends DeviceLogReader {
     _process.exitCode.then(_onExit);
   }
 
-  Future stop() async {
+  Future<Null> stop() async {
     if (_process == null) {
       throw new StateError(
-          '_IOSDeviceLogReader must be started before it can be stopped.');
+        '_IOSDeviceLogReader must be started before it can be stopped.'
+      );
     }
     _stdoutSubscription?.cancel();
     _stdoutSubscription = null;
@@ -341,7 +344,7 @@ class _IOSDevicePortForwarder extends DevicePortForwarder {
     return hostPort;
   }
 
-  Future unforward(ForwardedPort forwardedPort) async {
+  Future<Null> unforward(ForwardedPort forwardedPort) async {
     // TODO(chinmaygarde): Implement.
   }
 }

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

@@ -181,7 +181,7 @@ String _getIOSEngineRevision(ApplicationPackage app) {
   }
 }
 
-Future _addServicesToBundle(Directory bundle) async {
+Future<Null> _addServicesToBundle(Directory bundle) async {
   List<Map<String, String>> services = [];
   printTrace("Trying to resolve native pub services.");
 
@@ -200,7 +200,7 @@ Future _addServicesToBundle(Directory bundle) async {
   _copyServiceDefinitionsManifest(services, manifestFile);
 }
 
-Future _copyServiceFrameworks(List<Map<String, String>> services, Directory frameworksDirectory) async {
+Future<Null> _copyServiceFrameworks(List<Map<String, String>> services, Directory frameworksDirectory) async {
   printTrace("Copying service frameworks to '${path.absolute(frameworksDirectory.path)}'.");
   frameworksDirectory.createSync(recursive: true);
   for (Map<String, String> service in services) {

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

@@ -79,7 +79,7 @@ class SimControl {
       connected = await _isAnyConnected();
       if (!connected) {
         printStatus('Still waiting for iOS Simulator to boot...');
-        await new Future.delayed(new Duration(seconds: 1));
+        await new Future<Null>.delayed(new Duration(seconds: 1));
       }
       attempted++;
     }
@@ -106,7 +106,7 @@ class SimControl {
 
     // Delete any old test devices
     getDevices()
-      .where((d) => d.name == _kFlutterTestDevice)
+      .where((SimDevice d) => d.name == _kFlutterTestDevice)
       .forEach(_deleteDevice);
 
     // Create new device
@@ -114,15 +114,15 @@ class SimControl {
     printTrace(args.join(' '));
     runCheckedSync(args);
 
-    return getDevices().firstWhere((d) => d.name == _kFlutterTestDevice);
+    return getDevices().firstWhere((SimDevice d) => d.name == _kFlutterTestDevice);
   }
 
   String _findSuitableDeviceType() {
     List<Map<String, dynamic>> allTypes = _list(SimControlListSection.devicetypes);
     List<Map<String, dynamic>> usableTypes = allTypes
-      .where((info) => info['name'].startsWith('iPhone'))
+      .where((Map<String, dynamic> info) => info['name'].startsWith('iPhone'))
       .toList()
-      ..sort((r1, r2) => -compareIphoneVersions(r1['identifier'], r2['identifier']));
+      ..sort((Map<String, dynamic> r1, Map<String, dynamic> r2) => -compareIphoneVersions(r1['identifier'], r2['identifier']));
 
     if (usableTypes.isEmpty) {
       printError(
@@ -139,9 +139,9 @@ class SimControl {
   String _findSuitableRuntime() {
     List<Map<String, dynamic>> allRuntimes = _list(SimControlListSection.runtimes);
     List<Map<String, dynamic>> usableRuntimes = allRuntimes
-      .where((info) => info['name'].startsWith('iOS'))
+      .where((Map<String, dynamic> info) => info['name'].startsWith('iOS'))
       .toList()
-      ..sort((r1, r2) => -compareIosVersions(r1['version'], r2['version']));
+      ..sort((Map<String, dynamic> r1, Map<String, dynamic> r2) => -compareIosVersions(r1['version'], r2['version']));
 
     if (usableRuntimes.isEmpty) {
       printError(
@@ -206,7 +206,7 @@ class SimControl {
     Map<String, dynamic> devicesSection = _list(SimControlListSection.devices);
 
     for (String deviceCategory in devicesSection.keys) {
-      List<dynamic> devicesData = devicesSection[deviceCategory];
+      List<Map<String, String>> devicesData = devicesSection[deviceCategory];
 
       for (Map<String, String> data in devicesData) {
         devices.add(new SimDevice(deviceCategory, data));
@@ -232,15 +232,12 @@ class SimControl {
     if (_trackDevicesControler == null) {
       Timer timer;
       Set<String> deviceIds = new Set<String>();
-
-      _trackDevicesControler = new StreamController.broadcast(
+      _trackDevicesControler = new StreamController<List<SimDevice>>.broadcast(
         onListen: () {
           timer = new Timer.periodic(new Duration(seconds: 4), (Timer timer) {
             List<SimDevice> devices = getConnectedDevices();
-
-            if (_updateDeviceIds(devices, deviceIds)) {
+            if (_updateDeviceIds(devices, deviceIds))
               _trackDevicesControler.add(devices);
-            }
           });
         }, onCancel: () {
           timer?.cancel();
@@ -290,13 +287,14 @@ class SimControl {
 
 /// Enumerates all data sections of `xcrun simctl list --json` command.
 class SimControlListSection {
-  static const devices = const SimControlListSection._('devices');
-  static const devicetypes = const SimControlListSection._('devicetypes');
-  static const runtimes = const SimControlListSection._('runtimes');
-  static const pairs = const SimControlListSection._('pairs');
+  const SimControlListSection._(this.name);
 
   final String name;
-  const SimControlListSection._(this.name);
+
+  static const SimControlListSection devices = const SimControlListSection._('devices');
+  static const SimControlListSection devicetypes = const SimControlListSection._('devicetypes');
+  static const SimControlListSection runtimes = const SimControlListSection._('runtimes');
+  static const SimControlListSection pairs = const SimControlListSection._('pairs');
 }
 
 class SimDevice {
@@ -580,12 +578,12 @@ class _IOSSimulatorLogReader extends DeviceLogReader {
 
   // We log from two logs: the device and the system log.
   Process _deviceProcess;
-  StreamSubscription _deviceStdoutSubscription;
-  StreamSubscription _deviceStderrSubscription;
+  StreamSubscription<String> _deviceStdoutSubscription;
+  StreamSubscription<String> _deviceStderrSubscription;
 
   Process _systemProcess;
-  StreamSubscription _systemStdoutSubscription;
-  StreamSubscription _systemStderrSubscription;
+  StreamSubscription<String> _systemStdoutSubscription;
+  StreamSubscription<String> _systemStderrSubscription;
 
   Stream<String> get lines => _linesStreamController.stream;
 
@@ -593,13 +591,15 @@ class _IOSSimulatorLogReader extends DeviceLogReader {
 
   bool get isReading => (_deviceProcess != null) && (_systemProcess != null);
 
-  Future get finished =>
-      (_deviceProcess != null) ? _deviceProcess.exitCode : new Future.value(0);
+  Future<int> get finished {
+    return (_deviceProcess != null) ? _deviceProcess.exitCode : new Future<int>.value(0);
+  }
 
-  Future start() async {
+  Future<Null> start() async {
     if (isReading) {
       throw new StateError(
-          '_IOSSimulatorLogReader must be stopped before it can be started.');
+        '_IOSSimulatorLogReader must be stopped before it can be started.'
+      );
     }
 
     // TODO(johnmccutchan): Add a ProcessSet abstraction that handles running
@@ -630,10 +630,11 @@ class _IOSSimulatorLogReader extends DeviceLogReader {
     _systemProcess.exitCode.then(_onSystemExit);
   }
 
-  Future stop() async {
+  Future<Null> stop() async {
     if (!isReading) {
       throw new StateError(
-          '_IOSSimulatorLogReader must be started before it can be stopped.');
+        '_IOSSimulatorLogReader must be started before it can be stopped.'
+      );
     }
     if (_deviceProcess != null) {
       await _deviceProcess.kill();
@@ -774,7 +775,7 @@ int compareIphoneVersions(String id1, String id2) {
     return v1.compareTo(v2);
 
   // Sorted in the least preferred first order.
-  const qualifiers = const <String>['-Plus', '', 's-Plus', 's'];
+  const List<String> qualifiers = const <String>['-Plus', '', 's-Plus', 's'];
 
   int q1 = qualifiers.indexOf(m1[2]);
   int q2 = qualifiers.indexOf(m2[2]);
@@ -801,7 +802,7 @@ class _IOSSimulatorDevicePortForwarder extends DevicePortForwarder {
     return hostPort;
   }
 
-  Future unforward(ForwardedPort forwardedPort) async {
+  Future<Null> unforward(ForwardedPort forwardedPort) async {
     _ports.remove(forwardedPort);
   }
 }

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

@@ -35,11 +35,11 @@ abstract class FlutterCommand extends Command {
 
   List<BuildConfiguration> get buildConfigurations => runner.buildConfigurations;
 
-  Future downloadToolchain() async {
+  Future<Null> downloadToolchain() async {
     toolchain ??= await Toolchain.forConfigs(buildConfigurations);
   }
 
-  Future downloadApplicationPackages() async {
+  Future<Null> downloadApplicationPackages() async {
     applicationPackages ??= await ApplicationPackageStore.forConfigs(buildConfigurations);
   }
 
@@ -127,7 +127,7 @@ abstract class FlutterCommand extends Command {
   void addTargetOption() {
     argParser.addOption('target',
       abbr: 't',
-      callback: (val) => _targetSpecified = true,
+      callback: (dynamic val) => _targetSpecified = true,
       defaultsTo: flx.defaultMainPath,
       help: 'Target app path / main entry-point file.');
     _targetOptionSpecified = true;

packages/flutter_tools/lib/src/service_protocol.dart

@@ -19,7 +19,7 @@ class ServiceProtocolDiscovery {
   }
 
   final DeviceLogReader _logReader;
-  Completer _completer = new Completer();
+  Completer<int> _completer = new Completer<int>();
 
   /// The [Future] returned by this function will complete when the next
   /// service protocol port is found.
@@ -32,21 +32,20 @@ class ServiceProtocolDiscovery {
     if (line.startsWith('Observatory listening on http://')) {
       try {
         RegExp portExp = new RegExp(r"\d+.\d+.\d+.\d+:(\d+)");
-        var port = portExp.firstMatch(line).group(1);
+        String port = portExp.firstMatch(line).group(1);
         portNumber = int.parse(port);
       } catch (_) {
         // Ignore errors.
       }
     }
-    if (portNumber != 0) {
+    if (portNumber != 0)
       _located(portNumber);
-    }
   }
 
   void _located(int port) {
     assert(_completer != null);
     assert(!_completer.isCompleted);
     _completer.complete(port);
-    _completer = new Completer();
+    _completer = new Completer<int>();
   }
 }

packages/flutter_tools/lib/src/services.dart

@@ -25,7 +25,7 @@ dynamic _loadYamlFile(String path) {
 
 /// Loads all services specified in `flutter.yaml`. Parses each service config file,
 /// storing metadata in [services] and the list of jar files in [jars].
-Future parseServiceConfigs(
+Future<Null> parseServiceConfigs(
   List<Map<String, String>> services, { List<File> jars }
 ) async {
   if (!ArtifactStore.isPackageRootValid) {

packages/flutter_tools/lib/src/test/flutter_platform.dart

@@ -55,11 +55,11 @@ Future<Process> _startProcess(String mainPath, { String packageRoot }) {
 }
 
 class FlutterPlatform extends PlatformPlugin {
-  StreamChannel loadChannel(String mainPath, TestPlatform platform) {
+  StreamChannel<String> loadChannel(String mainPath, TestPlatform platform) {
     return StreamChannelCompleter.fromFuture(_startTest(mainPath));
   }
 
-  Future<StreamChannel> _startTest(String mainPath) async {
+  Future<StreamChannel<String>> _startTest(String mainPath) async {
     _ServerInfo info = await _startServer();
     Directory tempDir = Directory.systemTemp.createTempSync(
         'dart_test_listener');
@@ -108,19 +108,19 @@ void main() {
 
     try {
       WebSocket socket = await info.socket;
-      StreamChannel channel = new StreamChannel(socket.map(JSON.decode), socket);
+      StreamChannel<String> channel = new StreamChannel<String>(socket.map(JSON.decode), socket);
       return channel.transformStream(
-        new StreamTransformer.fromHandlers(
-          handleDone: (sink) {
+        new StreamTransformer<String, String>.fromHandlers(
+          handleDone: (EventSink<String> sink) {
             finalize();
             sink.close();
           }
         )
-      ).transformSink(new StreamSinkTransformer.fromHandlers(
-        handleData: (data, StreamSink sink) {
+      ).transformSink(new StreamSinkTransformer<String, String>.fromHandlers(
+        handleData: (String data, StreamSink<String> sink) {
           sink.add(JSON.encode(data));
         },
-        handleDone: (sink) {
+        handleDone: (EventSink<String> sink) {
           finalize();
           sink.close();
         }

packages/flutter_tools/test/analyze_test.dart

@@ -36,7 +36,7 @@ void main() {
       server = new AnalysisServer(dartSdkPath, <String>[tempDir.path]);
 
       int errorCount = 0;
-      Future onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
+      Future<bool> onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
       server.onErrors.listen((FileAnalysisErrors errors) => errorCount += errors.errors.length);
 
       await server.start();
@@ -55,7 +55,7 @@ void main() {
       server = new AnalysisServer(dartSdkPath, <String>[tempDir.path]);
 
       int errorCount = 0;
-      Future onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
+      Future<bool> onDone = server.onAnalyzing.where((bool analyzing) => analyzing == false).first;
       server.onErrors.listen((FileAnalysisErrors errors) => errorCount += errors.errors.length);
 
       await server.start();

packages/flutter_tools/test/daemon_test.dart

@@ -45,15 +45,15 @@ void main() {
     });
 
     _testUsingContext('daemon.version', () async {
-      StreamController<Map<String, dynamic>> commands = new StreamController();
-      StreamController<Map<String, dynamic>> responses = new StreamController();
+      StreamController<Map<String, dynamic>> commands = new StreamController<Map<String, dynamic>>();
+      StreamController<Map<String, dynamic>> responses = new StreamController<Map<String, dynamic>>();
       daemon = new Daemon(
         commands.stream,
         (Map<String, dynamic> result) => responses.add(result),
         notifyingLogger: notifyingLogger
       );
-      commands.add({'id': 0, 'method': 'daemon.version'});
-      Map response = await responses.stream.where(_notEvent).first;
+      commands.add(<String, dynamic>{'id': 0, 'method': 'daemon.version'});
+      Map<String, dynamic> response = await responses.stream.where(_notEvent).first;
       expect(response['id'], 0);
       expect(response['result'], isNotEmpty);
       expect(response['result'] is String, true);
@@ -61,8 +61,8 @@ void main() {
 
     _testUsingContext('daemon.logMessage', () {
       return appContext.runInZone(() async {
-        StreamController<Map<String, dynamic>> commands = new StreamController();
-        StreamController<Map<String, dynamic>> responses = new StreamController();
+        StreamController<Map<String, dynamic>> commands = new StreamController<Map<String, dynamic>>();
+        StreamController<Map<String, dynamic>> responses = new StreamController<Map<String, dynamic>>();
         daemon = new Daemon(
           commands.stream,
           (Map<String, dynamic> result) => responses.add(result),
@@ -81,8 +81,8 @@ void main() {
     });
 
     _testUsingContext('daemon.shutdown', () async {
-      StreamController<Map<String, dynamic>> commands = new StreamController();
-      StreamController<Map<String, dynamic>> responses = new StreamController();
+      StreamController<Map<String, dynamic>> commands = new StreamController<Map<String, dynamic>>();
+      StreamController<Map<String, dynamic>> responses = new StreamController<Map<String, dynamic>>();
       daemon = new Daemon(
         commands.stream,
         (Map<String, dynamic> result) => responses.add(result),
@@ -98,8 +98,8 @@ void main() {
       DaemonCommand command = new DaemonCommand();
       applyMocksToCommand(command);
 
-      StreamController<Map<String, dynamic>> commands = new StreamController();
-      StreamController<Map<String, dynamic>> responses = new StreamController();
+      StreamController<Map<String, dynamic>> commands = new StreamController<Map<String, dynamic>>();
+      StreamController<Map<String, dynamic>> responses = new StreamController<Map<String, dynamic>>();
       daemon = new Daemon(
         commands.stream,
         (Map<String, dynamic> result) => responses.add(result),
@@ -108,21 +108,21 @@ void main() {
       );
 
       commands.add(<String, dynamic>{ 'id': 0, 'method': 'app.stop' });
-      Map response = await responses.stream.where(_notEvent).first;
+      Map<String, dynamic> response = await responses.stream.where(_notEvent).first;
       expect(response['id'], 0);
       expect(response['error'], contains('deviceId is required'));
     });
 
     _testUsingContext('device.getDevices', () async {
-      StreamController<Map<String, dynamic>> commands = new StreamController();
-      StreamController<Map<String, dynamic>> responses = new StreamController();
+      StreamController<Map<String, dynamic>> commands = new StreamController<Map<String, dynamic>>();
+      StreamController<Map<String, dynamic>> responses = new StreamController<Map<String, dynamic>>();
       daemon = new Daemon(
         commands.stream,
         (Map<String, dynamic> result) => responses.add(result),
         notifyingLogger: notifyingLogger
       );
       commands.add({'id': 0, 'method': 'device.getDevices'});
-      Map response = await responses.stream.where(_notEvent).first;
+      Map<String, dynamic> response = await responses.stream.where(_notEvent).first;
       expect(response['id'], 0);
       expect(response['result'], isList);
     });

packages/flutter_tools/test/service_protocol_test.dart

@@ -16,7 +16,7 @@ void main() {
       ServiceProtocolDiscovery discoverer =
           new ServiceProtocolDiscovery(logReader);
       // Get next port future.
-      Future nextPort = discoverer.nextPort();
+      Future<int> nextPort = discoverer.nextPort();
       expect(nextPort, isNotNull);
       // Inject some lines.
       logReader.addLine('HELLO WORLD');

packages/flutter_tools/test/src/context.dart

@@ -72,11 +72,11 @@ class MockDeviceManager implements DeviceManager {
   String specifiedDeviceId;
   bool get hasSpecifiedDeviceId => specifiedDeviceId != null;
 
-  Future<List<Device>> getAllConnectedDevices() => new Future.value(devices);
+  Future<List<Device>> getAllConnectedDevices() => new Future<List<Device>>.value(devices);
 
   Future<Device> getDeviceById(String deviceId) {
     Device device = devices.firstWhere((Device device) => device.id == deviceId, orElse: () => null);
-    return new Future.value(device);
+    return new Future<Device>.value(device);
   }
 
   Future<List<Device>> getDevices() async {

packages/flutter_tools/test/src/mocks.dart

@@ -52,7 +52,7 @@ class MockDeviceLogReader extends DeviceLogReader {
   final StreamController<String> _linesStreamController =
       new StreamController<String>.broadcast();
 
-  final Completer _finishedCompleter = new Completer();
+  final Completer<int> _finishedCompleter = new Completer<int>();
 
   Stream<String> get lines => _linesStreamController.stream;
 
@@ -62,21 +62,20 @@ class MockDeviceLogReader extends DeviceLogReader {
 
   bool _started = false;
 
-  Future start() {
+  Future<Null> start() async {
     assert(!_started);
     _started = true;
-    return new Future.value(this);
   }
 
   bool get isReading => _started;
 
-  Future stop() {
+  Future<Null> stop() {
     assert(_started);
     _started = false;
-    return new Future.value(this);
+    return new Future<Null>.value();
   }
 
-  Future get finished => _finishedCompleter.future;
+  Future<int> get finished => _finishedCompleter.future;
 }
 
 void applyMocksToCommand(FlutterCommand command) {

packages/flutter_tools/test/stop_test.dart

@@ -18,7 +18,7 @@ void main() {
       StopCommand command = new StopCommand();
       applyMocksToCommand(command);
       MockAndroidDevice device = new MockAndroidDevice();
-      when(device.stopApp(any)).thenReturn(new Future.value(true));
+      when(device.stopApp(any)).thenReturn(new Future<bool>.value(true));
       testDeviceManager.addDevice(device);
       return createTestCommandRunner(command).run(['stop']).then((int code) {
         expect(code, equals(0));
@@ -29,7 +29,7 @@ void main() {
       StopCommand command = new StopCommand();
       applyMocksToCommand(command);
       MockIOSDevice device = new MockIOSDevice();
-      when(device.stopApp(any)).thenReturn(new Future.value(true));
+      when(device.stopApp(any)).thenReturn(new Future<bool>.value(true));
       testDeviceManager.addDevice(device);
 
       return createTestCommandRunner(command).run(['stop']).then((int code) {

packages/flx/lib/bundle.dart

@@ -72,14 +72,14 @@ class Bundle {
     this.path,
     this.manifest,
     List<int> contentBytes,
-    AsymmetricKeyPair keyPair
+    AsymmetricKeyPair<PublicKey, PrivateKey> keyPair
   }) : _contentBytes = contentBytes {
     assert(path != null);
     assert(manifest != null);
     assert(_contentBytes != null);
     manifestBytes = serializeManifest(manifest, keyPair?.publicKey, _contentBytes);
     signatureBytes = signManifest(manifestBytes, keyPair?.privateKey);
-    _openContentStream = () => new Stream.fromIterable(<List<int>>[_contentBytes]);
+    _openContentStream = () => new Stream<List<int>>.fromIterable(<List<int>>[_contentBytes]);
   }
 
   final String path;

packages/flx/lib/signing.dart

@@ -12,7 +12,7 @@ import 'package:bignum/bignum.dart';
 import 'package:crypto/crypto.dart';
 import 'package:pointycastle/pointycastle.dart';
 
-export 'package:pointycastle/pointycastle.dart' show AsymmetricKeyPair;
+export 'package:pointycastle/pointycastle.dart' show AsymmetricKeyPair, PublicKey, PrivateKey;
 
 // The ECDSA algorithm parameters we're using. These match the parameters used
 // by the Flutter updater package.
@@ -50,7 +50,7 @@ class CipherParameters {
   SecureRandom _random;
   void _initRandom(Uint8List key, Uint8List iv) {
     KeyParameter keyParam = new KeyParameter(key);
-    ParametersWithIV params = new ParametersWithIV(keyParam, iv);
+    ParametersWithIV<KeyParameter> params = new ParametersWithIV<KeyParameter>(keyParam, iv);
     _random = new SecureRandom('AES/CTR/AUTO-SEED-PRNG')
         ..seed(params);
   }
@@ -65,7 +65,7 @@ final CipherParameters _params = CipherParameters._init();
 
 // Returns a serialized manifest, with the public key and hash of the content
 // included.
-Uint8List serializeManifest(Map manifestDescriptor, ECPublicKey publicKey, Uint8List zipBytes) {
+Uint8List serializeManifest(Map<String, dynamic> manifestDescriptor, ECPublicKey publicKey, Uint8List zipBytes) {
   if (manifestDescriptor == null)
     return null;
   final List<String> kSavedKeys = <String>[
@@ -73,8 +73,8 @@ Uint8List serializeManifest(Map manifestDescriptor, ECPublicKey publicKey, Uint8
     'version',
     'update-url'
   ];
-  Map outputManifest = new Map();
-  manifestDescriptor.forEach((key, value) {
+  Map<String, dynamic> outputManifest = new Map<String, dynamic>();
+  manifestDescriptor.forEach((String key, dynamic value) {
     if (kSavedKeys.contains(key))
       outputManifest[key] = value;
   });
@@ -97,8 +97,8 @@ Uint8List signManifest(Uint8List manifestBytes, ECPrivateKey privateKey) {
   if (manifestBytes == null || privateKey == null)
     return new Uint8List(0);
   Signer signer = new Signer(_params.signerAlgorithm);
-  PrivateKeyParameter params = new PrivateKeyParameter(privateKey);
-  signer.init(true, new ParametersWithRandom(params, _params.random));
+  PrivateKeyParameter<PrivateKey> params = new PrivateKeyParameter<PrivateKey>(privateKey);
+  signer.init(true, new ParametersWithRandom<PrivateKeyParameter<PrivateKey>>(params, _params.random));
   ECSignature signature = signer.generateSignature(manifestBytes);
   ASN1Sequence asn1 = new ASN1Sequence()
     ..add(new ASN1Integer(signature.r))
@@ -115,10 +115,10 @@ bool verifyManifestSignature(Map<String, dynamic> manifest,
 
   List<int> keyBytes = BASE64.decode(manifest['key']);
   ECPoint q = _params.domain.curve.decodePoint(keyBytes);
-  ECPublicKey publicKey = new ECPublicKey(q, _params.domain);
+  PublicKey publicKey = new ECPublicKey(q, _params.domain);
 
   Signer signer = new Signer(_params.signerAlgorithm);
-  signer.init(false, new PublicKeyParameter(publicKey));
+  signer.init(false, new PublicKeyParameter<PublicKey>(publicKey));
   return signer.verifySignature(manifestBytes, signature);
 }
 
@@ -166,24 +166,24 @@ ECSignature _asn1ParseSignature(Uint8List signature) {
   }
 }
 
-ECPublicKey _publicKeyFromPrivateKey(ECPrivateKey privateKey) {
+PublicKey _publicKeyFromPrivateKey(ECPrivateKey privateKey) {
   ECPoint Q = privateKey.parameters.G * privateKey.d;
   return new ECPublicKey(Q, privateKey.parameters);
 }
 
-AsymmetricKeyPair keyPairFromPrivateKeyFileSync(String privateKeyPath) {
+AsymmetricKeyPair<PublicKey, PrivateKey> keyPairFromPrivateKeyFileSync(String privateKeyPath) {
   File file = new File(privateKeyPath);
   if (!file.existsSync())
     return null;
   return keyPairFromPrivateKeyBytes(file.readAsBytesSync());
 }
 
-AsymmetricKeyPair keyPairFromPrivateKeyBytes(List<int> privateKeyBytes) {
+AsymmetricKeyPair<PublicKey, PrivateKey> keyPairFromPrivateKeyBytes(List<int> privateKeyBytes) {
   ECPrivateKey privateKey = _asn1ParsePrivateKey(
       _params.domain, new Uint8List.fromList(privateKeyBytes));
   if (privateKey == null)
     return null;
 
-  ECPublicKey publicKey = _publicKeyFromPrivateKey(privateKey);
-  return new AsymmetricKeyPair(publicKey, privateKey);
+  PublicKey publicKey = _publicKeyFromPrivateKey(privateKey);
+  return new AsymmetricKeyPair<PublicKey, PrivateKey>(publicKey, privateKey);
 }

packages/flx/test/bundle_test.dart

@@ -8,7 +8,7 @@ import 'package:flx/bundle.dart';
 import 'package:flx/signing.dart';
 import 'package:test/test.dart';
 
-Future main() async {
+Future<Null> main() async {
   // The following constant was generated via the openssl shell commands:
   // openssl ecparam -genkey -name prime256v1 -out privatekey.pem
   // openssl ec -in privatekey.pem -outform DER | base64
@@ -28,9 +28,10 @@ Future main() async {
   Directory tempDir = await Directory.systemTemp.createTempSync('bundle_test');
   String bundlePath = tempDir.path + '/bundle.flx';
 
-  AsymmetricKeyPair keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
+  AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
   Map<String, dynamic> manifest = JSON.decode(UTF8.decode(
-      serializeManifest(kManifest, keyPair.publicKey, kTestBytes)));
+    serializeManifest(kManifest, keyPair.publicKey, kTestBytes)
+  ));
 
   test('verifyContent works', () async {
     Bundle bundle = new Bundle.fromContent(

packages/flx/test/signing_test.dart

@@ -8,7 +8,7 @@ import 'package:crypto/crypto.dart';
 import 'package:flx/signing.dart';
 import 'package:test/test.dart';
 
-Future main() async {
+Future<Null> main() async {
   // The following constant was generated via the openssl shell commands:
   // openssl ecparam -genkey -name prime256v1 -out privatekey.pem
   // openssl ec -in privatekey.pem -outform DER | base64
@@ -42,18 +42,21 @@ Future main() async {
   keyGenerator.init(keyGeneratorParams);
 
   test('can read openssl key pair', () {
-    AsymmetricKeyPair keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
+    AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
     expect(keyPair != null, equals(true));
-    expect(keyPair.privateKey.d.intValue(), equals(kPrivateKeyD));
-    expect(keyPair.publicKey.Q.x.toBigInteger().intValue(), equals(kPublicKeyQx));
-    expect(keyPair.publicKey.Q.y.toBigInteger().intValue(), equals(kPublicKeyQy));
+    ECPrivateKey keyPairPrivateKey = keyPair.privateKey;
+    ECPublicKey keyPairPublicKey = keyPair.publicKey;
+    expect(keyPairPrivateKey.d.intValue(), equals(kPrivateKeyD));
+    expect(keyPairPublicKey.Q.x.toBigInteger().intValue(), equals(kPublicKeyQx));
+    expect(keyPairPublicKey.Q.y.toBigInteger().intValue(), equals(kPublicKeyQy));
   });
 
   test('serializeManifest adds key and content-hash', () {
-    AsymmetricKeyPair keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
-    Uint8List manifestBytes = serializeManifest(kManifest, keyPair.publicKey, kTestBytes);
+    AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
+    ECPublicKey keyPairPublicKey = keyPair.publicKey;
+    Uint8List manifestBytes = serializeManifest(kManifest, keyPairPublicKey, kTestBytes);
     Map<String, dynamic> decodedManifest = JSON.decode(UTF8.decode(manifestBytes));
-    String expectedKey = BASE64.encode(keyPair.publicKey.Q.getEncoded());
+    String expectedKey = BASE64.encode(keyPairPublicKey.Q.getEncoded());
     expect(decodedManifest != null, equals(true));
     expect(decodedManifest['name'], equals(kManifest['name']));
     expect(decodedManifest['version'], equals(kManifest['version']));
@@ -62,10 +65,13 @@ Future main() async {
   });
 
   test('signManifest and verifyManifestSignature work', () {
-    AsymmetricKeyPair keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
+    AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
+    ECPrivateKey keyPairPrivateKey = keyPair.privateKey;
+    ECPublicKey keyPairPublicKey = keyPair.publicKey;
     Map<String, dynamic> manifest = JSON.decode(UTF8.decode(
-        serializeManifest(kManifest, keyPair.publicKey, kTestBytes)));
-    Uint8List signatureBytes = signManifest(kTestBytes, keyPair.privateKey);
+      serializeManifest(kManifest, keyPairPublicKey, kTestBytes))
+    );
+    Uint8List signatureBytes = signManifest(kTestBytes, keyPairPrivateKey);
 
     bool verifies = verifyManifestSignature(manifest, kTestBytes, signatureBytes);
     expect(verifies, equals(true));
@@ -79,11 +85,14 @@ Future main() async {
   });
 
   test('signing works with arbitrary key', () {
-    AsymmetricKeyPair keyPair = keyGenerator.generateKeyPair();
-    String failReason = 'offending private key: ${keyPair.privateKey.d}';
+    AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = keyGenerator.generateKeyPair();
+    ECPrivateKey keyPairPrivateKey = keyPair.privateKey;
+    ECPublicKey keyPairPublicKey = keyPair.publicKey;
+    String failReason = 'offending private key: ${keyPairPrivateKey.d}';
     Map<String, dynamic> manifest = JSON.decode(UTF8.decode(
-        serializeManifest(kManifest, keyPair.publicKey, kTestBytes)));
-    Uint8List signatureBytes = signManifest(kTestBytes, keyPair.privateKey);
+      serializeManifest(kManifest, keyPairPublicKey, kTestBytes))
+    );
+    Uint8List signatureBytes = signManifest(kTestBytes, keyPairPrivateKey);
 
     bool verifies = verifyManifestSignature(manifest, kTestBytes, signatureBytes);
     expect(verifies, equals(true), reason: failReason);
@@ -97,17 +106,18 @@ Future main() async {
   });
 
   test('verifyContentHash works', () async {
-    Stream contentStream = new Stream.fromIterable(kTestBytesList);
+    Stream<Uint8List> contentStream = new Stream<Uint8List>.fromIterable(kTestBytesList);
     bool verifies = await verifyContentHash(new BigInteger(kTestHash), contentStream);
     expect(verifies, equals(true));
 
     // Ensure it fails with invalid hash or content.
-    contentStream = new Stream.fromIterable(kTestBytesList);
+    contentStream = new Stream<Uint8List>.fromIterable(kTestBytesList);
     verifies = await verifyContentHash(new BigInteger(0xdeadbeef), contentStream);
     expect(verifies, equals(false));
 
-    Stream badContentStream =
-        new Stream.fromIterable([new Uint8List.fromList(<int>[42])]);
+    Stream<Uint8List> badContentStream = new Stream<Uint8List>.fromIterable(
+      <Uint8List>[new Uint8List.fromList(<int>[42])]
+    );
     verifies = await verifyContentHash(new BigInteger(kTestHash), badContentStream);
     expect(verifies, equals(false));
   });