Migrate fuchsia sdk and dependencies to null safety (#88920)

packages/flutter_tools/lib/src/fuchsia/fuchsia_dev_finder.dart

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
-import 'package:meta/meta.dart';
+import 'package:file/file.dart';
 import 'package:process/process.dart';
 
 import '../base/common.dart';
@@ -25,16 +23,15 @@ import 'fuchsia_sdk.dart';
 /// A simple wrapper for the Fuchsia SDK's 'device-finder' tool.
 class FuchsiaDevFinder {
   FuchsiaDevFinder({
-    @required FuchsiaArtifacts fuchsiaArtifacts,
-    @required Logger logger,
-    @required ProcessManager processManager,
+    required FuchsiaArtifacts? fuchsiaArtifacts,
+    required Logger logger,
+    required ProcessManager processManager,
   })
     : _fuchsiaArtifacts = fuchsiaArtifacts,
       _logger = logger,
       _processUtils = ProcessUtils(logger: logger, processManager: processManager);
 
-
-  final FuchsiaArtifacts _fuchsiaArtifacts;
+  final FuchsiaArtifacts? _fuchsiaArtifacts;
   final Logger _logger;
   final ProcessUtils _processUtils;
 
@@ -42,13 +39,13 @@ class FuchsiaDevFinder {
   /// formatted as follows:
   ///
   ///     192.168.42.172 scare-cable-skip-joy
-  Future<List<String>> list({ Duration timeout }) async {
-    if (_fuchsiaArtifacts.devFinder == null ||
-        !_fuchsiaArtifacts.devFinder.existsSync()) {
+  Future<List<String>?> list({ Duration? timeout }) async {
+    final File? devFinder = _fuchsiaArtifacts?.devFinder;
+    if (devFinder == null || !devFinder.existsSync()) {
       throwToolExit('Fuchsia device-finder tool not found.');
     }
     final List<String> command = <String>[
-      _fuchsiaArtifacts.devFinder.path,
+      devFinder.path,
       'list',
       '-full',
       if (timeout != null)
@@ -70,13 +67,13 @@ class FuchsiaDevFinder {
   ///
   /// The string [deviceName] should be the name of the device from the
   /// 'list' command, e.g. 'scare-cable-skip-joy'.
-  Future<String> resolve(String deviceName) async {
-    if (_fuchsiaArtifacts.devFinder == null ||
-        !_fuchsiaArtifacts.devFinder.existsSync()) {
+  Future<String?> resolve(String deviceName) async {
+    final File? devFinder = _fuchsiaArtifacts?.devFinder;
+    if (devFinder == null || !devFinder.existsSync()) {
       throwToolExit('Fuchsia device-finder tool not found.');
     }
     final List<String> command = <String>[
-      _fuchsiaArtifacts.devFinder.path,
+      devFinder.path,
       'resolve',
       '-device-limit', '1',
       deviceName,

packages/flutter_tools/lib/src/fuchsia/fuchsia_ffx.dart

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
-import 'package:meta/meta.dart';
+import 'package:file/file.dart';
 import 'package:process/process.dart';
 
 import '../base/common.dart';
@@ -32,15 +30,15 @@ import 'fuchsia_sdk.dart';
 /// A simple wrapper for the Fuchsia SDK's 'ffx' tool.
 class FuchsiaFfx {
   FuchsiaFfx({
-    @required FuchsiaArtifacts fuchsiaArtifacts,
-    @required Logger logger,
-    @required ProcessManager processManager,
+    required FuchsiaArtifacts? fuchsiaArtifacts,
+    required Logger logger,
+    required ProcessManager processManager,
   })  : _fuchsiaArtifacts = fuchsiaArtifacts,
         _logger = logger,
         _processUtils =
             ProcessUtils(logger: logger, processManager: processManager);
 
-  final FuchsiaArtifacts _fuchsiaArtifacts;
+  final FuchsiaArtifacts? _fuchsiaArtifacts;
   final Logger _logger;
   final ProcessUtils _processUtils;
 
@@ -48,12 +46,13 @@ class FuchsiaFfx {
   /// formatted as follows:
   ///
   /// abcd::abcd:abc:abcd:abcd%qemu scare-cable-skip-joy
-  Future<List<String>> list({Duration timeout}) async {
-    if (_fuchsiaArtifacts.ffx == null || !_fuchsiaArtifacts.ffx.existsSync()) {
+  Future<List<String>?> list({Duration? timeout}) async {
+    final File? ffx = _fuchsiaArtifacts?.ffx;
+    if (ffx == null || !ffx.existsSync()) {
       throwToolExit('Fuchsia ffx tool not found.');
     }
     final List<String> command = <String>[
-      _fuchsiaArtifacts.ffx.path,
+      ffx.path,
       if (timeout != null)
         ...<String>['-T', '${timeout.inSeconds}'],
       'target',
@@ -76,12 +75,13 @@ class FuchsiaFfx {
   ///
   /// The string [deviceName] should be the name of the device from the
   /// 'list' command, e.g. 'scare-cable-skip-joy'.
-  Future<String> resolve(String deviceName) async {
-    if (_fuchsiaArtifacts.ffx == null || !_fuchsiaArtifacts.ffx.existsSync()) {
+  Future<String?> resolve(String deviceName) async {
+    final File? ffx = _fuchsiaArtifacts?.ffx;
+    if (ffx == null || !ffx.existsSync()) {
       throwToolExit('Fuchsia ffx tool not found.');
     }
     final List<String> command = <String>[
-      _fuchsiaArtifacts.ffx.path,
+      ffx.path,
       'target',
       'list',
       '--format',

packages/flutter_tools/lib/src/fuchsia/fuchsia_kernel_compiler.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'package:meta/meta.dart';
 
 import '../artifacts.dart';
@@ -21,8 +19,8 @@ class FuchsiaKernelCompiler {
   /// the Flutter tool should make no use of that fact), and a manifest that
   /// refers to them.
   Future<void> build({
-    @required FuchsiaProject fuchsiaProject,
-    @required String target, // E.g., lib/main.dart
+    required FuchsiaProject fuchsiaProject,
+    required String target, // E.g., lib/main.dart
     BuildInfo buildInfo = BuildInfo.debug,
   }) async {
     // TODO(zanderso): Use filesystem root and scheme information from buildInfo.
@@ -33,20 +31,20 @@ class FuchsiaKernelCompiler {
     final String fsRoot = fuchsiaProject.project.directory.path;
     final String relativePackagesFile = globals.fs.path.relative(packagesFile, from: fsRoot);
     final String manifestPath = globals.fs.path.join(outDir, '$appName.dilpmanifest');
-    final String kernelCompiler = globals.artifacts.getArtifactPath(
+    final String? kernelCompiler = globals.artifacts?.getArtifactPath(
       Artifact.fuchsiaKernelCompiler,
       platform: TargetPlatform.fuchsia_arm64,  // This file is not arch-specific.
       mode: buildInfo.mode,
     );
-    if (!globals.fs.isFileSync(kernelCompiler)) {
+    if (kernelCompiler == null || !globals.fs.isFileSync(kernelCompiler)) {
       throwToolExit('Fuchsia kernel compiler not found at "$kernelCompiler"');
     }
-    final String platformDill = globals.artifacts.getArtifactPath(
+    final String? platformDill = globals.artifacts?.getArtifactPath(
       Artifact.platformKernelDill,
       platform: TargetPlatform.fuchsia_arm64,  // This file is not arch-specific.
       mode: buildInfo.mode,
     );
-    if (!globals.fs.isFileSync(platformDill)) {
+    if (platformDill == null || !globals.fs.isFileSync(platformDill)) {
       throwToolExit('Fuchsia platform file not found at "$platformDill"');
     }
     List<String> flags = <String>[
@@ -64,8 +62,12 @@ class FuchsiaKernelCompiler {
       '$multiRootScheme:///$target',
     ];
 
+    final String? engineDartBinaryPath = globals.artifacts?.getHostArtifact(HostArtifact.engineDartBinary).path;
+    if (engineDartBinaryPath == null) {
+      throwToolExit('Engine dart binary not found at "$engineDartBinaryPath"');
+    }
     final List<String> command = <String>[
-      globals.artifacts.getHostArtifact(HostArtifact.engineDartBinary).path,
+      engineDartBinaryPath,
       '--disable-dart-dev',
       kernelCompiler,
       ...flags,
@@ -87,8 +89,8 @@ class FuchsiaKernelCompiler {
   /// Provide flags that are affected by [BuildInfo]
   @visibleForTesting
   static List<String> getBuildInfoFlags({
-    @required BuildInfo buildInfo,
-    @required String manifestPath,
+    required BuildInfo buildInfo,
+    required String manifestPath,
   }) {
     return <String>[
       // AOT/JIT:

packages/flutter_tools/lib/src/fuchsia/fuchsia_pm.dart

@@ -2,15 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import '../base/common.dart';
 import '../base/file_system.dart';
 import '../base/io.dart';
 import '../base/net.dart';
 import '../base/process.dart';
 import '../convert.dart';
-import '../globals.dart' as globals;
+import '../globals_null_migrated.dart' as globals;
 
 import 'fuchsia_sdk.dart';
 
@@ -92,14 +90,15 @@ class FuchsiaPM {
   /// [FuchsiaDevFinder.resolve] or [FuchsiaFfx.resolve] and [port] should be an unused port for the
   /// http server to bind.
   Future<Process> serve(String repoPath, String host, int port) async {
-    if (globals.fuchsiaArtifacts.pm == null) {
+    final File? pm = globals.fuchsiaArtifacts?.pm;
+    if (pm == null) {
       throwToolExit('Fuchsia pm tool not found');
     }
     if (isIPv6Address(host.split('%').first)) {
       host = '[$host]';
     }
     final List<String> command = <String>[
-      globals.fuchsiaArtifacts.pm.path,
+      pm.path,
       'serve',
       '-repo',
       repoPath,
@@ -136,10 +135,11 @@ class FuchsiaPM {
   }
 
   Future<bool> _runPMCommand(List<String> args) async {
-    if (globals.fuchsiaArtifacts.pm == null) {
+    final File? pm = globals.fuchsiaArtifacts?.pm;
+    if (pm == null) {
       throwToolExit('Fuchsia pm tool not found');
     }
-    final List<String> command = <String>[globals.fuchsiaArtifacts.pm.path, ...args];
+    final List<String> command = <String>[pm.path, ...args];
     final RunResult result = await globals.processUtils.run(command);
     return result.exitCode == 0;
   }
@@ -178,7 +178,7 @@ class FuchsiaPackageServer {
   final String _host;
   final int _port;
 
-  Process _process;
+  Process? _process;
 
   // The name used to reference the server by fuchsia-pkg:// urls.
   final String name;
@@ -196,13 +196,14 @@ class FuchsiaPackageServer {
       return false;
     }
     // initialize a new repo.
-    if (!await fuchsiaSdk.fuchsiaPM.newrepo(_repo)) {
+    final FuchsiaPM? fuchsiaPM = fuchsiaSdk?.fuchsiaPM;
+    if (fuchsiaPM == null || !await fuchsiaPM.newrepo(_repo)) {
       globals.printError('Failed to create a new package server repo');
       return false;
     }
-    _process = await fuchsiaSdk.fuchsiaPM.serve(_repo, _host, _port);
+    _process = await fuchsiaPM.serve(_repo, _host, _port);
     // Put a completer on _process.exitCode to watch for error.
-    unawaited(_process.exitCode.whenComplete(() {
+    unawaited(_process?.exitCode.whenComplete(() {
       // If _process is null, then the server was stopped deliberately.
       if (_process != null) {
         globals.printError('Error running Fuchsia pm tool "serve" command');
@@ -214,7 +215,7 @@ class FuchsiaPackageServer {
   /// Forcefully stops the package server process by sending it SIGTERM.
   void stop() {
     if (_process != null) {
-      _process.kill();
+      _process?.kill();
       _process = null;
     }
   }
@@ -228,12 +229,12 @@ class FuchsiaPackageServer {
     if (_process == null) {
       return false;
     }
-    return fuchsiaSdk.fuchsiaPM.publish(_repo, package.path);
+    return (await fuchsiaSdk?.fuchsiaPM.publish(_repo, package.path)) == true;
   }
 
   @override
   String toString() {
-    final String p = (_process == null) ? 'stopped' : 'running ${_process.pid}';
+    final String p = (_process == null) ? 'stopped' : 'running ${_process?.pid}';
     return 'FuchsiaPackageServer at $_host:$_port ($p)';
   }
 }

packages/flutter_tools/lib/src/fuchsia/fuchsia_sdk.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'dart:async';
 
 import '../base/context.dart';
@@ -11,7 +9,7 @@ import '../base/file_system.dart';
 import '../base/io.dart';
 import '../base/platform.dart';
 import '../convert.dart';
-import '../globals.dart' as globals;
+import '../globals_null_migrated.dart' as globals;
 
 import 'fuchsia_dev_finder.dart';
 import 'fuchsia_ffx.dart';
@@ -19,7 +17,7 @@ import 'fuchsia_kernel_compiler.dart';
 import 'fuchsia_pm.dart';
 
 /// The [FuchsiaSdk] instance.
-FuchsiaSdk get fuchsiaSdk => context.get<FuchsiaSdk>();
+FuchsiaSdk? get fuchsiaSdk => context.get<FuchsiaSdk>();
 
 /// Returns [true] if the current platform supports Fuchsia targets.
 bool isFuchsiaSupportedPlatform(Platform platform) {
@@ -32,26 +30,20 @@ bool isFuchsiaSupportedPlatform(Platform platform) {
 /// including a working fx command-line tool in the user's PATH.
 class FuchsiaSdk {
   /// Interface to the 'pm' tool.
-  FuchsiaPM get fuchsiaPM => _fuchsiaPM ??= FuchsiaPM();
-  FuchsiaPM _fuchsiaPM;
+  late final FuchsiaPM fuchsiaPM = FuchsiaPM();
 
   /// Interface to the 'device-finder' tool.
-  FuchsiaDevFinder _fuchsiaDevFinder;
-  FuchsiaDevFinder get fuchsiaDevFinder =>
-      _fuchsiaDevFinder ??= FuchsiaDevFinder(
+  late final FuchsiaDevFinder fuchsiaDevFinder = FuchsiaDevFinder(
         fuchsiaArtifacts: globals.fuchsiaArtifacts,
         logger: globals.logger,
         processManager: globals.processManager
       );
 
   /// Interface to the 'kernel_compiler' tool.
-  FuchsiaKernelCompiler _fuchsiaKernelCompiler;
-  FuchsiaKernelCompiler get fuchsiaKernelCompiler =>
-      _fuchsiaKernelCompiler ??= FuchsiaKernelCompiler();
+  late final FuchsiaKernelCompiler fuchsiaKernelCompiler = FuchsiaKernelCompiler();
 
   /// Interface to the 'ffx' tool.
-  FuchsiaFfx _fuchsiaFfx;
-  FuchsiaFfx get fuchsiaFfx => _fuchsiaFfx ??= FuchsiaFfx(
+  late final FuchsiaFfx fuchsiaFfx = FuchsiaFfx(
     fuchsiaArtifacts: globals.fuchsiaArtifacts,
     logger: globals.logger,
     processManager: globals.processManager,
@@ -60,17 +52,17 @@ class FuchsiaSdk {
   /// Returns any attached devices is a newline-denominated String.
   ///
   /// Example output: abcd::abcd:abc:abcd:abcd%qemu scare-cable-skip-joy
-  Future<String> listDevices({Duration timeout, bool useDeviceFinder = false}) async {
-    List<String> devices;
+  Future<String?> listDevices({Duration? timeout, bool useDeviceFinder = false}) async {
+    List<String>? devices;
     if (useDeviceFinder) {
-      if (globals.fuchsiaArtifacts.devFinder == null ||
-          !globals.fuchsiaArtifacts.devFinder.existsSync()) {
+      final File? devFinder = globals.fuchsiaArtifacts?.devFinder;
+      if (devFinder == null || !devFinder.existsSync()) {
         return null;
       }
       devices = await fuchsiaDevFinder.list(timeout: timeout);
     } else {
-      if (globals.fuchsiaArtifacts.ffx == null ||
-          !globals.fuchsiaArtifacts.ffx.existsSync()) {
+      final File? ffx = globals.fuchsiaArtifacts?.ffx;
+      if (ffx == null || !ffx.existsSync()) {
         return null;
       }
       devices = await fuchsiaFfx.list(timeout: timeout);
@@ -83,14 +75,14 @@ class FuchsiaSdk {
 
   /// Returns the fuchsia system logs for an attached device where
   /// [id] is the IP address of the device.
-  Stream<String> syslogs(String id) {
-    Process process;
+  Stream<String>? syslogs(String id) {
+    Process? process;
     try {
       final StreamController<String> controller = StreamController<String>(onCancel: () {
-        process.kill();
+        process?.kill();
       });
-      if (globals.fuchsiaArtifacts.sshConfig == null ||
-          !globals.fuchsiaArtifacts.sshConfig.existsSync()) {
+      final File? sshConfig = globals.fuchsiaArtifacts?.sshConfig;
+      if (sshConfig == null || !sshConfig.existsSync()) {
         globals.printError('Cannot read device logs: No ssh config.');
         globals.printError('Have you set FUCHSIA_SSH_CONFIG or FUCHSIA_BUILD_DIR?');
         return null;
@@ -99,7 +91,7 @@ class FuchsiaSdk {
       final List<String> cmd = <String>[
         'ssh',
         '-F',
-        globals.fuchsiaArtifacts.sshConfig.absolute.path,
+        sshConfig.absolute.path,
         id, // The device's IP.
         remoteCommand,
       ];
@@ -108,8 +100,8 @@ class FuchsiaSdk {
           return;
         }
         process = newProcess;
-        process.exitCode.whenComplete(controller.close);
-        controller.addStream(process.stdout
+        process?.exitCode.whenComplete(controller.close);
+        controller.addStream(process!.stdout
             .transform(utf8.decoder)
             .transform(const LineSplitter()));
       });
@@ -145,10 +137,10 @@ class FuchsiaArtifacts {
     // If FUCHSIA_BUILD_DIR is defined, then look for the ssh_config dir
     // relative to it. Next, if FUCHSIA_SSH_CONFIG is defined, then use it.
     // TODO(zanderso): Consider passing the ssh config path in with a flag.
-    File sshConfig;
+    File? sshConfig;
     if (globals.platform.environment.containsKey(_kFuchsiaBuildDir)) {
       sshConfig = globals.fs.file(globals.fs.path.join(
-          globals.platform.environment[_kFuchsiaBuildDir], 'ssh-keys', 'ssh_config'));
+          globals.platform.environment[_kFuchsiaBuildDir]!, 'ssh-keys', 'ssh_config'));
     } else if (globals.platform.environment.containsKey(_kFuchsiaSshConfig)) {
       sshConfig = globals.fs.file(globals.platform.environment[_kFuchsiaSshConfig]);
     }
@@ -172,19 +164,19 @@ class FuchsiaArtifacts {
 
   /// The location of the SSH configuration file used to interact with a
   /// Fuchsia device.
-  final File sshConfig;
+  final File? sshConfig;
 
   /// The location of the dev finder tool used to locate connected
   /// Fuchsia devices.
-  final File devFinder;
+  final File? devFinder;
 
   /// The location of the ffx tool used to locate connected
   /// Fuchsia devices.
-  final File ffx;
+  final File? ffx;
 
   /// The pm tool.
-  final File pm;
+  final File? pm;
 
   /// Returns true if the [sshConfig] file is not null and exists.
-  bool get hasSshConfig => sshConfig != null && sshConfig.existsSync();
+  bool get hasSshConfig => sshConfig != null && sshConfig!.existsSync();
 }

packages/flutter_tools/lib/src/fuchsia/fuchsia_workflow.dart

@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
-import 'package:meta/meta.dart';
-
 import '../base/context.dart';
 import '../base/platform.dart';
 import '../doctor_validator.dart';
@@ -13,7 +9,7 @@ import '../features.dart';
 import 'fuchsia_sdk.dart';
 
 /// The [FuchsiaWorkflow] instance.
-FuchsiaWorkflow get fuchsiaWorkflow => context.get<FuchsiaWorkflow>();
+FuchsiaWorkflow? get fuchsiaWorkflow => context.get<FuchsiaWorkflow>();
 
 /// The Fuchsia-specific implementation of a [Workflow].
 ///
@@ -21,9 +17,9 @@ FuchsiaWorkflow get fuchsiaWorkflow => context.get<FuchsiaWorkflow>();
 /// including a working fx command-line tool in the user's PATH.
 class FuchsiaWorkflow implements Workflow {
   FuchsiaWorkflow({
-    @required Platform platform,
-    @required FeatureFlags featureFlags,
-    @required FuchsiaArtifacts fuchsiaArtifacts,
+    required Platform platform,
+    required FeatureFlags featureFlags,
+    required FuchsiaArtifacts fuchsiaArtifacts,
   }) : _platform = platform,
        _featureFlags = featureFlags,
        _fuchsiaArtifacts = fuchsiaArtifacts;
@@ -36,7 +32,7 @@ class FuchsiaWorkflow implements Workflow {
   bool get appliesToHostPlatform => _featureFlags.isFuchsiaEnabled && (_platform.isLinux || _platform.isMacOS);
 
   bool get shouldUseDeviceFinder {
-    final String useDeviceFinder = _platform.environment.containsKey('FUCHSIA_DISABLED_ffx_discovery')
+    final String? useDeviceFinder = _platform.environment.containsKey('FUCHSIA_DISABLED_ffx_discovery')
       ? _platform.environment['FUCHSIA_DISABLED_ffx_discovery'] : '0';
     if (useDeviceFinder == '1') {
       return true;

packages/flutter_tools/lib/src/globals.dart

@@ -7,7 +7,6 @@
 import 'base/context.dart';
 import 'device.dart';
 import 'doctor.dart';
-import 'fuchsia/fuchsia_sdk.dart';
 import 'ios/simulators.dart';
 import 'macos/xcdevice.dart';
 import 'reporting/crash_reporting.dart';
@@ -17,7 +16,6 @@ export 'globals_null_migrated.dart';
 CrashReporter get crashReporter => context.get<CrashReporter>();
 Doctor get doctor => context.get<Doctor>();
 DeviceManager get deviceManager => context.get<DeviceManager>();
-FuchsiaArtifacts get fuchsiaArtifacts => context.get<FuchsiaArtifacts>();
 IOSSimulatorUtils get iosSimulatorUtils => context.get<IOSSimulatorUtils>();
 
 XCDevice get xcdevice => context.get<XCDevice>();

packages/flutter_tools/lib/src/globals_null_migrated.dart

@@ -27,6 +27,7 @@ import 'base/user_messages.dart';
 import 'build_system/build_system.dart';
 import 'cache.dart';
 import 'custom_devices/custom_devices_config.dart';
+import 'fuchsia/fuchsia_sdk.dart';
 import 'ios/ios_workflow.dart';
 import 'ios/plist_parser.dart';
 import 'ios/xcodeproj.dart';
@@ -54,6 +55,7 @@ Signals get signals => context.get<Signals>() ?? LocalSignals.instance;
 AndroidStudio? get androidStudio => context.get<AndroidStudio>();
 AndroidSdk? get androidSdk => context.get<AndroidSdk>();
 FlutterVersion get flutterVersion => context.get<FlutterVersion>()!;
+FuchsiaArtifacts? get fuchsiaArtifacts => context.get<FuchsiaArtifacts>();
 Usage get flutterUsage => context.get<Usage>()!;
 XcodeProjectInterpreter? get xcodeProjectInterpreter => context.get<XcodeProjectInterpreter>();
 Xcode? get xcode => context.get<Xcode>();

packages/flutter_tools/test/general.shard/fuchsia/fuchsia_dev_finder_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'package:file/file.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
@@ -16,10 +14,10 @@ import '../../src/common.dart';
 import '../../src/fake_process_manager.dart';
 
 void main() {
-  FakeFuchsiaArtifacts fuchsiaArtifacts;
-  BufferLogger logger;
-  MemoryFileSystem memoryFileSystem;
-  File deviceFinder;
+  late FakeFuchsiaArtifacts fuchsiaArtifacts;
+  late BufferLogger logger;
+  late MemoryFileSystem memoryFileSystem;
+  late File deviceFinder;
 
   setUp(() {
     fuchsiaArtifacts = FakeFuchsiaArtifacts();
@@ -134,5 +132,5 @@ void main() {
 
 class FakeFuchsiaArtifacts extends Fake implements FuchsiaArtifacts {
   @override
-  File devFinder;
+  File? devFinder;
 }

packages/flutter_tools/test/general.shard/fuchsia/fuchsia_ffx_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'package:file/file.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
@@ -16,10 +14,10 @@ import '../../src/common.dart';
 import '../../src/fake_process_manager.dart';
 
 void main() {
-  FakeFuchsiaArtifacts fakeFuchsiaArtifacts;
-  BufferLogger logger;
-  MemoryFileSystem memoryFileSystem;
-  File ffx;
+  late FakeFuchsiaArtifacts fakeFuchsiaArtifacts;
+  late BufferLogger logger;
+  late MemoryFileSystem memoryFileSystem;
+  late File ffx;
 
   setUp(() {
     fakeFuchsiaArtifacts = FakeFuchsiaArtifacts();
@@ -212,5 +210,5 @@ void main() {
 
 class FakeFuchsiaArtifacts extends Fake implements FuchsiaArtifacts {
   @override
-  File ffx;
+  File? ffx;
 }

packages/flutter_tools/test/general.shard/fuchsia/fuchsia_kernel_compiler_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/fuchsia/fuchsia_kernel_compiler.dart';
 

packages/flutter_tools/test/general.shard/fuchsia/fuchsia_workflow_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/platform.dart';