[flutter_tools] opt all flutter tool libraries and tests out of null safety. (#74832)

* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more

packages/flutter_tools/bin/flutter_tools.dart

@@ -2,6 +2,8 @@
 // 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/executable.dart' as executable;
 
 void main(List<String> args) {

packages/flutter_tools/bin/fuchsia_asset_builder.dart

@@ -2,6 +2,8 @@
 // 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:args/args.dart';
 import 'package:flutter_tools/src/asset.dart' hide defaultManifestPath;
 import 'package:flutter_tools/src/base/context.dart';

packages/flutter_tools/bin/fuchsia_attach.dart

@@ -2,6 +2,8 @@
 // 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:args/args.dart';
 
 import 'package:flutter_tools/runner.dart' as runner;

packages/flutter_tools/bin/fuchsia_tester.dart

@@ -2,6 +2,8 @@
 // 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:convert' show json;
 import 'dart:math' as math;
 

packages/flutter_tools/bin/tool_backend.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.9
+// @dart = 2.8
 
 // Do not add package imports to this file.
 import 'dart:convert'; // ignore: dart_convert_import.

packages/flutter_tools/lib/executable.dart

@@ -2,6 +2,8 @@
 // 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 'runner.dart' as runner;

packages/flutter_tools/lib/runner.dart

@@ -2,6 +2,8 @@
 // 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 'package:args/command_runner.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 final RegExp _whitespace = RegExp(r'\s+');
 
 /// Convert adb device names into more human readable descriptions.

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 const int minApiLevel = 16;
 const String minVersionName = 'Jelly Bean';
 const String minVersionText = '4.1.x';

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

@@ -2,6 +2,8 @@
 // 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 '../android/gradle_errors.dart';

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

@@ -2,6 +2,8 @@
 // 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:async/async.dart';
 import '../base/io.dart';
 import '../convert.dart';

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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/common.dart';

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

@@ -2,6 +2,8 @@
 // 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/context.dart';
 import '../base/file_system.dart';
 import '../base/io.dart';

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

@@ -2,6 +2,8 @@
 // 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/config.dart';

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

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 

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

@@ -2,6 +2,8 @@
 // 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 '../build_info.dart';
 

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

@@ -2,6 +2,8 @@
 // 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:crypto/crypto.dart';
 import 'package:meta/meta.dart';
 import 'package:xml/xml.dart';

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

@@ -2,6 +2,8 @@
 // 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/error_handling_io.dart';

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

@@ -2,6 +2,8 @@
 // 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/common.dart';

packages/flutter_tools/lib/src/application_package.dart

@@ -2,6 +2,8 @@
 // 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:collection';
 
 import 'package:meta/meta.dart';

packages/flutter_tools/lib/src/artifacts.dart

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 

packages/flutter_tools/lib/src/asset.dart

@@ -2,6 +2,8 @@
 // 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:package_config/package_config.dart';
 

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

@@ -2,6 +2,8 @@
 // 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:archive/archive.dart';
 import 'package:archive/archive_io.dart';
 import 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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';
 
 /// Runs [fn] with special handling of asynchronous errors.

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 

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

@@ -2,6 +2,8 @@
 // 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:math' as math;
 
 import 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 /// Throw a specialized exception for expected situations
 /// where the tool should exit with a clear message to the user
 /// and no stack trace unless the --verbose option is specified.

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

@@ -2,6 +2,8 @@
 // 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 '../convert.dart';

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

@@ -2,6 +2,8 @@
 // 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 'dart:collection';
 

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

@@ -2,6 +2,8 @@
 // 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 'package:dds/dds.dart' as dds;

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

@@ -2,6 +2,8 @@
 // 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:convert';
 import 'dart:io' as io show Directory, File, Link, ProcessException, ProcessResult, ProcessSignal, systemEncoding, Process, ProcessStartMode;
 import 'dart:typed_data';

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

@@ -2,6 +2,8 @@
 // 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/local.dart' as local_fs;
 import 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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:crypto/crypto.dart' show md5;
 import 'package:meta/meta.dart';
 

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 /// This file serves as the single point of entry into the `dart:io` APIs
 /// within Flutter tools.
 ///

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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:archive/archive.dart';
 import 'package:file/file.dart';
 import 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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:io' as io show Platform, stdin, stdout;
 
 /// Provides API parity with the `Platform` class in `dart:io`, but using

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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 'file_system.dart';

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 /// An indirection around our mustache templating system to avoid a
 /// dependency on mustache..
 abstract class TemplateRenderer {

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

@@ -2,6 +2,8 @@
 // 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 '../convert.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 /// A class for making time based operations testable.
 class SystemClock {
   /// A const constructor to allow subclasses to be const.

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

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

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

@@ -2,6 +2,8 @@
 // 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 'dart:math' as math;
 

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

@@ -2,6 +2,8 @@
 // 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';
 
 @immutable

packages/flutter_tools/lib/src/build_info.dart

@@ -2,6 +2,8 @@
 // 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:package_config/package_config_types.dart';
 

packages/flutter_tools/lib/src/build_system/build_system.dart

@@ -2,6 +2,8 @@
 // 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:async/async.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';

packages/flutter_tools/lib/src/build_system/depfile.dart

@@ -2,6 +2,8 @@
 // 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/error_handling_io.dart';

packages/flutter_tools/lib/src/build_system/exceptions.dart

@@ -2,6 +2,8 @@
 // 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/file_system.dart';
 
 import 'build_system.dart';

packages/flutter_tools/lib/src/build_system/file_store.dart

@@ -2,6 +2,8 @@
 // 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:collection';
 import 'dart:typed_data';
 

packages/flutter_tools/lib/src/build_system/hash.dart

@@ -2,6 +2,8 @@
 // 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:typed_data';
 
 /// Data from a non-linear mathematical function that functions as

packages/flutter_tools/lib/src/build_system/source.dart

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

packages/flutter_tools/lib/src/build_system/targets/android.dart

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

packages/flutter_tools/lib/src/build_system/targets/assets.dart

@@ -2,6 +2,8 @@
 // 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:pool/pool.dart';
 

packages/flutter_tools/lib/src/build_system/targets/common.dart

@@ -2,6 +2,8 @@
 // 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:package_config/package_config.dart';
 
 import '../../artifacts.dart';

packages/flutter_tools/lib/src/build_system/targets/desktop.dart

@@ -2,6 +2,8 @@
 // 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/file_system.dart';

packages/flutter_tools/lib/src/build_system/targets/icon_tree_shaker.dart

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 import 'package:mime/mime.dart' as mime;

packages/flutter_tools/lib/src/build_system/targets/ios.dart

@@ -2,6 +2,8 @@
 // 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';

packages/flutter_tools/lib/src/build_system/targets/linux.dart

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

packages/flutter_tools/lib/src/build_system/targets/localizations.dart

@@ -2,6 +2,8 @@
 // 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/file_system.dart';
 import '../../convert.dart';
 import '../../globals.dart' as globals;

packages/flutter_tools/lib/src/build_system/targets/macos.dart

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

packages/flutter_tools/lib/src/build_system/targets/web.dart

@@ -2,6 +2,8 @@
 // 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:math';
 
 import 'package:crypto/crypto.dart';

packages/flutter_tools/lib/src/build_system/targets/windows.dart

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

packages/flutter_tools/lib/src/bundle.dart

@@ -2,6 +2,8 @@
 // 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:convert/convert.dart';
 import 'package:crypto/crypto.dart';
 import 'package:meta/meta.dart';

packages/flutter_tools/lib/src/cache.dart

@@ -2,6 +2,8 @@
 // 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 'package:crypto/crypto.dart';

packages/flutter_tools/lib/src/cmake.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 import 'project.dart';
 
 /// Extracts the `BINARY_NAME` from a project's CMake file.

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

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 

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

@@ -2,6 +2,8 @@
 // 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:args/args.dart';
 import 'package:meta/meta.dart';
 import 'package:process/process.dart';

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

@@ -2,6 +2,8 @@
 // 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:args/args.dart';
 import 'package:meta/meta.dart';
 import 'package:process/process.dart';

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

@@ -2,6 +2,8 @@
 // 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 'package:args/args.dart';

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

@@ -2,6 +2,8 @@
 // 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/common.dart';

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';

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

@@ -2,6 +2,8 @@
 // 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 '../build_info.dart';

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

@@ -2,6 +2,8 @@
 // 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 '../android/android_builder.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 import '../android/android_builder.dart';
 import '../android/build_validation.dart';
 import '../android/gradle_utils.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 import '../android/android_builder.dart';
 import '../android/build_validation.dart';
 import '../android/gradle_utils.dart';

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

@@ -2,6 +2,8 @@
 // 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 '../build_info.dart';
 import '../bundle.dart';

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

@@ -2,6 +2,8 @@
 // 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/common.dart';

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

@@ -2,6 +2,8 @@
 // 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:meta/meta.dart';
 

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

@@ -2,6 +2,8 @@
 // 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:meta/meta.dart';
 

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

@@ -2,6 +2,8 @@
 // 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/analyze_size.dart';
 import '../base/common.dart';
 import '../build_info.dart';

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

@@ -2,6 +2,8 @@
 // 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/analyze_size.dart';

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

@@ -2,6 +2,8 @@
 // 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/common.dart';

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

@@ -2,6 +2,8 @@
 // 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/analyze_size.dart';

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

@@ -2,6 +2,8 @@
 // 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 '../cache.dart';
 import '../globals.dart' as globals;

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

@@ -2,6 +2,8 @@
 // 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/file_system.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 import '../android/android_studio.dart';
 import '../base/common.dart';
 import '../convert.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 import '../android/gradle_utils.dart' as gradle;
 import '../base/common.dart';
 import '../base/context.dart';

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

@@ -2,6 +2,8 @@
 // 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:uuid/uuid.dart';
 

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

@@ -2,6 +2,8 @@
 // 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 'package:async/async.dart';

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

@@ -2,6 +2,8 @@
 // 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/utils.dart';
 import '../convert.dart';

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

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.8
+
 import '../android/android_workflow.dart';
 import '../base/common.dart';
 import '../globals.dart' as globals;

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

@@ -2,6 +2,8 @@
 // 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:process/process.dart';
 
 import '../base/common.dart';

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

@@ -2,6 +2,8 @@
 // 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 'package:meta/meta.dart';