Revert "Bump lower Dart SDK constraints to 3.0"

ci/bin/format.dart

@@ -304,14 +304,19 @@ abstract class FormatChecker {
 /// Checks and formats C++/ObjC/Shader files using clang-format.
 class ClangFormatChecker extends FormatChecker {
   ClangFormatChecker({
-    super.processManager,
-    required super.baseGitRef,
-    required super.repoDir,
+    ProcessManager processManager = const LocalProcessManager(),
+    required String baseGitRef,
+    required Directory repoDir,
     required Directory srcDir,
-    super.allFiles,
-    super.messageCallback,
+    bool allFiles = false,
+    MessageCallback? messageCallback,
   }) : super(
+          processManager: processManager,
+          baseGitRef: baseGitRef,
+          repoDir: repoDir,
           srcDir: srcDir,
+          allFiles: allFiles,
+          messageCallback: messageCallback,
         ) {
     /*late*/ String clangOs;
     if (Platform.isLinux) {
@@ -444,14 +449,19 @@ class ClangFormatChecker extends FormatChecker {
 /// Checks the format of Java files uing the Google Java format checker.
 class JavaFormatChecker extends FormatChecker {
   JavaFormatChecker({
-    super.processManager,
-    required super.baseGitRef,
-    required super.repoDir,
+    ProcessManager processManager = const LocalProcessManager(),
+    required String baseGitRef,
+    required Directory repoDir,
     required Directory srcDir,
-    super.allFiles,
-    super.messageCallback,
+    bool allFiles = false,
+    MessageCallback? messageCallback,
   }) : super(
+          processManager: processManager,
+          baseGitRef: baseGitRef,
+          repoDir: repoDir,
           srcDir: srcDir,
+          allFiles: allFiles,
+          messageCallback: messageCallback,
         ) {
     googleJavaFormatJar = File(
       path.absolute(
@@ -586,14 +596,19 @@ class JavaFormatChecker extends FormatChecker {
 /// Checks the format of any BUILD.gn files using the "gn format" command.
 class GnFormatChecker extends FormatChecker {
   GnFormatChecker({
-    super.processManager,
-    required super.baseGitRef,
+    ProcessManager processManager = const LocalProcessManager(),
+    required String baseGitRef,
     required Directory repoDir,
-    required super.srcDir,
-    super.allFiles,
-    super.messageCallback,
+    required Directory srcDir,
+    bool allFiles = false,
+    MessageCallback? messageCallback,
   }) : super(
+          processManager: processManager,
+          baseGitRef: baseGitRef,
           repoDir: repoDir,
+          srcDir: srcDir,
+          allFiles: allFiles,
+          messageCallback: messageCallback,
         ) {
     gnBinary = File(
       path.join(
@@ -672,14 +687,19 @@ class GnFormatChecker extends FormatChecker {
 /// Checks the format of any .py files using the "yapf" command.
 class PythonFormatChecker extends FormatChecker {
   PythonFormatChecker({
-    super.processManager,
-    required super.baseGitRef,
+    ProcessManager processManager = const LocalProcessManager(),
+    required String baseGitRef,
     required Directory repoDir,
-    required super.srcDir,
-    super.allFiles,
-    super.messageCallback,
+    required Directory srcDir,
+    bool allFiles = false,
+    MessageCallback? messageCallback,
   }) : super(
+          processManager: processManager,
+          baseGitRef: baseGitRef,
           repoDir: repoDir,
+          srcDir: srcDir,
+          allFiles: allFiles,
+          messageCallback: messageCallback,
         ) {
     yapfBin = File(path.join(
       repoDir.absolute.path,
@@ -767,13 +787,20 @@ class _GrepResult {
 /// Checks for trailing whitspace in Dart files.
 class WhitespaceFormatChecker extends FormatChecker {
   WhitespaceFormatChecker({
-    super.processManager,
-    required super.baseGitRef,
-    required super.repoDir,
-    required super.srcDir,
-    super.allFiles,
-    super.messageCallback,
-  });
+    ProcessManager processManager = const LocalProcessManager(),
+    required String baseGitRef,
+    required Directory repoDir,
+    required Directory srcDir,
+    bool allFiles = false,
+    MessageCallback? messageCallback,
+  }) : super(
+          processManager: processManager,
+          baseGitRef: baseGitRef,
+          repoDir: repoDir,
+          srcDir: srcDir,
+          allFiles: allFiles,
+          messageCallback: messageCallback,
+        );
 
   @override
   Future<bool> checkFormatting() async {

ci/pubspec.yaml

@@ -5,7 +5,7 @@
 name: ci_scripts
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/pkg, //third_party/dart/pkg, or

flutter_frontend_server/pubspec.yaml

@@ -18,7 +18,7 @@ homepage: https://flutter.dev
 # relative to this directory into //third_party/dart
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   args: any

impeller/tessellator/dart/pubspec.yaml

@@ -8,4 +8,4 @@ publish_to: none
 homepage: https://github.com/flutter/impeller/tree/main/tessellator/dart
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'

lib/snapshot/pubspec.yaml

@@ -5,4 +5,4 @@
 # This file is needed by Fuchsia's dart_library template.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'

lib/web_ui/pubspec.yaml

@@ -3,7 +3,7 @@ publish_to: none
 
 # Keep the SDK version range in sync with pubspecs under web_sdk
 environment:
-  sdk: '>=2.19.0 <4.0.0'
+  sdk: ">=2.19.0 <3.0.0"
 
 dependencies:
   js: 0.6.4

shell/platform/fuchsia/dart-pkg/fuchsia/pubspec.yaml

@@ -3,4 +3,4 @@
 # found in the LICENSE file.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'

shell/platform/fuchsia/dart-pkg/zircon/pubspec.yaml

@@ -5,7 +5,7 @@
 name: zircon
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 
 # Uncomment block for local testing

shell/platform/fuchsia/dart-pkg/zircon_ffi/pubspec.yaml

@@ -1,7 +1,7 @@
 name: zircon_ffi
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   ffi: ^1.0.0

shell/platform/fuchsia/dart_runner/embedder/pubspec.yaml

@@ -6,5 +6,5 @@
 # template in BUILD.gn.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 

shell/platform/fuchsia/dart_runner/vmservice/pubspec.yaml

@@ -3,5 +3,5 @@
 # found in the LICENSE file.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 

shell/platform/fuchsia/flutter/kernel/pubspec.yaml

@@ -3,4 +3,4 @@
 # found in the LICENSE file.
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'

shell/platform/fuchsia/flutter/tests/integration/embedder/child-view/pubspec.yaml

@@ -5,4 +5,4 @@
 name: child_view2
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'

shell/platform/fuchsia/flutter/tests/integration/embedder/parent-view/pubspec.yaml

@@ -5,4 +5,4 @@
 name: parent-view2
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.18.0 <3.0.0'

shell/platform/fuchsia/flutter/tests/integration/mouse-input/mouse-input-view/pubspec.yaml

@@ -5,4 +5,4 @@
 name: mouse-input-view
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.18.0 <3.0.0'

shell/platform/fuchsia/flutter/tests/integration/text-input/text-input-view/pubspec.yaml

@@ -5,4 +5,4 @@
 name: text-input-view
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.18.0 <3.0.0'

shell/platform/fuchsia/flutter/tests/integration/touch-input/embedding-flutter-view/pubspec.yaml

@@ -5,4 +5,4 @@
 name: embedding-flutter-view
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.18.0 <3.0.0'

shell/platform/fuchsia/flutter/tests/integration/touch-input/touch-input-view/pubspec.yaml

@@ -5,4 +5,4 @@
 name: touch-input-view
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.18.0 <3.0.0'

shell/platform/fuchsia/runtime/dart/profiler_symbols/pubspec.yaml

@@ -4,7 +4,7 @@
 
 name: profiler_symbols
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 version: 0
 description: Extracts a minimal symbols table for the Dart VM profiler
 author: Dart Team <misc@dartlang.org>

shell/vmservice/pubspec.yaml

@@ -5,4 +5,4 @@
 name: vmservice_snapshot
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'

sky/packages/sky_engine/pubspec.yaml

@@ -5,4 +5,4 @@ description: Dart SDK extensions for dart:ui
 homepage: http://flutter.io
 # sky_engine requires sdk_ext support in the analyzer which was added in 1.11.x
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: ">=2.12.0-0 <3.0.0"

testing/android_background_image/pubspec.yaml

@@ -5,7 +5,7 @@
 name: android_background_image
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/dart/pkg, //third_party/dart/third_party/pkg, or

testing/benchmark/pubspec.yaml

@@ -5,7 +5,7 @@
 name: flutter_engine_benchmark
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/pkg, //third_party/dart/pkg, or

testing/dart/pubspec.yaml

@@ -14,7 +14,7 @@ publish_to: none
 # relative to this directory into //third_party/dart
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 dependencies:
   litetest: any

testing/litetest/pubspec.yaml

@@ -14,7 +14,7 @@ publish_to: none
 # relative to this directory into //third_party/dart
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   async_helper: any

testing/scenario_app/pubspec.yaml

@@ -5,7 +5,7 @@
 name: scenario_app
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/dart/pkg, //third_party/dart/third_party/pkg, or

testing/skia_gold_client/pubspec.yaml

@@ -5,7 +5,7 @@
 name: skia_gold_client
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/dart/pkg, //third_party/dart/third_party/pkg, or

testing/smoke_test_failure/pubspec.yaml

@@ -5,7 +5,7 @@
 name: smoke_test_failure
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/dart/pkg or //third_party/dart/third_party/pkg.

testing/symbols/pubspec.yaml

@@ -5,7 +5,7 @@
 name: verify_exported
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/pkg, //third_party/dart/pkg, or

third_party/web_locale_keymap/pubspec.yaml

@@ -3,7 +3,7 @@ name: web_locale_keymap
 publish_to: none
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: ">=2.12.0 <3.0.0"
 
 dev_dependencies:
   test: ^1.21.7

third_party/web_test_fonts/pubspec.yaml

@@ -3,7 +3,7 @@ name: web_test_fonts
 publish_to: none
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: ">=2.12.0-0 <3.0.0"
 
 dev_dependencies:
   args: any

third_party/web_unicode/pubspec.yaml

@@ -3,7 +3,7 @@ name: web_unicode
 publish_to: none
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: ">=2.12.0-0 <3.0.0"
 
 dev_dependencies:
   args: any

tools/android_lint/pubspec.yaml

@@ -4,7 +4,7 @@
 
 name: android_lint
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party.pkg, //third_party/dart/pkg, or

tools/api_check/pubspec.yaml

@@ -14,7 +14,7 @@ publish_to: none
 # relative to this directory into //third_party/dart
 
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/pkg, //third_party/dart/pkg, or

tools/clang_tidy/pubspec.yaml

@@ -5,7 +5,7 @@
 name: clang_tidy
 publish_to: none
 environment:
-  sdk: '>=3.0.0-0 <4.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
 
 # Do not add any dependencies that require more than what is provided in
 # //third_party/pkg, //third_party/dart/pkg, or