From b028d2f641eb0401090a8aff96914695030f8d5f Mon Sep 17 00:00:00 2001
From: Elliott Brooks <21270878+elliette@users.noreply.github.com>
Date: Fri, 22 May 2026 10:11:28 -0700
Subject: [PATCH 1/4] Set up gen_defaults package

---
 .../tool/m3e_gen_defaults/README.md           | 24 ++++++
 .../m3e_gen_defaults/analysis_options.yaml    |  4 +
 .../m3e_gen_defaults/bin/gen_defaults.dart    | 28 +++++++
 .../tool/m3e_gen_defaults/pubspec.yaml        | 15 ++++
 .../m3e_gen_defaults/templates/template.dart  | 77 +++++++++++++++++++
 .../test/gen_defaults_test.dart               | 77 +++++++++++++++++++
 .../test/test_fixtures/button_template.dart   | 28 +++++++
 .../test/test_fixtures/button_token_data.dart |  8 ++
 8 files changed, 261 insertions(+)
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/README.md
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/analysis_options.yaml
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart
 create mode 100644 packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart

diff --git a/packages/material_ui/tool/m3e_gen_defaults/README.md b/packages/material_ui/tool/m3e_gen_defaults/README.md
new file mode 100644
index 000000000000..f0d300074fe4
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/README.md
@@ -0,0 +1,24 @@
+## Token Defaults Generator
+
+Script that generates component theme data defaults based on token data.
+
+## Usage
+Run this program from the root of the git repository:
+```sh
+dart packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart [-v]
+```
+
+This updates generated component theming files under
+`packages/material_ui/lib/src/m3e/generated`.
+
+## Templates
+
+There is a template file for every component that needs defaults from the token
+database. These templates are implemented as subclasses of `TokenTemplate`.
+
+Templates need to override the `generateContents` method to provide the
+generated code block as a string.
+
+## Tokens
+
+Tokens are stored in `data/`, and are sourced from an internal Google database.
\ No newline at end of file
diff --git a/packages/material_ui/tool/m3e_gen_defaults/analysis_options.yaml b/packages/material_ui/tool/m3e_gen_defaults/analysis_options.yaml
new file mode 100644
index 000000000000..1fb98de01a0b
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/analysis_options.yaml
@@ -0,0 +1,4 @@
+include: ../../../../analysis_options.yaml
+
+formatter:
+  page_width: 100
diff --git a/packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart b/packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart
new file mode 100644
index 000000000000..42e66881f10a
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart
@@ -0,0 +1,28 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// ## Usage
+//
+// Run from the root of flutter/packages:
+//
+// ```
+// dart packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart [-v]
+// ```
+
+import 'package:args/args.dart';
+
+// TODO(elliette): Import template files.
+// import '../templates/x_template.dart';
+
+Future<void> main(List<String> args) async {
+  // Parse arguments
+  final parser = ArgParser();
+  parser.addFlag('verbose', abbr: 'v', help: 'Enable verbose output', negatable: false);
+  final ArgResults argResults = parser.parse(args);
+  // TODO(elliette): Add token logger when verbose flag is used.
+  // ignore: unused_local_variable
+  final verbose = argResults['verbose'] as bool;
+  // TODO(elliette): Invoke template generators.
+  // const XTemplate().generateFile(verbose: verbose);
+}
diff --git a/packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml b/packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml
new file mode 100644
index 000000000000..2fdde7945bad
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml
@@ -0,0 +1,15 @@
+name: gen_defaults
+description: A command line script to generate Material component defaults from the token database.
+version: 1.0.0
+
+environment:
+  sdk: ^3.10.0-0
+
+resolution: workspace
+
+dependencies:
+  args: any
+
+dev_dependencies:
+  path: any
+  test: any
diff --git a/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart b/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
new file mode 100644
index 000000000000..e0c8a71865e8
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
@@ -0,0 +1,77 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+
+abstract class TokenTemplate {
+  const TokenTemplate();
+
+  /// The name of the template, which corresponds to the target file name.
+  /// E.g., 'typography' for generating 'typography_defaults.g.dart'.
+  String get name;
+
+  static const String copyrightHeader = '''
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+''';
+
+  static const String headerComment = '''
+
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart.
+
+// dart format off
+''';
+
+  static const String footerComment = '''
+// dart format on
+''';
+
+  String generateContents();
+
+  void generateFile({bool verbose = false}) {
+    final fileName = '$materialLib/${name}_defaults.g.dart';
+    if (verbose) {
+      stdout.writeln('Generating file: $fileName');
+      stdout.writeln('Target parent file name: $name.dart');
+    }
+    final file = File(fileName);
+    if (!file.existsSync()) {
+      if (verbose) {
+        stdout.writeln('File does not exist, creating it.');
+      }
+      file.createSync();
+    }
+
+    final parentName = '$name.dart';
+
+    if (verbose) {
+      stdout.writeln('Generating contents...');
+    }
+    final buffer = StringBuffer();
+    buffer.write(copyrightHeader);
+    buffer.write(headerComment);
+    buffer.write("part of '../$parentName';\n\n");
+    buffer.write(generateContents());
+    buffer.write(footerComment);
+
+    if (verbose) {
+      stdout.writeln('Writing generated contents to $fileName...');
+    }
+    file.writeAsStringSync(buffer.toString());
+    if (verbose) {
+      stdout.writeln('Done generating $fileName.');
+    }
+  }
+
+  String get materialLib {
+    const repoPath = 'packages/material_ui/lib/src/generated';
+    if (Directory(repoPath).existsSync()) {
+      return repoPath;
+    }
+    return 'lib/src/generated';
+  }
+}
diff --git a/packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart b/packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart
new file mode 100644
index 000000000000..7451c5e1c4b2
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart
@@ -0,0 +1,77 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:test/test.dart';
+import 'test_fixtures/button_template.dart';
+
+void main() {
+  group('TokenTemplate', () {
+    test(
+      'Templates will generate a part file ending in _defaults.g.dart with correct parent reference',
+      () {
+        final Directory tempDir = Directory.systemTemp.createTempSync('gen_defaults');
+        try {
+          final template = ButtonTemplate(tempDir.path);
+          template.generateFile();
+
+          final file = File('${tempDir.path}/button_defaults.g.dart');
+          expect(file.readAsStringSync(), '''
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart.
+
+// dart format off
+part of '../button.dart';
+
+abstract final class _ButtonDefaults {
+  static const double height = 40.0;
+  static const double borderRadius = 8.0;
+}
+// dart format on
+''');
+        } finally {
+          tempDir.deleteSync(recursive: true);
+        }
+      },
+    );
+
+    test('Templates will completely overwrite any previous code', () {
+      final Directory tempDir = Directory.systemTemp.createTempSync('gen_defaults');
+      try {
+        // Seed the file with pre-existing random text.
+        final file = File('${tempDir.path}/button_defaults.g.dart');
+        file.writeAsStringSync('Pre-existing random text.');
+
+        final templateNew = ButtonTemplate(tempDir.path);
+        templateNew.generateFile();
+        expect(file.readAsStringSync(), '''
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart.
+
+// dart format off
+part of '../button.dart';
+
+abstract final class _ButtonDefaults {
+  static const double height = 40.0;
+  static const double borderRadius = 8.0;
+}
+// dart format on
+''');
+      } finally {
+        tempDir.deleteSync(recursive: true);
+      }
+    });
+  });
+}
diff --git a/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart b/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart
new file mode 100644
index 000000000000..ed5742162c94
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart
@@ -0,0 +1,28 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../../templates/template.dart';
+import 'button_token_data.dart';
+
+class ButtonTemplate extends TokenTemplate {
+  ButtonTemplate(this.customMaterialLib);
+
+  final String customMaterialLib;
+
+  @override
+  String get name => 'button';
+
+  @override
+  String get materialLib => customMaterialLib;
+
+  @override
+  String generateContents() {
+    return '''
+abstract final class _ButtonDefaults {
+  static const double height = ${TokenButton.height};
+  static const double borderRadius = ${TokenButton.borderRadius};
+}
+''';
+  }
+}
diff --git a/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart b/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart
new file mode 100644
index 000000000000..539da016e907
--- /dev/null
+++ b/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart
@@ -0,0 +1,8 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+abstract final class TokenButton {
+  static const double height = 40.0;
+  static const double borderRadius = 8.0;
+}

From 4bf8b1a28a47f5c2a8878225761a04c96aa44d4f Mon Sep 17 00:00:00 2001
From: Elliott Brooks <21270878+elliette@users.noreply.github.com>
Date: Fri, 22 May 2026 10:27:34 -0700
Subject: [PATCH 2/4] Updates based on code assist review

---
 packages/material_ui/pubspec.yaml                     |  1 +
 .../tool/m3e_gen_defaults/templates/template.dart     | 11 ++++++-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/packages/material_ui/pubspec.yaml b/packages/material_ui/pubspec.yaml
index 70489e1f2f61..fab783e33bd1 100644
--- a/packages/material_ui/pubspec.yaml
+++ b/packages/material_ui/pubspec.yaml
@@ -11,6 +11,7 @@ environment:
 
 workspace:
   - example
+  - tool/m3e_gen_defaults
 
 dependencies:
   cupertino_ui:
diff --git a/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart b/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
index e0c8a71865e8..8d4e1fc12df1 100644
--- a/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
+++ b/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
@@ -43,7 +43,7 @@ abstract class TokenTemplate {
       if (verbose) {
         stdout.writeln('File does not exist, creating it.');
       }
-      file.createSync();
+      file.createSync(recursive: true);
     }
 
     final parentName = '$name.dart';
@@ -68,10 +68,11 @@ abstract class TokenTemplate {
   }
 
   String get materialLib {
-    const repoPath = 'packages/material_ui/lib/src/generated';
-    if (Directory(repoPath).existsSync()) {
-      return repoPath;
+    const packagePath = 'packages/material_ui';
+    const relativeOutputPath = 'lib/src/m3e/generated';
+    if (Directory(packagePath).existsSync()) {
+      return '$packagePath/$relativeOutputPath';
     }
-    return 'lib/src/generated';
+    return relativeOutputPath;
   }
 }

From 58f34c369def1c5687975e7b565477d84871f4b7 Mon Sep 17 00:00:00 2001
From: Elliott Brooks <21270878+elliette@users.noreply.github.com>
Date: Tue, 26 May 2026 14:56:39 -0700
Subject: [PATCH 3/4] Respond to PR comments

---
 packages/material_ui/pubspec.yaml             |   2 +-
 .../README.md                                 |   6 +-
 .../analysis_options.yaml                     |   0
 .../bin/gen_defaults.dart                     |   2 +-
 .../pubspec.yaml                              |   1 +
 .../templates/template.dart                   |  77 ++++++++----
 .../gen_defaults/test/gen_defaults_test.dart  | 112 ++++++++++++++++++
 .../test/test_fixtures/button_token_data.dart |   2 +-
 .../test/test_fixtures/test_templates.dart    |  66 +++++++++++
 .../test/gen_defaults_test.dart               |  77 ------------
 .../test/test_fixtures/button_template.dart   |  28 -----
 11 files changed, 240 insertions(+), 133 deletions(-)
 rename packages/material_ui/tool/{m3e_gen_defaults => gen_defaults}/README.md (70%)
 rename packages/material_ui/tool/{m3e_gen_defaults => gen_defaults}/analysis_options.yaml (100%)
 rename packages/material_ui/tool/{m3e_gen_defaults => gen_defaults}/bin/gen_defaults.dart (91%)
 rename packages/material_ui/tool/{m3e_gen_defaults => gen_defaults}/pubspec.yaml (95%)
 rename packages/material_ui/tool/{m3e_gen_defaults => gen_defaults}/templates/template.dart (55%)
 create mode 100644 packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart
 rename packages/material_ui/tool/{m3e_gen_defaults => gen_defaults}/test/test_fixtures/button_token_data.dart (86%)
 create mode 100644 packages/material_ui/tool/gen_defaults/test/test_fixtures/test_templates.dart
 delete mode 100644 packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart
 delete mode 100644 packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart

diff --git a/packages/material_ui/pubspec.yaml b/packages/material_ui/pubspec.yaml
index fab783e33bd1..e3a8b6073409 100644
--- a/packages/material_ui/pubspec.yaml
+++ b/packages/material_ui/pubspec.yaml
@@ -11,7 +11,7 @@ environment:
 
 workspace:
   - example
-  - tool/m3e_gen_defaults
+  - tool/gen_defaults
 
 dependencies:
   cupertino_ui:
diff --git a/packages/material_ui/tool/m3e_gen_defaults/README.md b/packages/material_ui/tool/gen_defaults/README.md
similarity index 70%
rename from packages/material_ui/tool/m3e_gen_defaults/README.md
rename to packages/material_ui/tool/gen_defaults/README.md
index f0d300074fe4..56581126a8ca 100644
--- a/packages/material_ui/tool/m3e_gen_defaults/README.md
+++ b/packages/material_ui/tool/gen_defaults/README.md
@@ -5,16 +5,16 @@ Script that generates component theme data defaults based on token data.
 ## Usage
 Run this program from the root of the git repository:
 ```sh
-dart packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart [-v]
+dart packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart [-v]
 ```
 
 This updates generated component theming files under
-`packages/material_ui/lib/src/m3e/generated`.
+`packages/material_ui/lib/src/generated`.
 
 ## Templates
 
 There is a template file for every component that needs defaults from the token
-database. These templates are implemented as subclasses of `TokenTemplate`.
+database. These templates are implemented as subclasses of either `M3TokenTemplate` or `M3ETokenTemplate`.
 
 Templates need to override the `generateContents` method to provide the
 generated code block as a string.
diff --git a/packages/material_ui/tool/m3e_gen_defaults/analysis_options.yaml b/packages/material_ui/tool/gen_defaults/analysis_options.yaml
similarity index 100%
rename from packages/material_ui/tool/m3e_gen_defaults/analysis_options.yaml
rename to packages/material_ui/tool/gen_defaults/analysis_options.yaml
diff --git a/packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart b/packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart
similarity index 91%
rename from packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart
rename to packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart
index 42e66881f10a..2da295bc4e99 100644
--- a/packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart
+++ b/packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart
@@ -7,7 +7,7 @@
 // Run from the root of flutter/packages:
 //
 // ```
-// dart packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart [-v]
+// dart packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart [-v]
 // ```
 
 import 'package:args/args.dart';
diff --git a/packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml b/packages/material_ui/tool/gen_defaults/pubspec.yaml
similarity index 95%
rename from packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml
rename to packages/material_ui/tool/gen_defaults/pubspec.yaml
index 2fdde7945bad..ab49cbfc4384 100644
--- a/packages/material_ui/tool/m3e_gen_defaults/pubspec.yaml
+++ b/packages/material_ui/tool/gen_defaults/pubspec.yaml
@@ -9,6 +9,7 @@ resolution: workspace
 
 dependencies:
   args: any
+  meta: any
 
 dev_dependencies:
   path: any
diff --git a/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart b/packages/material_ui/tool/gen_defaults/templates/template.dart
similarity index 55%
rename from packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
rename to packages/material_ui/tool/gen_defaults/templates/template.dart
index 8d4e1fc12df1..e10ffca26693 100644
--- a/packages/material_ui/tool/m3e_gen_defaults/templates/template.dart
+++ b/packages/material_ui/tool/gen_defaults/templates/template.dart
@@ -4,12 +4,26 @@
 
 import 'dart:io';
 
-abstract class TokenTemplate {
-  const TokenTemplate();
+import 'package:meta/meta.dart';
 
-  /// The name of the template, which corresponds to the target file name.
-  /// E.g., 'typography' for generating 'typography_defaults.g.dart'.
-  String get name;
+enum _MaterialVersion { material3, material3Expressive }
+
+abstract class M3TokenTemplate extends _TokenTemplate {
+  const M3TokenTemplate();
+
+  @override
+  _MaterialVersion get _version => _MaterialVersion.material3;
+}
+
+abstract class M3ETokenTemplate extends _TokenTemplate {
+  const M3ETokenTemplate();
+
+  @override
+  _MaterialVersion get _version => _MaterialVersion.material3Expressive;
+}
+
+abstract class _TokenTemplate {
+  const _TokenTemplate();
 
   static const String copyrightHeader = '''
 // Copyright 2013 The Flutter Authors
@@ -21,14 +35,29 @@ abstract class TokenTemplate {
 
 // Do not edit by hand. The code is generated from data in the Material
 // Design token database by the script:
-//   packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart.
-
-// dart format off
+//   packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart.
 ''';
 
-  static const String footerComment = '''
-// dart format on
-''';
+  /// The Material version this template is for.
+  _MaterialVersion get _version;
+
+  /// The name of the template, which corresponds to the target file name.
+  /// E.g., 'typography' for generating 'typography_defaults.g.dart'.
+  String get name;
+
+  @visibleForTesting
+  String get materialLib {
+    const packagePath = 'packages/material_ui';
+    const generatedDirectory = 'lib/src/generated';
+    final String relativeOutputPath = switch (_version) {
+      _MaterialVersion.material3 => generatedDirectory,
+      _MaterialVersion.material3Expressive => '$generatedDirectory/material_3_expressive',
+    };
+    if (Directory(packagePath).existsSync()) {
+      return '$packagePath/$relativeOutputPath';
+    }
+    return relativeOutputPath;
+  }
 
   String generateContents();
 
@@ -54,25 +83,29 @@ abstract class TokenTemplate {
     final buffer = StringBuffer();
     buffer.write(copyrightHeader);
     buffer.write(headerComment);
-    buffer.write("part of '../$parentName';\n\n");
+    final String partOfPath = switch (_version) {
+      _MaterialVersion.material3 => '../$parentName',
+      _MaterialVersion.material3Expressive => '../../material_3_expressive/$parentName',
+    };
+    buffer.write("part of '$partOfPath';\n\n");
     buffer.write(generateContents());
-    buffer.write(footerComment);
 
     if (verbose) {
       stdout.writeln('Writing generated contents to $fileName...');
     }
     file.writeAsStringSync(buffer.toString());
     if (verbose) {
-      stdout.writeln('Done generating $fileName.');
+      stdout.writeln('Formatting $fileName...');
     }
-  }
-
-  String get materialLib {
-    const packagePath = 'packages/material_ui';
-    const relativeOutputPath = 'lib/src/m3e/generated';
-    if (Directory(packagePath).existsSync()) {
-      return '$packagePath/$relativeOutputPath';
+    final ProcessResult result = Process.runSync(Platform.resolvedExecutable, <String>[
+      'format',
+      fileName,
+    ]);
+    if (result.exitCode != 0) {
+      stderr.writeln('Failed to format $fileName: ${result.stderr}');
+    }
+    if (verbose) {
+      stdout.writeln('Done generating $fileName.');
     }
-    return relativeOutputPath;
   }
 }
diff --git a/packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart b/packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart
new file mode 100644
index 000000000000..91053fcd959d
--- /dev/null
+++ b/packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart
@@ -0,0 +1,112 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:test/test.dart';
+import 'test_fixtures/test_templates.dart';
+
+void main() {
+  Directory? tempDir;
+  String testPath() => tempDir!.path;
+
+  group('gen_defaults templates', () {
+    setUp(() {
+      tempDir = Directory.systemTemp.createTempSync('gen_defaults');
+    });
+
+    tearDown(() {
+      tempDir!.deleteSync(recursive: true);
+    });
+
+    test('will generate a part file ending in _defaults.g.dart', () {
+      final template = ButtonTemplate(testPath());
+      template.generateFile(verbose: true);
+
+      final file = File('${testPath()}/button_defaults.g.dart');
+      expect(file.existsSync(), isTrue);
+    });
+
+    test('will generate a file with the correct header text', () {
+      final template = ButtonTemplate(testPath());
+      template.generateFile();
+
+      final file = File('${testPath()}/button_defaults.g.dart');
+      final String fileContents = file.readAsStringSync();
+      expect(fileContents, contains(_fileHeader));
+    });
+
+    test('will generate a file with the expected contents', () {
+      final template = ButtonTemplate(testPath());
+      template.generateFile();
+
+      final file = File('${testPath()}/button_defaults.g.dart');
+      final String fileContents = file.readAsStringSync();
+      expect(fileContents, contains(_buttonDefaultsClass));
+    });
+
+    test('will completely overwrite any previous code', () {
+      final file = File('${testPath()}/button_defaults.g.dart');
+      const randomText = 'Pre-existing random text.';
+      file.writeAsStringSync(randomText);
+
+      final template = ButtonTemplate(testPath());
+      template.generateFile();
+      final String fileContents = file.readAsStringSync();
+      expect(fileContents, isNot(contains(randomText)));
+      expect(fileContents, contains(_buttonDefaultsClass));
+    });
+
+    test('will run dart format over the generated file', () {
+      final template = UnformattedTemplate(testPath());
+      template.generateFile();
+
+      final file = File('${testPath()}/unformatted_defaults.g.dart');
+      expect(file.readAsStringSync(), contains(formattedClass));
+    });
+
+    test('materialLib path resolves correctly based on MaterialVersion', () {
+      final m3Template = TestM3Template();
+      final m3ExpressiveTemplate = TestM3ExpressiveTemplate();
+      const materialUiDir = 'packages/material_ui';
+      const generatedDir = 'lib/src/generated';
+
+      final bool hasPackageDir = Directory(materialUiDir).existsSync();
+      if (hasPackageDir) {
+        expect(m3Template.materialLib, '$materialUiDir/$generatedDir');
+        expect(
+          m3ExpressiveTemplate.materialLib,
+          '$materialUiDir/$generatedDir/material_3_expressive',
+        );
+      } else {
+        expect(m3Template.materialLib, generatedDir);
+        expect(m3ExpressiveTemplate.materialLib, '$generatedDir/material_3_expressive');
+      }
+    });
+  });
+}
+
+const _fileHeader = '''
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart.
+''';
+
+const _buttonDefaultsClass = '''
+class _ButtonDefaults {
+  static const double height = 40.0;
+  static const double borderRadius = 8.0;
+}
+''';
+
+const formattedClass = '''
+class UnformattedClass {
+  final int x = 1;
+  final String y = 'hello';
+}
+''';
diff --git a/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart b/packages/material_ui/tool/gen_defaults/test/test_fixtures/button_token_data.dart
similarity index 86%
rename from packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart
rename to packages/material_ui/tool/gen_defaults/test/test_fixtures/button_token_data.dart
index 539da016e907..dbebb961a1e7 100644
--- a/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_token_data.dart
+++ b/packages/material_ui/tool/gen_defaults/test/test_fixtures/button_token_data.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.
 
-abstract final class TokenButton {
+class TokenButton {
   static const double height = 40.0;
   static const double borderRadius = 8.0;
 }
diff --git a/packages/material_ui/tool/gen_defaults/test/test_fixtures/test_templates.dart b/packages/material_ui/tool/gen_defaults/test/test_fixtures/test_templates.dart
new file mode 100644
index 000000000000..e56d0c8ef85d
--- /dev/null
+++ b/packages/material_ui/tool/gen_defaults/test/test_fixtures/test_templates.dart
@@ -0,0 +1,66 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../../templates/template.dart';
+import 'button_token_data.dart';
+
+class ButtonTemplate extends M3ETokenTemplate {
+  ButtonTemplate(this.customMaterialLib);
+
+  final String customMaterialLib;
+
+  @override
+  String get name => 'button';
+
+  @override
+  String get materialLib => customMaterialLib;
+
+  @override
+  String generateContents() {
+    return '''
+class _ButtonDefaults {
+  static const double height = ${TokenButton.height};
+  static const double borderRadius = ${TokenButton.borderRadius};
+}
+''';
+  }
+}
+
+class UnformattedTemplate extends M3TokenTemplate {
+  UnformattedTemplate(this.customMaterialLib);
+
+  final String customMaterialLib;
+
+  @override
+  String get name => 'unformatted';
+
+  @override
+  String get materialLib => customMaterialLib;
+
+  @override
+  String generateContents() {
+    return '''
+class   UnformattedClass   {
+final    int    x = 1  ;
+  final String y   =   'hello' ;
+}
+''';
+  }
+}
+
+class TestM3Template extends M3TokenTemplate {
+  @override
+  String get name => 'm3';
+
+  @override
+  String generateContents() => '';
+}
+
+class TestM3ExpressiveTemplate extends M3ETokenTemplate {
+  @override
+  String get name => 'm3e';
+
+  @override
+  String generateContents() => '';
+}
diff --git a/packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart b/packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart
deleted file mode 100644
index 7451c5e1c4b2..000000000000
--- a/packages/material_ui/tool/m3e_gen_defaults/test/gen_defaults_test.dart
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2013 The Flutter Authors
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'dart:io';
-
-import 'package:test/test.dart';
-import 'test_fixtures/button_template.dart';
-
-void main() {
-  group('TokenTemplate', () {
-    test(
-      'Templates will generate a part file ending in _defaults.g.dart with correct parent reference',
-      () {
-        final Directory tempDir = Directory.systemTemp.createTempSync('gen_defaults');
-        try {
-          final template = ButtonTemplate(tempDir.path);
-          template.generateFile();
-
-          final file = File('${tempDir.path}/button_defaults.g.dart');
-          expect(file.readAsStringSync(), '''
-// Copyright 2013 The Flutter Authors
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Do not edit by hand. The code is generated from data in the Material
-// Design token database by the script:
-//   packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart.
-
-// dart format off
-part of '../button.dart';
-
-abstract final class _ButtonDefaults {
-  static const double height = 40.0;
-  static const double borderRadius = 8.0;
-}
-// dart format on
-''');
-        } finally {
-          tempDir.deleteSync(recursive: true);
-        }
-      },
-    );
-
-    test('Templates will completely overwrite any previous code', () {
-      final Directory tempDir = Directory.systemTemp.createTempSync('gen_defaults');
-      try {
-        // Seed the file with pre-existing random text.
-        final file = File('${tempDir.path}/button_defaults.g.dart');
-        file.writeAsStringSync('Pre-existing random text.');
-
-        final templateNew = ButtonTemplate(tempDir.path);
-        templateNew.generateFile();
-        expect(file.readAsStringSync(), '''
-// Copyright 2013 The Flutter Authors
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Do not edit by hand. The code is generated from data in the Material
-// Design token database by the script:
-//   packages/material_ui/tool/m3e_gen_defaults/bin/gen_defaults.dart.
-
-// dart format off
-part of '../button.dart';
-
-abstract final class _ButtonDefaults {
-  static const double height = 40.0;
-  static const double borderRadius = 8.0;
-}
-// dart format on
-''');
-      } finally {
-        tempDir.deleteSync(recursive: true);
-      }
-    });
-  });
-}
diff --git a/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart b/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart
deleted file mode 100644
index ed5742162c94..000000000000
--- a/packages/material_ui/tool/m3e_gen_defaults/test/test_fixtures/button_template.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2013 The Flutter Authors
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import '../../templates/template.dart';
-import 'button_token_data.dart';
-
-class ButtonTemplate extends TokenTemplate {
-  ButtonTemplate(this.customMaterialLib);
-
-  final String customMaterialLib;
-
-  @override
-  String get name => 'button';
-
-  @override
-  String get materialLib => customMaterialLib;
-
-  @override
-  String generateContents() {
-    return '''
-abstract final class _ButtonDefaults {
-  static const double height = ${TokenButton.height};
-  static const double borderRadius = ${TokenButton.borderRadius};
-}
-''';
-  }
-}

From 5514450bb6eada99b0fe79ac7f9c0dd8b02d6399 Mon Sep 17 00:00:00 2001
From: Elliott Brooks <21270878+elliette@users.noreply.github.com>
Date: Tue, 26 May 2026 14:58:27 -0700
Subject: [PATCH 4/4] Set publish_to: none

---
 packages/material_ui/tool/gen_defaults/pubspec.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/material_ui/tool/gen_defaults/pubspec.yaml b/packages/material_ui/tool/gen_defaults/pubspec.yaml
index ab49cbfc4384..6ab022d87c3d 100644
--- a/packages/material_ui/tool/gen_defaults/pubspec.yaml
+++ b/packages/material_ui/tool/gen_defaults/pubspec.yaml
@@ -1,5 +1,6 @@
 name: gen_defaults
 description: A command line script to generate Material component defaults from the token database.
+publish_to: none
 version: 1.0.0
 
 environment: