refactor: use abstract final class for generated classes

examples/example/lib/gen/assets.gen.dart

@@ -220,9 +220,7 @@ class $AssetsLottieWrongGen {
   List<String> get values => [dummy, rocketLottieV439];
 }
 
-class MyAssets {
-  const MyAssets._();
-
+abstract final class MyAssets {
   static const String readme = 'README.md';
   static const $AssetsFlareGen flare = $AssetsFlareGen();
   static const $AssetsImagesGen images = $AssetsImagesGen();

examples/example/lib/gen/colors.gen.dart

@@ -11,9 +11,7 @@
 import 'package:flutter/painting.dart';
 import 'package:flutter/material.dart';
 
-class MyColorName {
-  MyColorName._();
-
+abstract final class MyColorName {
   /// Color: #000000
   static const Color black = Color(0xFF000000);
 

examples/example/lib/gen/fonts.gen.dart

@@ -8,9 +8,7 @@
 // ignore_for_file: type=lint
 // ignore_for_file: deprecated_member_use,directives_ordering,implicit_dynamic_list_literal,unnecessary_import
 
-class MyFontFamily {
-  MyFontFamily._();
-
+abstract final class MyFontFamily {
   /// Font family: Raleway
   static const String raleway = 'Raleway';
 

examples/example_resources/lib/gen/assets.gen.dart

@@ -56,9 +56,7 @@ class $AssetsUnknownGen {
   List<String> get values => [unknownMimeType];
 }
 
-class ResAssets {
-  const ResAssets._();
-
+abstract final class ResAssets {
   static const String package = 'example_resources';
 
   static const $AssetsImagesGen images = $AssetsImagesGen();

examples/example_resources/lib/gen/colors.gen.dart

@@ -11,9 +11,7 @@
 import 'package:flutter/painting.dart';
 import 'package:flutter/material.dart';
 
-class ColorName {
-  ColorName._();
-
+abstract final class ColorName {
   /// Color: #000000
   static const Color black = Color(0xFF000000);
 

examples/example_workspace/packages/gallery_one/lib/gen/assets.gen.dart

@@ -22,9 +22,7 @@ class $AssetsImagesGen {
   List<AssetGenImage> get values => [flutter3];
 }
 
-class GalleryOneAssets {
-  const GalleryOneAssets._();
-
+abstract final class GalleryOneAssets {
   static const $AssetsImagesGen images = $AssetsImagesGen();
 }
 

examples/example_workspace/packages/gallery_two/lib/gen/assets.gen.dart

@@ -19,8 +19,6 @@ class $AssetsImagesGen {
   List<String> get values => [dart];
 }
 
-class GalleryTwoAssets {
-  const GalleryTwoAssets._();
-
+abstract final class GalleryTwoAssets {
   static const $AssetsImagesGen images = $AssetsImagesGen();
 }

melos.yaml

@@ -33,7 +33,11 @@ scripts:
 
   format:
     run: |
-      dart format --set-exit-if-changed .
+      find . -name "*.dart" \
+        -not -path "*/actual_data/*" \
+        -not -path "*/.dart_tool/*" \
+        -not -path "*/build/*" \
+        -print0 | xargs -0 dart format --set-exit-if-changed
       git --no-pager diff --exit-code
     description: Format Dart files and exit if unstaged changes exist
 

packages/core/lib/generators/assets_generator.dart

@@ -592,8 +592,7 @@ String _assetsClassDefinition(
   String? packageName,
 ) {
   return '''
-class $className {
-  const $className._();
+abstract final class $className {
 ${packageName != null ? "\n  static const String package = '$packageName';" : ''}
 
   $statementsBlock

packages/core/lib/generators/colors_generator.dart

@@ -30,8 +30,7 @@ String generateColors(
   buffer.writeln("import 'package:flutter/painting.dart';");
   buffer.writeln("import 'package:flutter/material.dart';");
   buffer.writeln();
-  buffer.writeln('class $className {');
-  buffer.writeln('$className._();');
+  buffer.writeln('abstract final class $className {');
   buffer.writeln();
 
   final colorList = <_Color>[];

packages/core/lib/generators/fonts_generator.dart

@@ -48,8 +48,7 @@ String generateFonts(
   buffer.writeln('// dart format width=${formatter.pageWidth}');
   buffer.writeln(header);
   buffer.writeln(ignore);
-  buffer.writeln('class $className {');
-  buffer.writeln('$className._();');
+  buffer.writeln('abstract final class $className {');
   buffer.writeln();
 
   final isPackage = config.packageParameterLiteral.isNotEmpty;