diff --git a/example/sa_flutter_app/analysis_options.yaml b/example/sa_flutter_app/analysis_options.yaml
index 0d29021..2597cf5 100644
--- a/example/sa_flutter_app/analysis_options.yaml
+++ b/example/sa_flutter_app/analysis_options.yaml
@@ -23,6 +23,7 @@ linter:
   rules:
     # avoid_print: false  # Uncomment to disable the `avoid_print` rule
     # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+    library_private_types_in_public_api: false
 
 # Additional information about this file can be found at
-# https://dart.dev/guides/language/analysis-options
+# https://dart.dev/guides/language/analysis-options
\ No newline at end of file
diff --git a/example/sa_flutter_app/lib/example/am1.dart b/example/sa_flutter_app/lib/example/am1.dart
index d6947f7..1400d96 100644
--- a/example/sa_flutter_app/lib/example/am1.dart
+++ b/example/sa_flutter_app/lib/example/am1.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MaterialApp(home: Page()));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -15,7 +15,7 @@ class Page extends StatelessWidget {
 }
 
 class MyAnimatedWidget extends StatefulWidget {
-  const MyAnimatedWidget({Key? key}) : super(key: key);
+  const MyAnimatedWidget({super.key});
 
   @override
   _MyAnimatedWidgetState createState() => _MyAnimatedWidgetState();
diff --git a/example/sa_flutter_app/lib/example/am2.dart b/example/sa_flutter_app/lib/example/am2.dart
index 7a72542..9fd3d10 100644
--- a/example/sa_flutter_app/lib/example/am2.dart
+++ b/example/sa_flutter_app/lib/example/am2.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MaterialApp(home: Page()));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -15,7 +15,7 @@ class Page extends StatelessWidget {
 }
 
 class MyAnimatedWidget extends StatefulWidget {
-  const MyAnimatedWidget({Key? key}) : super(key: key);
+  const MyAnimatedWidget({super.key});
 
   @override
   _MyAnimatedWidgetState createState() => _MyAnimatedWidgetState();
diff --git a/example/sa_flutter_app/lib/example/movietween1.dart b/example/sa_flutter_app/lib/example/movietween1.dart
index 96852cd..d7618f1 100644
--- a/example/sa_flutter_app/lib/example/movietween1.dart
+++ b/example/sa_flutter_app/lib/example/movietween1.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/movietween2.dart b/example/sa_flutter_app/lib/example/movietween2.dart
index d8028f9..70775b3 100644
--- a/example/sa_flutter_app/lib/example/movietween2.dart
+++ b/example/sa_flutter_app/lib/example/movietween2.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/movietween3.dart b/example/sa_flutter_app/lib/example/movietween3.dart
index 833c114..e2dc44a 100644
--- a/example/sa_flutter_app/lib/example/movietween3.dart
+++ b/example/sa_flutter_app/lib/example/movietween3.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa1.dart b/example/sa_flutter_app/lib/example/sa1.dart
index 134f485..3d4a397 100644
--- a/example/sa_flutter_app/lib/example/sa1.dart
+++ b/example/sa_flutter_app/lib/example/sa1.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa2.dart b/example/sa_flutter_app/lib/example/sa2.dart
index aa79515..3774c13 100644
--- a/example/sa_flutter_app/lib/example/sa2.dart
+++ b/example/sa_flutter_app/lib/example/sa2.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa3.dart b/example/sa_flutter_app/lib/example/sa3.dart
index 63d290e..cae8758 100644
--- a/example/sa_flutter_app/lib/example/sa3.dart
+++ b/example/sa_flutter_app/lib/example/sa3.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa4.dart b/example/sa_flutter_app/lib/example/sa4.dart
index 86493ce..e65c02e 100644
--- a/example/sa_flutter_app/lib/example/sa4.dart
+++ b/example/sa_flutter_app/lib/example/sa4.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa5.dart b/example/sa_flutter_app/lib/example/sa5.dart
index c3cd233..9445c55 100644
--- a/example/sa_flutter_app/lib/example/sa5.dart
+++ b/example/sa_flutter_app/lib/example/sa5.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa6.dart b/example/sa_flutter_app/lib/example/sa6.dart
index 57cc2e1..9162211 100644
--- a/example/sa_flutter_app/lib/example/sa6.dart
+++ b/example/sa_flutter_app/lib/example/sa6.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa7.dart b/example/sa_flutter_app/lib/example/sa7.dart
index 1867f23..0e592c3 100644
--- a/example/sa_flutter_app/lib/example/sa7.dart
+++ b/example/sa_flutter_app/lib/example/sa7.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatelessWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/example/sa8.dart b/example/sa_flutter_app/lib/example/sa8.dart
index 0ffc4d3..f46eccd 100644
--- a/example/sa_flutter_app/lib/example/sa8.dart
+++ b/example/sa_flutter_app/lib/example/sa8.dart
@@ -5,7 +5,7 @@ void main() =>
     runApp(const MaterialApp(home: Scaffold(body: Center(child: Page()))));
 
 class Page extends StatefulWidget {
-  const Page({Key? key}) : super(key: key);
+  const Page({super.key});
 
   @override
   _PageState createState() => _PageState();
diff --git a/example/sa_flutter_app/lib/main.dart b/example/sa_flutter_app/lib/main.dart
index 65b95e3..8fee69f 100644
--- a/example/sa_flutter_app/lib/main.dart
+++ b/example/sa_flutter_app/lib/main.dart
@@ -6,7 +6,7 @@ void main() {
 }
 
 class MyPage extends StatelessWidget {
-  const MyPage({Key? key}) : super(key: key);
+  const MyPage({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/readme/animation_builder.dart b/example/sa_flutter_app/lib/readme/animation_builder.dart
index 1a5131d..3b880a3 100644
--- a/example/sa_flutter_app/lib/readme/animation_builder.dart
+++ b/example/sa_flutter_app/lib/readme/animation_builder.dart
@@ -4,7 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class ResizeCubeAnimation extends StatelessWidget {
-  const ResizeCubeAnimation({Key? key}) : super(key: key);
+  const ResizeCubeAnimation({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -27,7 +27,7 @@ class ResizeCubeAnimation extends StatelessWidget {
 }
 
 class RotatingBox extends StatelessWidget {
-  const RotatingBox({Key? key}) : super(key: key);
+  const RotatingBox({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -46,7 +46,7 @@ class RotatingBox extends StatelessWidget {
 }
 
 class ColorFadeLoop extends StatelessWidget {
-  const ColorFadeLoop({Key? key}) : super(key: key);
+  const ColorFadeLoop({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/readme/animation_builder/example_control.dart b/example/sa_flutter_app/lib/readme/animation_builder/example_control.dart
index 97af321..249155e 100644
--- a/example/sa_flutter_app/lib/readme/animation_builder/example_control.dart
+++ b/example/sa_flutter_app/lib/readme/animation_builder/example_control.dart
@@ -5,7 +5,7 @@ void main() => runApp(
     const MaterialApp(home: Scaffold(body: Center(child: SwappingButton()))));
 
 class SwappingButton extends StatefulWidget {
-  const SwappingButton({Key? key}) : super(key: key);
+  const SwappingButton({super.key});
 
   @override
   _SwappingButtonState createState() => _SwappingButtonState();
diff --git a/example/sa_flutter_app/lib/readme/animation_builder/example_play_animation.dart b/example/sa_flutter_app/lib/readme/animation_builder/example_play_animation.dart
index b7ac734..b09c402 100644
--- a/example/sa_flutter_app/lib/readme/animation_builder/example_play_animation.dart
+++ b/example/sa_flutter_app/lib/readme/animation_builder/example_play_animation.dart
@@ -5,7 +5,7 @@ void main() => runApp(
     const MaterialApp(home: Scaffold(body: Center(child: AnimatedGreenBox()))));
 
 class AnimatedGreenBox extends StatelessWidget {
-  const AnimatedGreenBox({Key? key}) : super(key: key);
+  const AnimatedGreenBox({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_builder.dart b/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_builder.dart
index 32e7431..6f8764c 100644
--- a/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_builder.dart
+++ b/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_builder.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MaterialApp(home: Scaffold(body: MyPage())));
 
 class MyPage extends StatelessWidget {
-  const MyPage({Key? key}) : super(key: key);
+  const MyPage({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_mixin.dart b/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_mixin.dart
index 5f3b954..ad8ec70 100644
--- a/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_mixin.dart
+++ b/example/sa_flutter_app/lib/readme/animation_developer_tools/animation_mixin.dart
@@ -4,7 +4,7 @@ import 'package:simple_animations/simple_animations.dart';
 void main() => runApp(const MyApp());
 
 class MyApp extends StatelessWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -24,7 +24,7 @@ class MyApp extends StatelessWidget {
 }
 
 class MyAnimation extends StatefulWidget {
-  const MyAnimation({Key? key}) : super(key: key);
+  const MyAnimation({super.key});
 
   @override
   _MyAnimationState createState() => _MyAnimationState();
diff --git a/example/sa_flutter_app/lib/readme/animation_developer_tools/intro.dart b/example/sa_flutter_app/lib/readme/animation_developer_tools/intro.dart
index 7738f62..36eef69 100644
--- a/example/sa_flutter_app/lib/readme/animation_developer_tools/intro.dart
+++ b/example/sa_flutter_app/lib/readme/animation_developer_tools/intro.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyPage extends StatelessWidget {
-  const MyPage({Key? key}) : super(key: key);
+  const MyPage({super.key});
 
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/readme/animation_mixin.dart b/example/sa_flutter_app/lib/readme/animation_mixin.dart
index f6bc569..439b850 100644
--- a/example/sa_flutter_app/lib/readme/animation_mixin.dart
+++ b/example/sa_flutter_app/lib/readme/animation_mixin.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyWidget extends StatefulWidget {
-  const MyWidget({Key? key}) : super(key: key);
+  const MyWidget({super.key});
 
   @override
   _MyWidgetState createState() => _MyWidgetState();
diff --git a/example/sa_flutter_app/lib/readme/animation_mixin/basic.dart b/example/sa_flutter_app/lib/readme/animation_mixin/basic.dart
index d571a09..e4779b1 100644
--- a/example/sa_flutter_app/lib/readme/animation_mixin/basic.dart
+++ b/example/sa_flutter_app/lib/readme/animation_mixin/basic.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyAnimatedWidget extends StatefulWidget {
-  const MyAnimatedWidget({Key? key}) : super(key: key);
+  const MyAnimatedWidget({super.key});
 
   @override
   _MyAnimatedWidgetState createState() => _MyAnimatedWidgetState();
diff --git a/example/sa_flutter_app/lib/readme/animation_mixin/managed1.dart b/example/sa_flutter_app/lib/readme/animation_mixin/managed1.dart
index 9099dde..af608ab 100644
--- a/example/sa_flutter_app/lib/readme/animation_mixin/managed1.dart
+++ b/example/sa_flutter_app/lib/readme/animation_mixin/managed1.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyAnimatedWidget extends StatefulWidget {
-  const MyAnimatedWidget({Key? key}) : super(key: key);
+  const MyAnimatedWidget({super.key});
 
   @override
   _MyAnimatedWidgetState createState() => _MyAnimatedWidgetState();
diff --git a/example/sa_flutter_app/lib/readme/animation_mixin/managed2.dart b/example/sa_flutter_app/lib/readme/animation_mixin/managed2.dart
index 6640160..d3920aa 100644
--- a/example/sa_flutter_app/lib/readme/animation_mixin/managed2.dart
+++ b/example/sa_flutter_app/lib/readme/animation_mixin/managed2.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyAnimatedWidget extends StatefulWidget {
-  const MyAnimatedWidget({Key? key}) : super(key: key);
+  const MyAnimatedWidget({super.key});
 
   @override
   _MyAnimatedWidgetState createState() => _MyAnimatedWidgetState();
diff --git a/example/sa_flutter_app/lib/readme/movie_tween/duration.dart b/example/sa_flutter_app/lib/readme/movie_tween/duration.dart
index 463958c..c1f6636 100644
--- a/example/sa_flutter_app/lib/readme/movie_tween/duration.dart
+++ b/example/sa_flutter_app/lib/readme/movie_tween/duration.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyWidget extends StatelessWidget {
-  const MyWidget({Key? key}) : super(key: key);
+  const MyWidget({super.key});
   // #begin
   @override
   Widget build(BuildContext context) {
diff --git a/example/sa_flutter_app/lib/readme/movie_tween/play_animation_example.dart b/example/sa_flutter_app/lib/readme/movie_tween/play_animation_example.dart
index 2d9c3ed..73ffa22 100644
--- a/example/sa_flutter_app/lib/readme/movie_tween/play_animation_example.dart
+++ b/example/sa_flutter_app/lib/readme/movie_tween/play_animation_example.dart
@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:simple_animations/simple_animations.dart';
 
 class MyWidget extends StatelessWidget {
-  const MyWidget({Key? key}) : super(key: key);
+  const MyWidget({super.key});
 
   // #begin
   @override