get starter-project branch working with the latest sdk

lib/main.dart

@@ -1,10 +1,12 @@
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(MyApp());
+  runApp(const MyApp());
 }
 
 class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
@@ -21,18 +23,14 @@ class MyApp extends StatelessWidget {
         // Notice that the counter didn't reset back to zero; the application
         // is not restarted.
         primarySwatch: Colors.blue,
-        // This makes the visual density adapt to the platform that you run
-        // the app on. For desktop platforms, the controls will be smaller and
-        // closer together (more dense) than on mobile platforms.
-        visualDensity: VisualDensity.adaptivePlatformDensity,
       ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
+      home: const MyHomePage(title: 'Flutter Demo Home Page'),
     );
   }
 }
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+  const MyHomePage({super.key, required this.title});
 
   // This widget is the home page of your application. It is stateful, meaning
   // that it has a State object (defined below) that contains fields that affect
@@ -46,7 +44,7 @@ class MyHomePage extends StatefulWidget {
   final String title;
 
   @override
-  _MyHomePageState createState() => _MyHomePageState();
+  State<MyHomePage> createState() => _MyHomePageState();
 }
 
 class _MyHomePageState extends State<MyHomePage> {
@@ -97,20 +95,20 @@ class _MyHomePageState extends State<MyHomePage> {
           // horizontal).
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
-            Text(
+            const Text(
               'You have pushed the button this many times:',
             ),
             Text(
               '$_counter',
-              style: Theme.of(context).textTheme.headline4,
+              style: Theme.of(context).textTheme.headlineMedium,
             ),
           ],
         ),
       ),
       floatingActionButton: FloatingActionButton(
         onPressed: _incrementCounter,
         tooltip: 'Increment',
-        child: Icon(Icons.add),
+        child: const Icon(Icons.add),
       ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }

lib/models/post_model.dart

@@ -1,22 +1,21 @@
-import 'package:meta/meta.dart';
 import 'package:flutter_facebook_responsive_ui/models/models.dart';
 
 class Post {
   final User user;
   final String caption;
   final String timeAgo;
-  final String imageUrl;
+  final String? imageUrl;
   final int likes;
   final int comments;
   final int shares;
 
   const Post({
-    @required this.user,
-    @required this.caption,
-    @required this.timeAgo,
-    @required this.imageUrl,
-    @required this.likes,
-    @required this.comments,
-    @required this.shares,
+    required this.user,
+    required this.caption,
+    required this.timeAgo,
+    this.imageUrl,
+    required this.likes,
+    required this.comments,
+    required this.shares,
   });
 }

lib/models/story_model.dart

@@ -1,4 +1,3 @@
-import 'package:meta/meta.dart';
 import 'package:flutter_facebook_responsive_ui/models/models.dart';
 
 class Story {
@@ -7,8 +6,8 @@ class Story {
   final bool isViewed;
 
   const Story({
-    @required this.user,
-    @required this.imageUrl,
+    required this.user,
+    required this.imageUrl,
     this.isViewed = false,
   });
 }

lib/models/user_model.dart

@@ -1,11 +1,9 @@
-import 'package:meta/meta.dart';
-
 class User {
   final String name;
   final String imageUrl;
 
   const User({
-    @required this.name,
-    @required this.imageUrl,
+    required this.name,
+    required this.imageUrl,
   });
 }

pubspec.lock

@@ -7,14 +7,14 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.2"
+    version: "2.9.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   cached_network_image:
     dependency: "direct main"
     description:
@@ -28,7 +28,7 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0"
+    version: "1.2.1"
   charcode:
     dependency: transitive
     description:
@@ -42,14 +42,14 @@ packages:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "1.1.1"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.13"
+    version: "1.16.0"
   convert:
     dependency: transitive
     description:
@@ -77,7 +77,7 @@ packages:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.3.1"
   file:
     dependency: transitive
     description:
@@ -129,7 +129,14 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.8"
+    version: "0.12.12"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.0"
   material_design_icons_flutter:
     dependency: "direct main"
     description:
@@ -143,14 +150,14 @@ packages:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.8.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.2"
   path_provider:
     dependency: transitive
     description:
@@ -225,7 +232,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.9.1"
   sqflite:
     dependency: transitive
     description:
@@ -246,21 +253,21 @@ packages:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.5"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.1"
   synchronized:
     dependency: transitive
     description:
@@ -274,14 +281,14 @@ packages:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.17"
+    version: "0.4.14"
   typed_data:
     dependency: transitive
     description:
@@ -302,7 +309,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.4"
   xdg_directories:
     dependency: transitive
     description:
@@ -311,5 +318,5 @@ packages:
     source: hosted
     version: "0.1.0"
 sdks:
-  dart: ">=2.9.0-14.0.dev <3.0.0"
-  flutter: ">=1.12.13+hotfix.5 <2.0.0"
+  dart: ">=2.19.0-240.0.dev <3.0.0"
+  flutter: ">=1.12.13+hotfix.5"

pubspec.yaml

@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.7.0 <3.0.0'
+  sdk: '>=2.19.0-240.0.dev <3.0.0'
 
 dependencies:
   flutter: