Migrate startup_namer to null-safety

flutter_ci_script_beta.sh

@@ -25,6 +25,7 @@ declare -a CODELABS=(
   "github-graphql-client"
   "google-maps-in-flutter"
   "startup_namer"
+  "startup_namer_null_safety"
   # Tracking issue: https://github.com/flutter/flutter/issues/74209
   # "testing_codelab"
   )

flutter_ci_script_dev.sh

@@ -25,6 +25,7 @@ declare -a CODELABS=(
   "github-graphql-client"
   "google-maps-in-flutter"
   "startup_namer"
+  "startup_namer_null_safety"
   # Tracking issue: https://github.com/flutter/flutter/issues/74209
   # "testing_codelab"
   )

flutter_ci_script_stable.sh

@@ -26,6 +26,8 @@ declare -a CODELABS=(
   "github-graphql-client"
   "google-maps-in-flutter"
   "startup_namer"
+  # TODO(domesticmouse): uncomment when null safety goes stable
+  # "startup_namer_null_safety"
   "testing_codelab"
   )
 

startup_namer_null_safety/README.md

@@ -0,0 +1,11 @@
+This example is used by three codelabs.
+
+Folders 1 through 4:
+
+- https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1
+- https://flutter.io/docs/get-started/codelab
+
+Folders 5 through 8:
+
+- https://codelabs.developers.google.com/codelabs/first-flutter-app-pt2
+(This codelab doesn't live on flutter.dev.)

startup_namer_null_safety/step1_base/analysis_options.yaml

@@ -0,0 +1 @@
+include: package:pedantic/analysis_options.yaml

startup_namer_null_safety/step1_base/lib/main.dart

@@ -0,0 +1,24 @@
+// Copyright 2018 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Welcome to Flutter',
+      home: Scaffold(
+        appBar: AppBar(
+          title: Text('Welcome to Flutter'),
+        ),
+        body: Center(
+          child: Text('Hello World'),
+        ),
+      ),
+    );
+  }
+}