Migrate to null-safety

bin/templates/platformconstants.dart.dart

@@ -1,5 +1,4 @@
-String getPrefix(Object str) =>
-    ((str as String).length > 26) ? '\n      ' : ' ';
+String getPrefix(String str) => (str.length > 26) ? '\n      ' : ' ';
 
 String $(Map<String, dynamic> c) => '''
 // ignore_for_file: public_member_api_docs
@@ -10,7 +9,7 @@ ${c['types'].map((_) => "  static const int ${_['name']} ="
 }
 
 class PlatformMethod {
-${c['methods'].map((_) => "  static const String ${_['name']} =${getPrefix(_['value'])}'${_['value']}';").join('\n')}
+${c['methods'].map((_) => "  static const String ${_['name']} =${getPrefix(_['value'] as String)}'${_['value']}';").join('\n')}
 }
 
 ${c['objects'].map((_) => '''

example/lib/nested_realtime_events.dart

@@ -21,7 +21,7 @@ void listenRealtimeConnection(ably.Realtime realtime) {
 
   //DISPOSE ON CONNECTED
   final stream = realtime.connection.on();
-  StreamSubscription omegaSubscription;
+  late StreamSubscription omegaSubscription;
   omegaSubscription = stream.listen((stateChange) async {
     print('DISPOSABLE LISTENER ω :: Change event arrived!:'
         ' ${stateChange.event}');
@@ -45,7 +45,7 @@ void listenRealtimeConnection(ably.Realtime realtime) {
   });
 
   StreamSubscription preZetaSubscription;
-  StreamSubscription postZetaSubscription;
+  late StreamSubscription postZetaSubscription;
   preZetaSubscription = realtime.connection.on().listen((stateChange) {
     //This listener "pre ζ" will be cancelled from γ
     print('NESTED LISTENER "pre ζ": ${stateChange.event}');

example/lib/provisioning.dart

@@ -54,7 +54,7 @@ class AppKey {
 
 Future<Map> _provisionApp(
   final String environmentPrefix, [
-  Map<String, List> appSpec,
+  Map<String, List>? appSpec,
 ]) async {
   appSpec ??= _appSpec;
   final url = 'https://${environmentPrefix}rest.ably.io/apps';
@@ -74,7 +74,7 @@ Future<Map> _provisionApp(
 
 Future<AppKey> provision(
   String environmentPrefix, [
-  Map<String, List> appSpec,
+  Map<String, List>? appSpec,
 ]) async {
   final result = await const RetryOptions(
     maxAttempts: 5,

example/pubspec.lock

@@ -108,14 +108,14 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.11.0"
+    version: "1.11.1"
   retry:
     dependency: "direct main"
     description:
       name: retry
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "3.1.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -179,4 +179,4 @@ packages:
     version: "2.1.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"
-  flutter: ">=1.17.0"
+  flutter: ">=2.2.2"

example/pubspec.yaml

@@ -3,14 +3,14 @@ description: Demonstrates how to use the Ably Flutter plugin.
 publish_to: 'none'
 
 environment:
-  sdk: ">=2.6.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
 
   http: ^0.13.3
-  retry: ^3.0.1
+  retry: ^3.1.0
 
 dev_dependencies:
   ably_flutter:
@@ -19,7 +19,7 @@ dev_dependencies:
     sdk: flutter
 
   # Stricter Linting
-  pedantic: ^1.0.0
+  pedantic: ^1.11.1
 
 flutter:
   uses-material-design: true

example/test/widget_test.dart

@@ -17,7 +17,7 @@ void main() {
     // Verify that platform version is retrieved.
     expect(
       find.byWidgetPredicate(
-        (widget) => widget is Text && widget.data.startsWith('Running on:'),
+        (widget) => widget is Text && widget.data!.startsWith('Running on:'),
       ),
       findsOneWidget,
     );