init

lib/features/demo/demo_controller.dart

@@ -0,0 +1,29 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+class DemoState {
+  const DemoState({this.count = 0, this.query = ''});
+
+  final int count;
+  final String query;
+
+  DemoState copyWith({int? count, String? query}) {
+    return DemoState(count: count ?? this.count, query: query ?? this.query);
+  }
+}
+
+class DemoController extends Notifier<DemoState> {
+  @override
+  DemoState build() => const DemoState();
+
+  void increment() {
+    state = state.copyWith(count: state.count + 1);
+  }
+
+  void updateQuery(String query) {
+    state = state.copyWith(query: query);
+  }
+}
+
+final demoControllerProvider = NotifierProvider<DemoController, DemoState>(
+  DemoController.new,
+);