code sharing sample: flat package directory (#1486)

code_sharing/shared/lib/src/models.dart

@@ -0,0 +1,19 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'models.freezed.dart';
+part 'models.g.dart';
+
+@Freezed()
+class Increment with _$Increment {
+  const factory Increment({required int by}) = _Increment;
+
+  factory Increment.fromJson(Map<String, dynamic> json) =>
+      _$IncrementFromJson(json);
+}
+
+@Freezed()
+class Count with _$Count {
+  const factory Count(int value) = _Count;
+
+  factory Count.fromJson(Map<String, dynamic> json) => _$CountFromJson(json);
+}