refactor: initial state

Author: mrnkr

example/lib/main.dart

@@ -11,7 +11,7 @@ Future main() async {
 
   final store = await configureStore<AppState>((builder) {
     builder.withReducer(reducer);
-    builder.withPreloadedState(AppState(status: {}, todos: List.unmodifiable([])));
+    builder.withPreloadedState(AppState.initialState());
 
     if (Config.reduxDevtoolsEnabled) {
       builder.usingDevtools(Config.reduxDevtoolsUrl);

example/lib/modules/app_state.dart

@@ -12,6 +12,10 @@ class AppState {
 
   AppState({this.status, this.todos});
 
-  factory AppState.fromJson(Map<String, dynamic> json) => _$AppStateFromJson(json);
+  factory AppState.initialState() =>
+      AppState(status: Map.unmodifiable({}), todos: List.unmodifiable([]));
+
+  factory AppState.fromJson(Map<String, dynamic> json) =>
+      _$AppStateFromJson(json);
   Map<String, dynamic> toJson() => _$AppStateToJson(this);
 }