Starter Shape

Use this shape for a real small app. It keeps the first version understandable without trapping you in one giant main.dart.

lib/
  main.dart
  app.dart
  routing.dart
  features/
    notes/
      notes_view.dart
      notes_view_model.dart
      notes_repository.dart
      note.dart
  services/
    local_store.dart
test/
  features/
    notes/
      notes_view_model_test.dart
      notes_view_test.dart
integration_test/
  app_smoke_test.dart
android/
ios/
web/

What Each File Is For

File	Purpose
`main.dart`	Entry point only
`app.dart`	`MaterialApp` or `CupertinoApp`, theme, top-level providers if any
`routing.dart`	Named routes or `go_router` setup when needed
`*_view.dart`	Widget composition and simple layout branching
`*_view_model.dart`	UI state, commands, orchestration
`*_repository.dart`	Data source abstraction and local/network/plugin access coordination
`services/`	Storage, network, platform APIs, files, plugins

What To Exclude From V1

Separate packages for every layer.
Generated dependency injection.
A domain layer with pass-through use cases.
A state-management package before state crosses feature boundaries.
Flavors, CI release lanes, and store automation before the first manual release is understood.

Tip: Add complexity only when a test, feature, or platform target needs it.