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Meshtastic-Android/conductor/archive/extract_viewmodels_20260316/spec.md

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Specification: Extract Remaining App-Only ViewModels

Overview

This track aims to migrate the final 5 ViewModels currently trapped in the app module to their respective KMP feature:* or core:* modules. These ViewModels contain business logic that should be shared across platforms, but are currently coupled to Android-specific APIs.

Functional Requirements

  • Isolate Dependencies: Identify and abstract Android-specific APIs using a hybrid approach (expect/actual for low-level types and injected interfaces for services).
  • Relocate ViewModels: Move the core logic of these ViewModels to commonMain in the target modules:
    • SettingsViewModel & RadioConfigViewModel -> feature:settings
    • DebugViewModel -> feature:settings
    • MetricsViewModel -> feature:node
    • UIViewModel logic -> core:ui
  • Dependency Injection: Update Koin modules to provide platform-specific implementations of the abstracted interfaces.
  • Maintain Parity: Ensure existing functionality is preserved on Android while enabling these features on Desktop.

Acceptance Criteria

  • All 5 ViewModels are extracted from the app module and logic resides in commonMain.
  • commonTest coverage is established for the shared logic in each respective module.
  • The app module file count is further reduced.
  • Desktop target can instantiate and use the shared ViewModels.