Integration Layer
Intent
Implement external integrations (Firebase, Data Connect, HTTP, SDKs) behind stable ports so the rest of the app stays framework-agnostic.
Layer Boundaries
- Only integration/infrastructure may import Firebase/AngularFire/DataConnect SDKs.
- Expose interfaces/tokens to Application; never expose platform types.
Repository Adapters
- Implement repository ports with minimal mapping:
- DTO <-> Domain mapping happens here (or in dedicated mappers within integration). - Keep mapping deterministic; normalize timestamps/IDs.
Streams and Signals
- Integration may return Observables (streaming) or Promises (commands).
- Convert to signals at the Application boundary (store/facade), not in templates.
- Ensure cleanup: avoid manual subscriptions unless lifecycle-bound.
Data Connect
- Treat generated SDK as read-only output.
- After schema changes, regenerate before app code changes.
- Enforce auth directives and least-privilege queries.
Security
- Never trust client input.
- Keep secrets in env/secret manager, not in source.
- Avoid string-concatenated queries; use parameterized APIs.