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Device APIs and Native Capabilities

Native capability work is where React Native teams discover whether their architecture is disciplined. Device integrations should be wrapped behind stable app-owned interfaces instead of leaking platform specifics throughout feature code.

Typical capability areas​

  • Camera and media library access.
  • Location and geofencing.
  • Push notifications.
  • Secure storage and keychain access.
  • Biometric authentication.
  • Background tasks and sync.
  • File access and sharing.

Permission strategy​

Permission handling should be intentional:

  • Explain why the app needs the capability before requesting it.
  • Request as late as possible while preserving user context.
  • Handle denial and restricted states gracefully.
  • Document platform differences in copy and fallback behavior.

Never let raw permission requests scatter across screens.

App-owned integration layer​

Create wrappers such as:

  • notificationsService
  • cameraService
  • secureStore
  • locationService

This keeps third-party dependencies and native implementation details behind a stable API that product features can consume safely.

When to write a native module​

Write native code when:

  • There is no dependable library for the capability.
  • Performance or threading behavior must be controlled directly.
  • You need to bridge a proprietary SDK.
  • The product depends on platform APIs not exposed by your current stack.

Background work​

Background execution is heavily constrained on mobile platforms. Document:

  • Which tasks must run in the background.
  • Which guarantees actually exist.
  • Battery and network expectations.
  • Recovery logic if the task is delayed or canceled by the OS.

Assume the operating system is allowed to say no.

Security considerations​

Device capability work often touches sensitive data. Standardize:

  • Secure storage boundaries.
  • Redaction rules in logs.
  • Media handling and upload policies.
  • Token storage and rotation.

Testing requirements​

Every native capability needs:

  • One happy-path test.
  • Denied-permission behavior validation.
  • Error handling coverage.
  • Real-device validation when simulators are not sufficient.

Team rule​

Feature code should ask for a capability from your app layer, not from a third-party SDK directly. That rule keeps upgrades and replacements manageable.

Next, improve performance.