The Singleton Architecture Question

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"Singleton vs Multi-instance: How do you structure your Elysia application architecture in production?"

Specific Sub-questions to Include:

Application Structure:

• Do you use a single global Elysia instance or multiple instances?
• How do you organize plugins and middleware across instances?
• If using microservices, do you share Elysia configurations between services?

Plugin & State Management:

• How do you handle shared state and dependencies across your app?
• Do you create singleton services/repositories that get injected into Elysia?
• How do you manage database connections - singleton pool or per-instance?

Testing Challenges:

• How do you mock dependencies when using singleton patterns?
• Do you create separate Elysia instances for testing vs production?
• How do you handle test isolation with shared state?

Performance & Memory:

• Have you observed memory leaks or performance issues with singleton vs multi-instance approaches?
• How does instance creation cost affect your application startup time?
• Any impact on hot-reloading during development?