singleton-patterns

To prevent database connection exhaustion in serverless functions, use connection pooling and globalThis attachment to initialize database clients once and share them safely across warm invocations.

Module-level state in edge environments is managed safely by attaching resources to globalThis and implementing initialization guards to ensure setup code runs exactly once under concurrent access.

Create a reusable PrismaClient instance for a serverless API by attaching the client to globalThis with an initialization guard, preventing re-initialization during concurrent requests.

Yes, this singleton pattern approach works with HTTP agents and SDK instances by applying connection pooling to reuse them across application lifecycles, preventing resource leaks.

Serverless functions re-initialize expensive resources when module-level state is not persisted; attaching state to globalThis ensures resources are created once and shared across warm invocations.

The best way to ensure idempotency for setup code in serverless environments is using initialization guards that guarantee execution runs exactly once, even under concurrent access.