pattern-singleton

What problem does it solve?

Prevents multiple instantiations of heavy shared resources such as database connections, caches, or configuration registries so the application avoids wasted memory and conflicting state. It also exposes a clear global access point so every consumer reuses the same lifecycle-managed object.

Core Features & Use Cases

• Lazy Initialization: A static getter handles the first creation and then reuses the stored instance whenever the service is needed.
• Private Constructor Enforcement: The class prevents direct constructor calls so the instance can only be created internally.
• Use Case: Wrap your NestJS PrismaService or Logger inside this pattern to ensure a single pipeline for database calls or logging across the backend.

Quick Start

Apply the singleton pattern to wrap your PrismaService so only one provider handles database connections across the NestJS application.