# Singleton Pattern / Dependency Injection

> "singleton-pattern" (design-patterns-core layer) is traded against "Dependency Injection" (extensibility-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Dependency Injection" and choosing an explicit operating point.

Record: `tension:dependency-injection-singleton-pattern`
Kind: tension
Canonical: https://banes-lab.com/ontology/schema#tension-dependency-injection-singleton-pattern

## tensions-with

- [Singleton Pattern](https://banes-lab.com/records/arch/singleton-pattern.md)
- [Dependency Injection](https://banes-lab.com/records/arch/dependency-injection.md)