The ones that actually match POSD (deep modules, small interfaces, lower complexity) and work great with plain functions are: Module Pattern Factory Pattern (

The ones that actually match POSD (deep modules, small interfaces, lower complexity) and work great with plain functions are: Module Pattern Factory Pattern (factory functions) Mediator / Middleware Pattern (as function pipelines) Hooks Pattern (custom hooks, generalized) Container / Presentational Pattern (implemented with function components + hooks) Everything else is either neutral, UI-only, or fights POSD (Singleton, Mixin, etc.). Patterns from that page you should treat skeptically for POSD From Patterns.dev, for your POSD-style codebase I’d avoid or downplay: Singleton Pattern → encourages global state and tight coupling. Patterns Mixin Pattern → tends to increase interface surface and make dependencies opaque. Patterns Observer Pattern → powerful, but event-based wiring can obscure data flow and increase “system complexity” (classic POSD warning). Patterns