VOL. III · CH. 3.38 · COMPONENT
Component Libraries
Where a design system's rules become actual, reusable code.
1 min read · 137 words
3.38.1Definition & Anatomy
A component library is the coded implementation of a design system's components — buttons, forms, modals — built once and reused across a product, keeping implementation (not just visual design) consistent.
3.38.2Common Mistakes
- Forking a shared component locally to make a one-off change, silently diverging from the shared source over time.
- No versioning strategy, making it unclear which parts of a product are using which version of a component.
3.38.3Best Practices
- Treat the component library as a versioned internal package, not a folder of copy-pasted code.
- Route one-off visual needs through configurable props rather than local forks of shared components.
Exampleshadcn/ui and similar modern component libraries are distributed as copyable, ownable source rather than opaque installed packages — a deliberate design choice trading some update convenience for full customization control.