Component Library
A component library provides the building blocks, but without tokens, guidelines, patterns, and governance, it is just a shared folder. Components built on tokens are inherently more resilient than components with hardcoded values. The best component libraries favor composition over configuration: small composable pieces that combine into patterns, rather than mega-components with 14 props trying to handle every variant.
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Related terms
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Design Tokens
The atomic design values (colors, spacing, typography, shadows, motion) stored as platform-agnostic variables that every component in a design system references.
Design System
A design system is the living product of tokens, components, patterns, guidelines, and governance that stops teams from reinventing UI every sprint.