Design System 101: Building Reusable Components with Tailwind

What Is a Design System?

A design system is the single source of truth for the visual language of your product. It covers tokens (colors, spacing, typography), components (buttons, inputs, modals), and patterns (forms, navigation, layouts).

Design Tokens First

Start with tokens. Before writing any component, define your color palette, spacing scale, and type ramp. In Tailwind, these live in tailwind.config.ts under theme.extend.

Composable Components

The best component APIs are composable, not configurable. Instead of a button with 20 props, export primitive building blocks that consumers assemble. This is the philosophy behind Radix UI and shadcn/ui.

Variant Management

Use class-variance-authority (CVA) to manage component variants cleanly:

const button = cva("rounded font-medium transition", {
  variants: {
    intent: {
      primary: "bg-blue-600 text-white hover:bg-blue-700",
      secondary: "bg-gray-100 text-gray-900 hover:bg-gray-200",
    },
    size: {
      sm: "px-3 py-1.5 text-sm",
      md: "px-4 py-2 text-base",
    }
  }
})

Documentation Matters

An undocumented component is a black box. Use Storybook to document variants, edge cases, and accessibility requirements. Treat stories as living documentation that runs in CI.