[Epic] Build Design System

[soroushm]

Epic Overview 🎯

This epic aims to establish a robust design system foundation leveraging @emotion/styled and styled-system. The goal is to define reusable design tokens (colors, typography, spacing, breakpoints), implement base primitives (Box, Flex, Grid), and create reference components (Button, Badge, Input) that set the tone for all future UI development.

By integrating responsive scales, styled-system props, and Storybook documentation, this design system will provide:

• A consistent API for components.
• Faster feature development through reusable building blocks.
• Clear visual alignment with product design.
• A maintainable, extensible system that scales without CSS drift or hardcoded values.

Implementation Details 🛠️

The design system will:

• Design Tokens: Define a theme.ts with tokens for colors, typography, spacing, radii, shadows, and breakpoints.
• Primitives Layer: Create Box, Flex, and Grid as foundational building blocks supporting responsive styled-system props.
• Utility Layer: Add shared styling helpers (e.g., flexCenter, absoluteFill, truncateText) and configure shouldForwardProp to prevent DOM prop leakage.
• Reference Component: Build a Button component with consistent variants, sizes, and token-based styling to serve as a blueprint for future components.
• Component Rollout: Implement base elements (Text, Heading, Badge) followed by form controls (Input, Checkbox, Radio), feedback components (Alert, Spinner), and navigation components (Tabs, Menu).
• Storybook Documentation: Integrate Storybook to visualize tokens, primitives, and components with clear API usage and design mapping.
• Linting and Packaging: Add lint rules to enforce token usage and package the design system for internal/external consumption with Rollup or Vite.
• Future Theme Switching: Prepare the system for light/dark theme support via emotion context or theme-ui integration.

Key Features ✨

Feature	Description
Design Tokens	Centralized theme object defining colors, typography, spacing, radii, shadows, and breakpoints.
Primitives Layer	Box, Flex, and Grid components with full responsive prop support.
Utility Functions	Shared styling helpers to avoid repeating common CSS patterns.
Reference Component	Button with variants, sizes, and icon support as a model for other components.
Component Rollout Plan	Structured development of base elements, form controls, feedback, and navigation components.
Storybook Integration	Documentation hub for tokens and components with developer/designer collaboration.
Theme Switching	Optional light/dark mode support for future product requirements.
Packaging & Linting	Bundle system as a reusable package and enforce token usage through linting or codemods.

Acceptance Criteria ✅

• Theme tokens are defined and stored in theme.ts.
• Base primitives (Box, Flex, Grid) implemented with styled-system props.
• Reference Button component built using design tokens and variants.
• Storybook documents theme tokens and Button component API.
• Initial component rollout (Text, Heading, Badge, Input) completed.
• Code passes linting checks for token usage (no raw CSS values).
• Design system package is ready for internal or external consumption.
• Documentation on design system architecture and usage is complete.

Dependencies

• @emotion/styled and @styled-system/should-forward-prop
• styled-system for responsive props and variants
• Storybook for documentation and visualization
• Rollup or Vite for packaging
• Linting tools (ESLint/Stylelint or custom rules) to enforce token usage