components.build Specification

The components.build project follows a set of core principles designed to ensure that UI components are high-quality, accessible, and developer-friendly. When building or consuming components within this ecosystem, adhere to these mental models:

Composition and Reusability

Prefer composition over inheritance. Build components that can be combined and nested to create complex UIs. Use clear APIs (via props or slots) to allow developers to inject child elements or callbacks, enabling customization of behavior and appearance without deep class hierarchies.

Accessibility by Default

Components must be usable by everyone from the start.

• Use semantic HTML (e.g., <button> for actions, <ul>/<li> for lists).
• Extend with WAI-ARIA attributes where necessary.
• Support keyboard navigation and focus management (e.g., arrow key navigation in menus, focus traps in modals).
• Ensure correct ARIA roles/states and test with screen readers.

Customizability and Theming

Avoid hardcoding visual styles that cannot be overridden. Components should be easy to restyle to fit any design system. Recommended mechanisms include:

• CSS variables
• Well-documented class names
• Style props
• Providing sensible defaults while allowing overrides via className or design tokens.

Lightweight and Performance-Oriented

Keep components lean to ensure fast rendering and interaction.

• Minimize large library dependencies.
• Minimize unnecessary re-renders.
• For data-intensive components (like large lists or tables), use patterns like virtualization or incremental rendering, but keep these features optional to avoid bloat.

Transparency and Code Ownership

Follow an 'open-source first' mentality. Components should not be 'black boxes'. Developers should be able to see how a component works and modify it if necessary. This supports the 'copy-and-paste' distribution model. Even when distributed via a package, provide source maps, readable code, and thorough documentation.

Documentation and Developer Experience (DX)

A component is only as good as its documentation. To ensure high DX, always document:

• The purpose of the component.
• All available props.
• Usage examples.
• Accessibility notes (keyboard controls, ARIA attributes).
• Customization options.

When building or using components within this ecosystem, the following core principles guide the architecture and implementation:

• Composition and Reusability: Prefer composition over inheritance. Build components that can be combined and nested using clear APIs (via props or slots) to allow developers to customize behavior and appearance by adding child elements or callbacks.
• Accessible by Default: Components must use semantic HTML (e.g., <button> for actions, <ul>/<li> for lists) and appropriate WAI-ARIA attributes. They must support keyboard navigation and focus management (e.g., arrow key navigation in menus, focus traps in modals) out of the box.
• Customization and Theming: Avoid hardcoding visual styles that cannot be overridden. Use mechanisms like CSS variables, documented class names, or style props to allow easy restyling via className or design tokens.
• Lightweight and High Performance: Minimize assets and dependencies. Avoid bloating components with large libraries or unnecessary logic. For data-intensive components, consider optional patterns like virtualization or incremental rendering.
• Transparency and Code Ownership: Components should not be "black boxes." The architecture encourages an "open-source first" mindset where developers can inspect, understand, and even copy-and-paste component code directly into their projects for full control.
• Well-documented and DX-friendly: Every component should be accompanied by clear documentation covering its purpose, props, usage examples, accessibility notes (keyboard controls/ARIA), and customization options.

Marketplaces offer distinct advantages and trade-offs depending on your role:

For Authors

Benefits:

• Infrastructure-free distribution: No need to host or manage CDNs.
• Built-in audience: Organic discovery through platform search and categories.
• Monetization: Opportunities via premium tiers, sponsorships, or usage-based models.
• Community feedback: Access to ratings, comments, and usage analytics.

Challenges:

• Competition: High visibility requirements (previews, documentation) to stand out.
• Platform dependency: Reliance on the marketplace's terms, technical requirements, and existence.
• Quality pressure: High expectations for production-ready, accessible, and responsive code.

For Consumers

Benefits:

• Curated discovery: Organized categories (e.g., Marketing, Application, E-commerce) make finding components faster.
• Quality assurance: Many platforms implement code reviews, accessibility audits, and performance testing.
• Unified tools: A single CLI command works for all components in the marketplace.

Challenges:

• Variable quality: Risk of encountering abandoned components or inconsistent coding styles.
• Lock-in concerns: Potential reliance on proprietary metadata formats or platform-specific configurations.
• Discovery paradox: The difficulty of evaluating many similar options to find the best long-term fit.

The components.build project is guided by several core principles designed to ensure that UI components are high-quality, maintainable, and developer-friendly. When building or using components within this ecosystem, adhere to these mental models:

• Composability and Reusability: Prefer composition over inheritance. Components should expose clear APIs (via props or slots) that allow them to be combined and nested to form complex UIs without deep class hierarchies.
• Accessibility by Default: Components must be usable by everyone. This involves using semantic HTML (e.g., <button>, <ul>, <li>), implementing WAI-ARIA attributes, and ensuring full keyboard navigation and focus management (e.g., arrow key navigation in menus, focus traps in modals).
• Customization and Theming: Components should be easy to restyle. Avoid hardcoding visual styles that cannot be overridden. Use mechanisms like CSS variables, documented class names, or style props to allow integration into any design system.
• Lightweight and Performant: Minimize dependencies and assets. Optimize for rendering and interaction by minimizing unnecessary re-renders. For data-intensive components, consider optional patterns like virtualization or incremental rendering.
• Transparency and Code Ownership: Components should not be "black boxes." The ecosystem encourages an "open-source first" mentality where developers can inspect, understand, and even copy/paste component code directly into their projects for full control.
• Documentation and DX (Developer Experience): High-quality components must include clear documentation of their purpose, props, usage examples, accessibility notes (keyboard controls, ARIA attributes), and customization options.