rezi-add-widget

name	rezi-add-widget
description	Add a new widget type to the Rezi framework. Use when creating new ui.* factory functions with layout, rendering, and tests.
user-invocable	true
allowed-tools	Read, Glob, Grep, Edit, Write, Bash(node scripts/run-tests.mjs*)
argument-hint	[widget-name]
metadata	{"short-description":"Add new widget"}

Response Format (IMPORTANT)

1. Confirm the widget name, behavior, and props before writing code
2. Follow the steps below in order — each step depends on the previous
3. Run tests after implementation to verify correctness
4. Keep total response concise — show key code, not boilerplate

When to use

Use this skill when:

• Adding a new widget type to @rezi-ui/core
• Creating a new ui.* factory function
• User asks for a new visual element not covered by existing widgets

Source of truth

• packages/core/src/widgets/types.ts — all widget prop types and VNode union
• packages/core/src/widgets/ui.ts — all ui.* factory functions
• packages/core/src/layout/kinds/ — layout handlers by category
• packages/core/src/renderer/renderToDrawlist/widgets/ — render handlers by category
• packages/core/src/index.ts — public exports
• packages/core/src/ui/ — design tokens, recipes, and capabilities
• docs/guide/widget-authoring.md — widget authoring guide with design system integration

Steps

1. Add props type to packages/core/src/widgets/types.ts:

   • Use the Readonly<{...}> pattern
   • Include key?: string if the widget can appear in lists

2. Add VNode kind to the VNode discriminated union in types.ts

3. Add factory function to packages/core/src/widgets/ui.ts:

   • Add JSDoc with @example tag
   • Return a VNode with the correct kind

4. Add layout handler in packages/core/src/layout/kinds/:

   • leaf.ts for non-container widgets
   • box.ts / stack.ts for containers
   • collections.ts for data widgets
   • overlays.ts for layered widgets

5. Add render handler in packages/core/src/renderer/renderToDrawlist/widgets/:

   • basic.ts, containers.ts, collections.ts, editors.ts, overlays.ts, navigation.ts, or files.ts

6. Add design system support (if the widget is interactive):

   • Register the new widget kind in packages/core/src/widgets/protocol.ts
   • Add optional DS props as needed (dsVariant?, dsTone?, dsSize?) for advanced customization
   • Wire recipe-based rendering so baseline DS styling auto-activates when ThemeDefinition semantic tokens are available; DS props override defaults when specified
   • See docs/guide/widget-authoring.md for the full pattern

7. Export both props type and factory from packages/core/src/index.ts

8. Add JSX wrapper (if needed) in packages/jsx/src/components.ts

9. Write tests in

Verification

node scripts/run-tests.mjs

• Widget + props exported from packages/core/src/index.ts
• Renders correctly via createTestRenderer
• Layout produces expected dimensions
• Widget supports ds* props for design-system-based styling (if interactive)
• Widget renders correctly with at least 2 themes