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ChatKit Node.js Widget System

This document describes the widget type system implementation that provides 100% parity with the Python ChatKit SDK.

Overview

Widgets are JSON structures that describe UI components. The backend creates widget descriptions, and the ChatKit CDN bundle renders them.

Implementation Status: ✅ Complete

All 29 widget components + 3 chart series types implemented with full TypeScript type definitions.

Widget Categories

Content Widgets (7)

Display text, images, and other content:

  • Text - Plain text with typography controls
  • Title - Prominent headline text
  • Caption - Supporting caption text
  • Markdown - Markdown content rendering
  • Badge - Small status/category indicator
  • Icon - Built-in icon component
  • Image - Image with sizing and fitting controls

Layout Widgets (9)

Provide structure and organization:

  • Card - Versatile container for content
  • Box - Generic flex container with direction control
  • Row - Horizontal flex container
  • Col - Vertical flex container
  • Form - Form wrapper with submit action
  • Divider - Visual content separator
  • Spacer - Flexible spacer for pushing content
  • ListViewItem - Single row in a ListView
  • ListView - Container for list items

Interactive Widgets (1)

Handle user interactions:

  • Button - Button with optional action

Form Widgets (7)

Handle user input:

  • Input - Single-line text input
  • Textarea - Multiline text input
  • Select - Dropdown selection
  • Checkbox - Checkbox input
  • RadioGroup - Grouped radio buttons
  • Label - Form field label
  • DatePicker - Date selection input

Advanced Widgets (2)

Complex functionality:

  • Chart - Data visualization (bar/line/area)
  • Transition - Animation wrapper

Chart Series Types (3)

  • BarSeries - Bar chart series
  • AreaSeries - Area chart series
  • LineSeries - Line chart series

Common Types

Styling Types

  • ThemeColor - Light/dark theme colors
  • Spacing - Padding/margin configuration
  • Border - Border style definition
  • Borders - Composite border configuration
  • RadiusValue - Corner radius tokens

Size Tokens

  • TextSize - Body text sizes
  • TitleSize - Title text sizes
  • CaptionSize - Caption text sizes
  • IconSize - Icon sizes
  • ControlSize - Button/input sizes

Layout Types

  • Alignment - Flexbox alignment
  • Justification - Flexbox justification
  • TextAlign - Text alignment

Form Types

  • SelectOption - Select dropdown option
  • RadioOption - Radio group option
  • EditableProps - Inline editing configuration

Widget Types

  • WidgetStatus - Status messaging
  • CardAction - Card action configuration
  • WidgetIcon - 60+ built-in icon names
  • ControlVariant - Button/input variants

File Structure

chatkit-node/src/widgets/
├── common.ts          # Shared types and utilities
├── content.ts         # Text, Markdown, Title, Caption, Badge, Icon, Image
├── layout.ts          # Card, Row, Col, Box, Divider, Spacer, ListView
├── interactive.ts     # Button
├── form.ts            # Input, Textarea, Select, Checkbox, RadioGroup, Label, DatePicker
├── advanced.ts        # Chart, Transition, Series types
└── index.ts           # Main exports and union types

Usage Example

import { Card, Text, Button, WidgetRoot } from '@chatkit/node';

const widget: WidgetRoot = {
  type: 'Card',
  children: [
    {
      type: 'Text',
      value: 'Hello, World!',
      size: 'lg',
      weight: 'bold'
    },
    {
      type: 'Button',
      label: 'Click me',
      variant: 'primary',
      onClickAction: {
        type: 'submit_form',
        form_id: 'my_form'
      }
    }
  ]
};

Type Safety

All widgets are fully typed with:

  • ✅ Required vs optional properties
  • ✅ Literal type unions for enums
  • ✅ Discriminated unions for polymorphic types
  • ✅ Comprehensive JSDoc comments
  • ✅ 100% match with Python SDK structure

Validation

Built successfully with TypeScript strict mode:

npm run build
# ✅ Build success - all types compile correctly

Compatibility

Matches Python SDK (chatkit-python/chatkit/widgets.py):

  • ✅ All 29 widget components implemented
  • ✅ All common types and utilities
  • ✅ Same property names and types
  • ✅ Same union structures (WidgetComponent, WidgetRoot)
  • ✅ Same icon names (60+ icons)

Next Steps

Widgets are now ready for use in ChatKit server implementations. See advanced-chatkit-server.js for examples of creating widgets in server responses.