Mock Data Validator

Validates that Storybook mock data structures match component TypeScript prop types.

What This Skill Does

Extracts TypeScript interfaces from components, loads mock data from JSON or JS files, and compares structures to identify mismatches. Reports errors for missing required fields, type mismatches, and provides actionable fix suggestions.

When to Use

• •Before creating new Storybook stories - Validate mock data matches component props
• •After refactoring component props - Ensure existing mocks still work
• •When stories render with unexpected data - Debug data structure issues
• •As pre-commit validation - Prevent broken stories from being committed
• •Direct invocation - "Validate mock data for ChatSidebar"

How It Works

1. •Extract Component Props: Parses TypeScript interfaces, type aliases, or JSDoc comments
2. •Load Mock Data: Reads JSON files or JavaScript export objects
3. •Compare Structures: Validates types, required fields, array structures, and nested objects
4. •Report Issues: Lists mismatches with severity levels and specific fix suggestions

Supported Component Patterns

TypeScript Interface

interface ChatSidebarProps {
  messages: Message[];
  onSend: (text: string) => void;
  isLoading?: boolean;
}

✅ Extracts: messages: Message[], onSend: (text: string) => void, isLoading?: boolean | undefined

Type Alias

type ChatSidebarProps = {
  messages: Message[];
  onSend: (text: string) => void;
};

✅ Extracts: Same as interface

JSDoc for JavaScript Components

/**
 * @param {Message[]} messages - Chat messages array
 * @param {function(string): void} onSend - Send message handler
 */
export const ChatSidebar = ({ messages, onSend }) => { };

✅ Extracts: Types from JSDoc annotations

Usage Examples

Validate Single Component

User: "Validate mock data for ChatSidebar"

Agent Response:

✅ Mock data validation passed for ChatSidebar.tsx

Component Props:
  - messages: Message[]
  - onSend: (text: string) => void
  - isLoading?: boolean | undefined

Mock Data Structure:
  - messages: object[]
  - onSend: function
  - isLoading: boolean

Common Issue: Message Format

❌ Legacy format (will break ChatSidebar):

{
  "id": "1",
  "role": "user",
  "content": "Hello"
}

✅ Current format (required):

{
  "id": "1",
  "role": "user",
  "parts": [
    { "type": "text", "text": "Hello" }
  ]
}

Implementation

TypeScript Module: mock-data-validator.ts
Tests: mock-data-validator.test.ts

import { executeSkill } from '.github/skills/mock-data-validator/mock-data-validator';

const result = await executeSkill({
  componentPath: '/absolute/path/to/Component.tsx',
  mockDataPath: '/absolute/path/to/mock-data.json'
});

Testing

npm run test -- .github/skills/mock-data-validator/mock-data-validator.test.ts

Related Skills

• •storybook-validation - Full Storybook testing workflow
• •semantic-file-search - Find component and mock files

Related Documentation

• •Agent Skills Architecture
• •Storybook Mock Data Guide