Generate comprehensive documentation for TypeScript's built-in utility types with examples and use cases
Generate comprehensive, accurate documentation for TypeScript's built-in utility types with practical examples and common use cases.
This skill helps you create detailed reference documentation for TypeScript utility types. It covers all built-in utility types including Partial, Required, Pick, Omit, Record, Awaited, Readonly, Exclude, Extract, NonNullable, Parameters, ConstructorParameters, ReturnType, InstanceType, and more.
When the user requests TypeScript utility type documentation, follow these steps:
1. **Identify the scope**: Determine which utility types to document (all, or specific ones requested by the user).
2. **Structure the documentation** with the following sections for each utility type:
- **Name and signature**: `UtilityName<Type>`
- **Release version**: TypeScript version when introduced
- **Purpose**: Clear one-sentence description of what it does
- **Syntax**: Type signature and parameters
- **Example code**: At least 2-3 practical examples showing real-world usage
- **Use cases**: When and why to use this utility type
- **Related utilities**: Other utility types that complement or contrast with it
3. **Include comprehensive examples** that demonstrate:
- Basic usage with simple types
- Advanced usage with complex types
- Common patterns (e.g., API response typing, form handling, state management)
- Edge cases and limitations
4. **Format the output** as markdown with:
- Clear headings and hierarchy
- Syntax-highlighted TypeScript code blocks
- Tables for quick reference when appropriate
- Links to official TypeScript documentation
5. **Cover these essential utility types** (unless user specifies otherwise):
- **Partial<Type>**: Make all properties optional
- **Required<Type>**: Make all properties required
- **Readonly<Type>**: Make all properties read-only
- **Pick<Type, Keys>**: Select specific properties
- **Omit<Type, Keys>**: Remove specific properties
- **Record<Keys, Type>**: Create object type with specific keys
- **Exclude<UnionType, ExcludedMembers>**: Remove types from union
- **Extract<Type, Union>**: Extract types from union
- **NonNullable<Type>**: Remove null and undefined
- **Parameters<Type>**: Extract function parameter types
- **ConstructorParameters<Type>**: Extract constructor parameter types
- **ReturnType<Type>**: Extract function return type
- **InstanceType<Type>**: Extract instance type of constructor
- **Awaited<Type>**: Unwrap Promise types
6. **Add practical context** for each utility:
- Compare with alternative approaches
- Show before/after transformations
- Explain common pitfalls
- Provide IDE/editor tips
**User**: "Document TypeScript utility types for working with APIs"
**Expected Output Structure**:
```markdown
Essential utility types for type-safe API interactions...
**Use case**: Patch/update endpoints where only some fields are sent
[code example with API update function]
**Use case**: Selecting specific fields for response DTOs
[code example with API response transformation]
**Use case**: Typed API endpoint configurations
[code example with route definitions]
[Continue for each relevant utility...]
```
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