JSDoc Skill

JSDoc Skill

This skill provides simple, focused guidelines for writing JSDoc comments in TypeScript codebases.

When to Use

• Documenting type properties and configuration options
• Adding context that TypeScript types don't convey
• Providing usage examples for complex APIs
• Writing inline documentation for generated docs

What It Does

• Defines simple JSDoc conventions for TypeScript
• Focuses on property-level documentation with inline comments
• Uses minimal tags for maximum clarity (@default, @example, @note)
• Avoids redundant tags that duplicate TypeScript type information
• Ensures consistent documentation style across the codebase

How to Use

Write inline JSDoc comments directly above properties, focusing on what the option does rather than repeating type information.

Basic Structure

export type Options = {
  /​**
   * Brief description of what this property does.
   * @default 'defaultValue'
   */
  propertyName?: string
}

Common Tags

Use Frequently

Use Sparingly

Avoid (TypeScript Provides)

• ❌ @param - Use TypeScript parameters
• ❌ @returns - Use TypeScript return type
• ❌ @type - Use TypeScript type annotation
• ❌ @typedef - Use type or interface

Documentation Patterns

Simple Property

/​** Output directory for generated files. */
outDir?: string

Property with Default

/​**
 * Set a suffix for generated files.
 * @default 'generated'
 */
suffix?: string

Enum with Options

/​**
 * Choose output format.
 * - 'type' generates type aliases
 * - 'interface' generates interfaces
 * @default 'type'
 */
format?: 'type' | 'interface'

Property with Example

/​**
 * Server index to use.
 * @example
 * - `0` returns production URL
 * - `1` returns development URL
 */
serverIndex?: number

Nested Properties

transformers?: {
  /​** Customize file names. */
  name?: (name: string) => string
  /​** Customize output paths. */
  path?: (path: string) => string
}

Function Documentation

Only add JSDoc when it adds value beyond the signature:

// ✅ No JSDoc needed - signature is clear
function camelCase(str: string): string {
  return str.replace(/​-./​g, x => x[1].toUpperCase())
}

// ✅ JSDoc adds value - explains behavior
/​**
 * Convert path to template string.
 * @example /​api/​{id} => `/​api/​${id}`
 */
function toTemplate(path: string): string {
  // implementation
}

Guidelines

✅ DO:

• Document what the property does, not the type
• Include @default for default values
• Add @example for complex or non-obvious usage
• Use @note for version info or important caveats
• Keep descriptions concise and focused

❌ DON'T:

• Use @param or @returns tags
• Repeat information from TypeScript types
• Over-document simple, self-explanatory properties
• Write redundant descriptions

Tag Order

For consistency, use this tag order:

1. Description (required)
2. @default (if applicable)
3. @example (if helpful)
4. @note (if needed)
5. @deprecated (if applicable)
6. @see (if providing references)

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