Typescript Docs

TypeScript Documentation

Generate production-ready TypeScript documentation with layered architecture for multiple audiences. Supports API docs with TypeDoc, ADRs, and framework-specific patterns.

Overview

Use JSDoc annotations for inline documentation, TypeDoc for API reference generation, and ADRs for tracking design choices.

Key capabilities:

• TypeDoc configuration and API documentation generation
• JSDoc patterns for all TypeScript constructs
• ADR creation and maintenance
• Framework-specific patterns (NestJS, React, Express, Angular, Vue)
• ESLint validation rules for documentation quality
• GitHub Actions pipeline setup

When to Use

Use this skill when creating API documentation, architectural decision records, code examples, or framework-specific patterns for NestJS, Express, React, Angular, or Vue.

Quick Reference

JSDoc Tags

Instructions

1. Configure TypeDoc

npm install --save-dev typedoc typedoc-plugin-markdown

{
  "entryPoints": ["src/index.ts"],
  "out": "docs/api",
  "theme": "markdown",
  "excludePrivate": true,
  "readme": "README.md"
}

2. Add JSDoc Comments

/**
 * Service for managing user authentication
 *
 * @remarks
 * Handles JWT-based authentication with bcrypt password hashing.
 *
 * @example
 * ```typescript
 * const authService = new AuthService(config);
 * const token = await authService.login(email, password);
 * ```
 *
 * @security
 * - Passwords hashed with bcrypt (cost factor 12)
 * - JWT tokens signed with RS256
 */
@Injectable()
export class AuthService {
  /**
   * Authenticates a user and returns access tokens
   * @param credentials - User login credentials
   * @returns Authentication result with tokens
   * @throws {InvalidCredentialsError} If credentials are invalid
   */
  async login(credentials: LoginCredentials): Promise<AuthResult> {
    // Implementation
  }
}

3. Create an ADR

# ADR-001: TypeScript Strict Mode Configuration

## Status
Accepted

## Context
What is the issue motivating this decision?

## Decision
What change are we proposing?

## Consequences
What becomes easier or more difficult?

4. Set Up CI/CD Pipeline

name: Documentation
on:
  push:
    branches: [main]
    paths: ['src/**', 'docs/**']

jobs:
  generate-docs:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
      - run: npm ci
      - run: npm run docs:generate
      - run: npm run docs:validate

5. Validate Documentation

{
  "rules": {
    "jsdoc/require-description": "error",
    "jsdoc/require-param-description": "error",
    "jsdoc/require-returns-description": "error",
    "jsdoc/require-example": "warn"
  }
}

If validation fails: review ESLint errors, fix JSDoc comments (add missing descriptions, add @param/@returns/@throws where absent), re-run eslint --ext .ts src/ until all errors pass before committing.

Examples

Documenting a React Hook

/**
 * Custom hook for fetching paginated data
 *
 * @remarks
 * This hook manages loading states, error handling, and automatic
 * refetching when the page or filter changes.
 *
 * @example
 * ```tsx
 * function UserList() {
 *   const { data, isLoading, error } = usePaginatedData('/api/users', {
 *     page: currentPage,
 *     limit: 10
 *   });
 *
 *   if (isLoading) return <Spinner />;
 *   if (error) return <ErrorMessage error={error} />;
 *   return <UserTable users={data.items} />;
 * }
 * ```
 *
 * @param endpoint - API endpoint to fetch from
 * @param options - Pagination and filter options
 * @returns Paginated response with items and metadata
 */
export function usePaginatedData<T>(
  endpoint: string,
  options: PaginationOptions
): UsePaginatedDataResult<T> {
  // Implementation
}

Documenting a Utility Function

/**
 * Validates email addresses using RFC 5322 specification
 *
 * @param email - Email address to validate
 * @returns True if email format is valid
 *
 * @example
 * ```typescript
 * isValidEmail('user@example.com'); // true
 * isValidEmail('invalid-email');      // false
 * ```
 *
 * @performance
 * O(n) where n is the email string length
 *
 * @see {@link https://tools.ietf.org/html/rfc5322} RFC 5322 Specification
 */
export function isValidEmail(email: string): boolean {
  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  return emailRegex.test(email);
}

NestJS Controller Documentation

/**
 * REST API endpoints for user management
 *
 * @remarks
 * All endpoints require authentication via Bearer token.
 * Rate limiting: 100 requests per minute per user.
 *
 * @example
 * ```bash
 * curl -H "Authorization: Bearer <token>" https://api.example.com/users/123
 * ```
 *
 * @security
 * - All endpoints use HTTPS
 * - JWT tokens expire after 1 hour
 * - Sensitive data is redacted from logs
 */
@Controller('users')
export class UsersController {
  /**
   * Retrieves a user by ID
   * @param id - User UUID
   * @returns User profile (password excluded)
   */
  @Get(':id')
  async getUser(@Param('id') id: string): Promise<UserProfile> {
    // Implementation
  }
}

Best Practices

1. Document Public APIs: All public methods, classes, and interfaces 2. Use `@example`: Provide runnable examples for complex functions 3. Include `@throws`: Document all possible errors 4. Add `@see`: Cross-reference related functions/types 5. Use `@remarks`: Add implementation details and notes 6. Document Generics: Explain generic constraints and usage 7. Include Performance Notes: Document time/space complexity 8. Add Security Warnings: Highlight security considerations 9. Keep Updated: Update docs when code changes 10. Don't document obvious code: Focus on why, not what

Constraints and Warnings

• Private Members: Use @private or exclude from TypeDoc output
• Complex Types: Document generic constraints and type parameters
• Breaking Changes: Use @deprecated with migration guidance
• Security Info: Never include secrets or credentials in documentation
• Link Validity: Ensure @see references point to valid locations
• Example Code: All examples should be runnable and tested
• Versioning: Keep documentation in sync with code versions

References

• [references/jsdoc-patterns.md](references/jsdoc-patterns.md) — JSDoc patterns for interfaces, functions, classes, generics, and unions
• [references/framework-patterns.md](references/framework-patterns.md) — Framework-specific patterns for NestJS, React, Express, and Angular
• [references/adr-patterns.md](references/adr-patterns.md) — ADR templates and examples
• [references/pipeline-setup.md](references/pipeline-setup.md) — CI/CD pipeline configuration for documentation
• [references/validation.md](references/validation.md) — ESLint rules and validation checklists
• [references/typedoc-configuration.md](references/typedoc-configuration.md) — Complete TypeDoc configuration options
• [references/examples.md](references/examples.md) — Additional code examples

Architectural Decision Records (ADRs)

ADR Template

# ADR-001: [Decision Title]

## Status
Proposed | Accepted | Rejected | Deprecated | Superseded

## Context
What is the issue that we're seeing that is motivating this decision?

## Decision
What is the change that we're proposing and/or doing?

## Consequences
What becomes easier or more difficult to do because of this change?

## Compliance
- Links to standards or regulations
- Impact on compliance requirements

## References
- [TypeScript Strict Mode Documentation](https://www.typescriptlang.org/tsconfig#strict)
- [Related ADRs](#)

Sample ADR

# ADR-003: NestJS Framework Selection for Backend API

## Status
Accepted

## Context
Our Express.js monolith has grown to 50k+ lines with:
- Inconsistent error handling patterns
- No standardized validation
- Difficult testing due to tight coupling
- Poor TypeScript integration

We need a framework that provides:
- Strong TypeScript support
- Opinionated structure
- Built-in validation and error handling
- Excellent testing support
- Microservices readiness

## Decision
Adopt NestJS for all new backend services with:
- Full TypeScript strict mode
- Class-based DI container
- Modular architecture
- Built-in validation pipes
- Exception filters
- Swagger/OpenAPI integration

## Consequences

### Positive
- 40% reduction in boilerplate code
- Consistent patterns across services
- Improved testability with dependency injection
- Better developer experience with decorators
- Built-in support for microservices

### Negative
- Learning curve for team (2-3 weeks)
- More complex for simple APIs
- Requires understanding of decorators
- Additional build step needed

## Implementation
1. Create NestJS starter template
2. Migrate new services to NestJS
3. Gradually refactor critical Express services
4. Establish NestJS best practices guide

## Compliance
- Aligns with architecture standards v2.1
- Supports SOC2 through better error handling
- Enables GDPR compliance with structured logging

ADR Scripts

Add to package.json:

{
  "scripts": {
    "adr:new": "node scripts/create-adr.js",
    "adr:generate-index": "node scripts/generate-adr-index.js"
  }
}

TypeScript Documentation Examples

Complete Module Documentation Example

/**
 * @packageDocumentation
 * # Authentication Module
 *
 * This module provides comprehensive authentication and authorization functionality
 * for the application, implementing JWT-based authentication with refresh tokens,
 * multi-factor authentication, and role-based access control.
 *
 * ## Features
 * - JWT authentication with access and refresh tokens
 * - OAuth2 integration for social logins
 * - Multi-factor authentication (MFA) support
 * - Role-based access control (RBAC)
 * - Session management across devices
 * - Password reset and account recovery
 *
 * ## Usage
 * ```typescript
 * // app.module.ts
 * import { AuthModule } from '@app/auth';
 *
 * @Module({
 *   imports: [
 *     AuthModule.register({
 *       jwtSecret: process.env.JWT_SECRET,
 *       accessTokenExpiry: '15m',
 *       refreshTokenExpiry: '7d',
 *       enableMfa: true
 *     })
 *   ]
 * })
 * export class AppModule {}
 * ```
 *
 * ## Security Considerations
 * - All tokens are signed with RS256 algorithm
 * - Refresh tokens are stored securely in database
 * - Rate limiting is applied to authentication endpoints
 * - Passwords are hashed using bcrypt with cost factor 12
 *
 * ## Architecture
 * This module follows the hexagonal architecture pattern with:
 * - Domain entities in `domain/`
 * - Application services in `application/`
 * - Infrastructure adapters in `infrastructure/`
 * - Presentation controllers in `presentation/`
 *
 * @module auth
 * @preferred
 */

export { AuthService } from './application/services/auth.service';
export { JwtAuthGuard } from './presentation/guards/jwt-auth.guard';
export { RolesGuard } from './presentation/guards/roles.guard';
export { AuthModule } from './auth.module';
export * from './domain/entities';
export * from './domain/repositories';
export * from './domain/value-objects';

Complex Interface Documentation

/**
 * User entity representing an authenticated user in the system
 * @interface User
 * @category Domain Entities
 * @subcategory User Management
 *
 * @remarks
 * This interface represents the core user entity in our domain model.
 * It includes authentication data, profile information, and metadata.
 * The entity is immutable - all updates return new instances.
 *
 * ## Example
 * ```typescript
 * const user: User = {
 *   id: "550e8400-e29b-41d4-a716-446655440000",
 *   email: "john.doe@example.com",
 *   roles: [UserRole.USER, UserRole.ADMIN],
 *   profile: {
 *     firstName: "John",
 *     lastName: "Doe",
 *     avatar: "https://example.com/avatar.jpg"
 *   },
 *   preferences: {
 *     theme: Theme.DARK,
 *     language: "en-US",
 *     timezone: "America/New_York"
 *   },
 *   security: {
 *     mfaEnabled: true,
 *     lastPasswordChange: new Date("2024-01-15"),
 *     loginAttempts: 0
 *   },
 *   metadata: {
 *     createdAt: new Date("2023-01-01"),
 *     updatedAt: new Date("2024-01-15"),
 *     createdBy: "system",
 *     version: 2
 *   }
 * };
 * ```
 *
 * ## Validation Rules
 * - `id` must be a valid UUID v4
 * - `email` must be a valid email format
 * - `roles` must contain at least one role
 * - `profile.firstName` and `profile.lastName` are required
 * - `preferences.language` must be a valid locale
 *
 * ## Invariants
 * - User ID is immutable once set
 * - Email is unique across all users
 * - At least one role is always assigned
 * - CreatedAt is never modified after creation
 *
 * @see {@link UserRole} for available roles
 * @see {@link UserProfile} for profile structure
 * @see {@link UserPreferences} for preference options
 * @see {@link UserSecurity} for security settings
 * @see {@link BaseMetadata} for metadata fields
 */
export interface User {
  /**
   * Unique identifier for the user
   * @remarks
   * Generated using UUID v4 algorithm for global uniqueness
   * This field is immutable after user creation
   * @format uuid
   * @example "550e8400-e29b-41d4-a716-446655440000"
   */
  readonly id: string;

  /**
   * User's email address - used as primary identifier for login
   * @remarks
   * Must be unique across all users in the system
   * Validated against RFC 5322 email format
   * Can be changed but requires email verification
   * @format email
   * @example "user@example.com"
   */
  email: string;

  /**
   * Array of roles assigned to the user for RBAC
   * @remarks
   * Determines user's permissions throughout the system
   * Must contain at least one role
   * Roles are additive - more roles = more permissions
   * @minItems 1
   * @uniqueItems true
   */
  roles: UserRole[];

  /**
   * User's profile information
   * @remarks
   * Contains personal and display information
   * All fields are optional except firstName and lastName
   * Can be updated by user or admin
   */
  profile: UserProfile;

  /**
   * User preferences and settings
   * @remarks
   * Controls UI/UX personalization
   * Applied immediately on change
   * Can be overridden by admin policies
   */
  preferences: UserPreferences;

  /**
   * Security-related information
   * @remarks
   * Tracks security settings and state
   * Used for access control and auditing
   * Some fields are read-only for users
   */
  security: UserSecurity;

  /**
   * System metadata for the user
   * @remarks
   * Automatically managed by the system
   * Contains audit trail and versioning info
   * Never directly modified by users
   */
  readonly metadata: BaseMetadata;
}

Complex Class Documentation

/**
 * Service for managing user authentication and authorization
 * @class AuthService
 * @category Application Services
 * @subcategory Authentication
 *
 * @remarks
 * Core service handling all authentication logic including:
 * - User login/logout with email/password
 * - JWT token generation and validation
 * - Refresh token management
 * - Multi-factor authentication flows
 * - Password reset and recovery
 * - Account lockout protection
 * - Session management across devices
 *
 * ## Architecture
 * This service is part of the application layer in our hexagonal architecture.
 * It orchestrates domain entities and infrastructure services without
 * containing business logic, which resides in domain entities.
 *
 * ## Dependencies
 * - {@link UserRepository} for user data access
 * - {@link JwtService} for token operations
 * - {@link HashService} for password hashing
 * - {@link EventBus} for domain events
 * - {@link RateLimiter} for brute force protection
 *
 * ## Security Considerations
 * - All passwords are hashed using bcrypt with cost factor 12
 * - JWT tokens use RS256 algorithm with rotating keys
 * - Refresh tokens are stored hashed in database
 * - Rate limiting prevents brute force attacks
 * - Account lockout after failed attempts
 * - CSRF protection on all state-changing operations
 *
 * ## Performance
 * - Average login time: ~200ms
 * - Token validation: ~5ms
 * - Uses Redis for session caching
 * - Connection pooling for database queries
 * - Lazy loading for user relationships
 *
 * ## Example Usage
 * ```typescript
 * const authService = new AuthService({
 *   userRepository,
 *   jwtService,
 *   hashService,
 *   eventBus,
 *   rateLimiter,
 *   config: {
 *     jwtSecret: process.env.JWT_SECRET!,
 *     accessTokenExpiry: '15m',
 *     refreshTokenExpiry: '7d',
 *     enableMfa: true,
 *     maxLoginAttempts: 5,
 *     lockoutDuration: '15m'
 *   }
 * });
 *
 * // Authenticate user
 * const result = await authService.login({
 *   email: 'user@example.com',
 *   password: 'password123',
 *   rememberMe: true
 * });
 *
 * if (result.success) {
 *   console.log('Access token:', result.accessToken);
 *   console.log('Refresh token:', result.refreshToken);
 * }
 * ```
 *
 * ## Error Handling
 * All methods return {@link Result} types for explicit error handling.
 * Common errors include:
 * - `InvalidCredentialsError` - Wrong email/password
 * - `AccountLockedError` - Account temporarily locked
 * - `TokenExpiredError` - Token has expired
 * - `InvalidTokenError` - Token is invalid or tampered
 *
 * @see {@link LoginCommand} for login parameters
 * @see {@link AuthResult} for authentication response
 * @see {@link User} for user entity structure
 * @see {@link JwtPayload} for token payload structure
 */
export class AuthService {
  private readonly logger = new Logger(AuthService.name);

  /**
   * Creates an instance of AuthService
   * @param dependencies - Service dependencies
   * @param dependencies.userRepository - User data access
   * @param dependencies.jwtService - JWT token operations
   * @param dependencies.hashService - Password hashing
   * @param dependencies.eventBus - Domain event publishing
   * @param dependencies.rateLimiter - Rate limiting service
   * @param dependencies.config - Service configuration
   */
  constructor(
    private readonly dependencies: AuthServiceDependencies
  ) {}

  /**
   * Authenticates a user with email and password
   * @param command - Login command with credentials
   * @returns Authentication result with tokens or error
   *
   * @remarks
   * Implements the complete login flow:
   * 1. Validates input data
   * 2. Checks rate limits for IP/email
   * 3. Retrieves user by email
   * 4. Verifies password hash
   * 5. Checks account status (active, not locked)
   * 6. Generates JWT tokens
   * 7. Updates last login timestamp
   * 8. Publishes UserLoggedIn event
   * 9. Returns tokens to caller
   *
   * @throws {ValidationError} If command data is invalid
   * @throws {RateLimitExceededError} If too many attempts
   * @throws {InvalidCredentialsError} If credentials don't match
   * @throws {AccountLockedError} If account is locked
   *
   * @security
   - Passwords are never logged
   * - Failed attempts are rate limited
   * - Account lockout prevents brute force
   * - Tokens are signed with private key
   *
   * @performance
   * - Average response time: 200ms
   * - Database query optimized with index
   * - Password hash uses bcrypt (100ms average)
   * - Token generation is synchronous (5ms)
   */
  async login(command: LoginCommand): Promise<Result<AuthResult, LoginError>> {
    this.logger.log(`Login attempt for email: ${command.email}`);

    // Implementation
  }

  /**
   * Refreshes an access token using a refresh token
   * @param refreshToken - Valid refresh token
   * @returns New access token or error
   *
   * @remarks
   * Implements secure token refresh:
   * - Validates refresh token signature and expiry
   * - Checks if token is in blacklist
   * - Retrieves associated user
   * - Generates new access token
   * - Optionally rotates refresh token
   *
   * @security
   * - Refresh tokens are single-use when rotation is enabled
   * - Tokens are checked against blacklist
   * - User must still be active
   */
  async refreshToken(
    refreshToken: string
  ): Promise<Result<RefreshResult, TokenError>> {
    this.logger.log('Token refresh requested');

    // Implementation
  }
}

Generic Type Documentation

/**
 * Repository pattern implementation for domain entities
 * @abstract
 * @class BaseRepository
 * @template T - Domain entity type (must extend BaseEntity)
 * @template K - Primary key type (string or number)
 * @template E - Error type for repository operations
 *
 * @remarks
 * Abstract base class implementing the repository pattern for
 * domain-driven design. Provides common CRUD operations while
 * allowing concrete implementations to define persistence details.
 *
 * ## Type Parameters
 * - `T` - The domain entity type being persisted
 *   - Must extend {@link BaseEntity}
 *   - Must have an `id` property of type `K`
 *   - Should be immutable (readonly properties)
 *
 * - `K` - The primary key type
 *   - Typically `string` (UUID) or `number` (auto-increment)
 *   - Must be serializable
 *   - Should be immutable once assigned
 *
 * - `E` - Custom error type for repository-specific errors
 *   - Extends {@link RepositoryError}
 *   - Allows typed error handling
 *   - Provides context-specific error information
 *
 * ## Example Implementation
 * ```typescript
 * interface User extends BaseEntity {
 *   readonly id: string;
 *   email: string;
 *   roles: UserRole[];
 * }
 *
 * class UserRepository extends BaseRepository<User, string, UserRepositoryError> {
 *   async findById(id: string): Promise<Result<User, UserRepositoryError>> {
 *     try {
 *       const user = await this.db.users.findUnique({ where: { id } });
 *       return user ? success(user) : failure(new UserNotFoundError(id));
 *     } catch (error) {
 *       return failure(new DatabaseError(error.message));
 *     }
 *   }
 *
 *   async save(user: User): Promise<Result<void, UserRepositoryError>> {
 *     try {
 *       await this.db.users.upsert({
 *         where: { id: user.id },
 *         update: user,
 *         create: user
 *       });
 *       return success(undefined);
 *     } catch (error) {
 *       return failure(new DatabaseError(error.message));
 *     }
 *   }
 *
 *   async findByEmail(email: string): Promise<Result<User[], UserRepositoryError>> {
 *     try {
 *       const users = await this.db.users.findMany({ where: { email } });
 *       return success(users);
 *     } catch (error) {
 *       return failure(new DatabaseError(error.message));
 *     }
 *   }
 * }
 * ```
 *
 * ## Performance Considerations
 * - Implement connection pooling in concrete classes
 * - Use database indexes for find operations
 * - Consider caching for frequently accessed entities
 * - Implement batch operations where appropriate
 *
 * ## Error Handling
 * - All operations return {@link Result} types
 * - Errors are typed and domain-specific
 * - Connection errors are wrapped appropriately
 * - Validation errors include field details
 *
 * @see {@link Result} for error handling pattern
 * @see {@link RepositoryError} for base error type
 * @see {@link BaseEntity} for entity requirements
 */
export abstract class BaseRepository<
  T extends BaseEntity,
  K extends string | number,
  E extends RepositoryError
> {
  /**
   * Finds an entity by its unique identifier
   * @abstract
   * @param id - The primary key value
   * @returns Result containing the entity or an error
   *
   * @remarks
   * This method should:
   * - Return null/failure if entity not found
   * - Return failure for database errors
   * - Validate the ID format
   * - Consider implementing caching
   *
   * @throws Never throws - returns Result instead
   */
  abstract findById(id: K): Promise<Result<T | null, E>>;

  /**
   * Persists an entity (create or update)
   * @abstract
   * @param entity - The entity to save
   * @returns Result indicating success or failure
   *
   * @remarks
   * Implementations should:
   * - Handle both create and update operations
   * - Validate entity before persisting
   * - Return appropriate errors for constraints
   * - Update metadata (updatedAt, version)
   */
  abstract save(entity: T): Promise<Result<void, E>>;

  /**
   * Deletes an entity by ID
   * @abstract
   * @param id - The primary key value
   * @returns Result indicating success or failure
   *
   * @remarks
   * Implementations should:
   * - Return success even if entity doesn't exist
   * - Handle cascade deletes if configured
   * - Consider soft delete vs hard delete
   * - Log deletion for audit purposes
   */
  abstract deleteById(id: K): Promise<Result<void, E>>;
}

Decorator Documentation

/**
 * Decorator for marking methods that require specific permissions
 * @decorator
 * @function RequirePermissions
 * @param permissions - Array of permission strings required
 * @param options - Additional configuration options
 * @returns Method decorator
 *
 * @remarks
 * This decorator implements declarative permission checking for class methods.
 * It integrates with the authorization system to verify that the current user
 * has all required permissions before method execution.
 *
 * ## Usage
 * ```typescript
 * class DocumentService {
 *   @RequirePermissions(['document:read', 'document:write'])
 *   async updateDocument(id: string, data: UpdateDocumentDto): Promise<Document> {
 *     // Method implementation
 *   }
 *
 *   @RequirePermissions(['admin:*'], { requireAll: false })
 *   async deleteDocument(id: string): Promise<void> {
 *     // Method implementation
 *   }
 * }
 * ```
 *
 * ## How it Works
 * 1. Intercepts method call before execution
 * 2. Retrieves current user from context
 * 3. Checks if user has required permissions
 * 4. Throws {@link InsufficientPermissionsError} if check fails
 * 5. Executes original method if check passes
 *
 * ## Options
 * - `requireAll` (default: true) - Whether all permissions are required
 * - `failOnMissing` (default: true) - Whether to fail if permissions missing
 * - `condition` - Custom condition function for dynamic checks
 *
 * ## Integration with Frameworks
 * ### NestJS
 * ```typescript
 * @Controller('documents')
 * export class DocumentController {
 *   @Post(':id')
 *   @RequirePermissions(['document:write'])
 *   async update(
 *     @Param('id') id: string,
 *     @Body() data: UpdateDocumentDto
 *   ) {
 *     // Controller logic
 *   }
 * }
 * ```
 *
 * ## Performance
 * - Permission check is cached for request lifecycle
 * - Decorator adds minimal overhead (<1ms)
 * - Works with async and sync methods
 *
 * ## Error Handling
 * - Throws {@link InsufficientPermissionsError} on permission failure
 * - Includes required and actual permissions in error
 * - Integrates with global exception handlers
 *
 * @see {@link PermissionService} for permission checking logic
 * @see {@link InsufficientPermissionsError} for error details
 * @see {@link AuthorizationContext} for context requirements
 */
export function RequirePermissions(
  permissions: string[],
  options: PermissionOptions = {}
): MethodDecorator {
  return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
    // Implementation
  };
}

Advanced JSDoc Features

/**
 * Calculates the optimal route between multiple waypoints
 * @function calculateRoute
 * @param waypoints - Array of geographic coordinates
 * @param options - Routing options and constraints
 * @returns Promise resolving to optimized route
 *
 * @template T - Waypoint type extending {@link GeoCoordinate}
 * @template O - Options type extending {@link RouteOptions}
 *
 * @example
 * ```typescript
 * const waypoints: GeoCoordinate[] = [
 *   { lat: 40.7128, lng: -74.0060, name: "New York" },
 *   { lat: 34.0522, lng: -118.2437, name: "Los Angeles" },
 *   { lat: 41.8781, lng: -87.6298, name: "Chicago" }
 * ];
 *
 * const route = await calculateRoute(waypoints, {
 *   optimize: true,
 *   avoidTolls: true,
 *   vehicleType: VehicleType.CAR,
 *   departureTime: new Date()
 * });
 *
 * console.log(`Total distance: ${route.totalDistance} km`);
 * console.log(`Estimated time: ${route.estimatedTime} hours`);
 * console.log(`Waypoints order: ${route.optimizedOrder}`);
 * ```
 *
 * @complexity
 * Time complexity: O(n² × 2ⁿ) where n is the number of waypoints
 * Space complexity: O(n × 2ⁿ) for the dynamic programming table
 *
 * @performance
 * - Optimized for n ≤ 20 waypoints
 * - Uses Web Workers for calculations > 100ms
 * - Implements early termination for time constraints
 * - Caches results for identical requests
 *
 * @accuracy
 * Distance calculations use Haversine formula with ±0.5% accuracy
 * Time estimates based on historical traffic data with 85% confidence
 * Elevation data from SRTM with 30m resolution
 *
 * @limitations
 * - Maximum 50 waypoints per request
 * - Routing limited to supported regions
 * - No real-time traffic integration in free tier
 * - Elevation gain calculations exclude tunnels/bridges
 *
 * @since 2.0.0
 * @author Jane Developer <jane@example.com>
 * @copyright 2024 MyCompany
 * @license MIT
 *
 * @throws {RouteCalculationError} If no valid route exists
 * @throws {MaxWaypointsError} If waypoints.length > 50
 * @throws {RegionNotSupportedError} For unsupported geographic regions
 *
 * @todo Implement real-time traffic integration
 * @todo Add support for electric vehicle routing
 * @todo Integrate weather conditions
 *
 * @see {@link https://developers.google.com/maps/documentation/directions Directions API}
 * @see {@link https://en.wikipedia.org/wiki/Haversine_formula Haversine Formula}
 * @see {@link RouteOptimizer} for optimization algorithm details
 */
export async function calculateRoute<T extends GeoCoordinate, O extends RouteOptions>(
  waypoints: T[],
  options?: O
): Promise<RouteResult<T>> {
  // Implementation
}

Package Documentation

/**
 * @packageDocumentation
 * # Data Validation Library
 *
 * A comprehensive, type-safe validation library for TypeScript with zero dependencies.
 * Provides declarative validation rules, custom validators, and detailed error messages.
 *
 * ## Features
 * - 🔒 **Type-safe**: Full TypeScript support with compile-time validation
 * - 🚀 **Fast**: Optimized validation with minimal runtime overhead
 * - 🎯 **Declarative**: Define rules using decorators or schema objects
 * - 🔧 **Extensible**: Create custom validators for any use case
 * - 📱 **Framework agnostic**: Works with any TypeScript project
 * - 🌍 **i18n ready**: Built-in internationalization support
 *
 * ## Quick Start
 * ```typescript
 * import { validate, IsEmail, IsNotEmpty, MinLength } from '@myorg/validation';
 *
 * class CreateUserDto {
 *   @IsEmail()
 *   email: string;
 *
 *   @IsNotEmpty()
 *   @MinLength(8)
 *   password: string;
 * }
 *
 * const errors = await validate(createUserDto);
 * if (errors.length > 0) {
 *   console.log('Validation failed:', errors);
 * }
 * ```
 *
 * ## Core Concepts
 *
 * ### Validators
 * Validators are functions that check if a value meets specific criteria:
 * ```typescript
 * const validator = IsEmail();
 * const result = validator('test@example.com'); // true
 * ```
 *
 * ### Validation Rules
 * Rules combine multiple validators with logical operators:
 * ```typescript
 * const rule = And(IsString(), MinLength(5), MaxLength(50));
 * ```
 *
 * ### Validation Schemas
 * Schemas define validation rules for complex objects:
 * ```typescript
 * const schema = Schema({
 *   name: IsString(),
 *   age: And(IsNumber(), Min(0), Max(120))
 * });
 * ```
 *
 * ## Advanced Usage
 *
 * ### Custom Validators
 * ```typescript
 * function IsStrongPassword(): Validator {
 *   return (value: string) => {
 *     return /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/.test(value);
 *   };
 * }
 * ```
 *
 * ### Conditional Validation
 * ```typescript
 * class Order {
 *   @IsNotEmpty()
 *   type: 'personal' | 'business';
 *
 *   @When(obj => obj.type === 'business', IsNotEmpty())
 *   companyName?: string;
 * }
 * ```
 *
 * ### Async Validation
 * ```typescript
 * async function IsUniqueEmail(): AsyncValidator {
 *   return async (value: string) => {
 *     const exists = await userRepository.existsByEmail(value);
 *     return !exists;
 *   };
 * }
 * ```
 *
 * ## Framework Integration
 *
 * ### NestJS
 * ```typescript
 * @Controller('users')
 * export class UserController {
 *   @Post()
 *   async create(@Body() @Validate() createUserDto: CreateUserDto) {
 *     // DTO is automatically validated
 *   }
 * }
 * ```
 *
 * ### Express.js
 * ```typescript
 * app.post('/users', validateBody(CreateUserDto), (req, res) => {
 *   // req.body is validated
 * });
 * ```
 *
 * ### React Hook Form
 * ```typescript
 * const { register, handleSubmit, formState: { errors } } = useForm({
 *   resolver: validationResolver(CreateUserDto)
 * });
 * ```
 *
 * ## Performance
 * - Validation runs in ~0.1ms per field on average
 * - Zero allocations for simple validations
 * - Lazy evaluation stops on first error
 * - Optimized for V8's hidden classes
 *
 * ## Browser Support
 * - Chrome 60+
 * - Firefox 55+
 * - Safari 11+
 * - Edge 79+
 *
 * ## License
 * MIT © [MyCompany](https://mycompany.com)
 *
 * ## Contributing
 * See [CONTRIBUTING.md](https://github.com/myorg/validation/blob/main/CONTRIBUTING.md)
 *
 * ## Changelog
 * See [CHANGELOG.md](https://github.com/myorg/validation/blob/main/CHANGELOG.md)
 */

These examples demonstrate comprehensive TypeScript documentation patterns that serve multiple audiences and provide rich context for understanding and using the code effectively. The documentation includes practical examples, performance notes, security considerations, and cross-references to related types and modules. This approach ensures that both human developers and documentation generation tools can extract maximum value from the JSDoc comments. The key is to balance thoroughness with readability, providing essential information without overwhelming the reader with unnecessary details. Remember to keep examples current, validate that code samples compile correctly, and maintain consistency in documentation style across your codebase. Effective TypeScript documentation is an investment that pays dividends in reduced onboarding time, fewer support requests, and improved code maintainability. 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Framework-Specific Documentation Patterns

NestJS Documentation

Guard Documentation

/**
 * Guard for protecting routes with JWT authentication
 *
 * @guard
 * @remarks
 * Validates JWT tokens from Authorization header.
 * Attaches user data to request object.
 *
 * @usageNotes
 * Apply to controllers or methods:
 * ```typescript
 * @Controller('users')
 * @UseGuards(JwtAuthGuard)
 * export class UserController {
 *   @Get('profile')
 *   getProfile(@Request() req) {
 *     return req.user;
 *   }
 * }
 * ```
 *
 * @security
 * - Validates token signature
 * - Checks token expiration
 * - Prevents token replay attacks
 *
 * @performance
 * - Caches validation results for 5 minutes
 * - Uses Redis for distributed caching
 */
@Injectable()
export class JwtAuthGuard implements CanActivate {
  constructor(private jwtService: JwtService) {}

  /**
   * Validates JWT token and extracts user data
   * @param context - Execution context
   * @returns True if authentication successful
   */
  async canActivate(context: ExecutionContext): Promise<boolean> {
    // Implementation
  }
}

Decorator Documentation

/**
 * Decorator for rate limiting endpoints
 * @decorator
 * @param options - Rate limiting options
 *
 * @usageNotes
 * Apply to controller methods:
 * ```typescript
 * @Controller('users')
 * export class UserController {
 *   @Get()
 *   @RateLimit({ points: 100, duration: 60 })
 *   async findAll() {
 *     // Implementation
 *   }
 * }
 * ```
 *
 * @see {@link RateLimitInterceptor}
 * @see {@link RateLimitOptions}
 */
export const RateLimit = (options: RateLimitOptions) =>
  applyDecorators(
    UseInterceptors(RateLimitInterceptor),
    SetMetadata('rateLimit', options)
  );

React Component Documentation

/**
 * User profile card component
 * @component
 * @param {UserProfileProps} props - Component props
 * @param {User} props.user - User data to display
 * @param {boolean} props.editable - Whether profile is editable
 * @param {function} props.onEdit - Edit button click handler
 *
 * @example
 * ```tsx
 * export default function Dashboard() {
 *   const { user } = useAuth();
 *
 *   return (
 *     <div>
 *       <h1>User Profile</h1>
 *       <UserProfile
 *         user={user}
 *         editable={true}
 *         onEdit={() => console.log('Edit clicked')}
 *       />
 *     </div>
 *   );
 * }
 * ```
 *
 * @performance
 * - Memoized with React.memo
 * - Lazy loads avatar images
 * - Optimistic UI updates
 *
 * @accessibility
 * - Full keyboard navigation
 * - ARIA labels for screen readers
 * - High contrast support
 */
export const UserProfile = React.memo<UserProfileProps>(
  ({ user, editable, onEdit }) => {
    // Implementation
  }
);

Custom Hook Documentation

/**
 * Custom hook for managing form state with validation
 * @hook
 * @param schema - Yup validation schema
 * @param initialValues - Initial form values
 * @returns Form state and handlers
 *
 * @example
 * ```tsx
 * function LoginForm() {
 *   const { values, errors, handleSubmit, handleChange } = useForm({
 *     schema: loginSchema,
 *     initialValues: { email: '', password: '' }
 *   });
 *
 *   return (
 *     <form onSubmit={handleSubmit}>
 *       <input
 *         name="email"
 *         value={values.email}
 *         onChange={handleChange}
 *       />
 *       {errors.email && <span>{errors.email}</span>}
 *     </form>
 *   );
 * }
 * ```
 *
 * @performance
 * - Memoized validation to prevent unnecessary re-renders
 * - Debounced validation for better UX
 * - Optimistic updates for better perceived performance
 */
export function useForm<T>({
  schema,
  initialValues
}: UseFormOptions<T>): UseFormReturn<T> {
  // Implementation
}

Express Middleware Documentation

/**
 * Rate limiting middleware with Redis backend
 * @middleware
 * @param options - Rate limiting options
 * @param options.windowMs - Time window in milliseconds
 * @param options.max - Maximum requests per window
 * @param options.keyGenerator - Function to generate rate limit key
 *
 * @example
 * ```typescript
 * app.use('/api', rateLimit({
 *   windowMs: 15 * 60 * 1000, // 15 minutes
 *   max: 100, // limit each IP to 100 requests per windowMs
 *   keyGenerator: (req) => req.ip
 * }));
 * ```
 *
 * @errorResponses
 * - `429` - Too many requests
 * - `500` - Redis connection error
 *
 * @security
 * - Prevents DoS attacks
 * - Implements sliding window algorithm
 * - Distributed across multiple servers
 */
export function rateLimit(options: RateLimitOptions): RequestHandler {
  // Implementation
}

Angular Documentation

Service Documentation

/**
 * Service for managing user sessions
 * @injectable
 * @providedIn root
 *
 * @remarks
 * Handles user authentication state across the application.
 * Automatically refreshes tokens before expiry.
 *
 * @example
 * ```typescript
 * export class AppComponent {
 *   constructor(private authService: AuthService) {}
 *
 *   async login() {
 *     await this.authService.login(credentials);
 *   }
 * }
 * ```
 *
 * @security
 * - Stores tokens in secure storage
 * - Implements token refresh logic
 * - Handles logout on all tabs (broadcast channel)
 */
@Injectable({
  providedIn: 'root'
})
export class AuthService {
  // Implementation
}

JSDoc Documentation Patterns

Interface Documentation

/**
 * Represents a user in the authentication system
 * @interface User
 *
 * @property id - Unique identifier (UUID v4)
 * @property email - User's email address (validated format)
 * @property roles - Array of user roles for RBAC
 * @property metadata - Additional user data (preferences, settings)
 *
 * @example
 * ```typescript
 * const user: User = {
 *   id: "550e8400-e29b-41d4-a716-446655440000",
 *   email: "user@example.com",
 *   roles: ["user", "admin"],
 *   metadata: {
 *     theme: "dark",
 *     language: "en"
 *   }
 * };
 * ```
 *
 * @see {@link UserRole} for role definitions
 * @see {@link UserService} for user operations
 */
export interface User {
  id: string;
  email: string;
  roles: UserRole[];
  metadata: Record<string, unknown>;
}

Function Documentation

/**
 * Authenticates a user with email and password
 * @param email - User's email address
 * @param password - User's password (min 8 characters)
 * @param options - Additional authentication options
 * @returns Promise resolving to authentication result
 *
 * @throws {InvalidCredentialsError} If email/password don't match
 * @throws {AccountLockedError} If account is locked after failed attempts
 * @throws {RateLimitExceededError} If too many attempts made
 *
 * @remarks
 * Implements secure authentication with:
 * - Bcrypt password hashing (cost factor 12)
 * - Rate limiting (5 attempts per 15 minutes)
 * - Account lockout after 3 consecutive failures
 * - JWT token generation with 15-minute expiry
 *
 * @example
 * ```typescript
 * try {
 *   const result = await authenticateUser("user@example.com", "password123");
 *   console.log(`Authenticated: ${result.user.email}`);
 * } catch (error) {
 *   if (error instanceof InvalidCredentialsError) {
 *     // Handle invalid credentials
 *   }
 * }
 * ```
 *
 * @security
 * - Passwords are never logged or stored in plain text
 * - Uses timing-attack safe comparison
 * - Implements CSRF protection for web requests
 *
 * @performance
 * - Average response time: ~200ms
 * - Uses connection pooling for database queries
 * - Caches user permissions for 5 minutes
 */
export async function authenticateUser(
  email: string,
  password: string,
  options?: AuthOptions
): Promise<AuthResult> {
  // Implementation
}

Class Documentation

/**
 * Service for managing user authentication and authorization
 *
 * @remarks
 * This service handles:
 * - User authentication with JWT tokens
 * - Password reset flows
 * - Multi-factor authentication
 * - Session management
 * - Role-based access control
 *
 * @example
 * ```typescript
 * const authService = new AuthService(config);
 *
 * // Authenticate user
 * const token = await authService.login(email, password);
 *
 * // Verify token
 * const user = await authService.verifyToken(token);
 * ```
 *
 * @security
 * - All passwords hashed with bcrypt
 * - JWT tokens signed with RS256
 * - Rate limiting on authentication endpoints
 * - Secure session management
 *
 * @performance
 * - Uses Redis for session storage
 * - Implements connection pooling
 * - Caches user permissions
 */
export class AuthService {
  /**
   * Creates an instance of AuthService
   * @param config - Service configuration
   * @param config.jwtSecret - Secret key for JWT signing
   * @param config.tokenExpiry - Token expiry duration
   * @param config.refreshTokenExpiry - Refresh token expiry
   */
  constructor(private readonly config: AuthConfig) {}

  /**
   * Authenticates a user and returns access tokens
   * @param credentials - User credentials
   * @returns Authentication result with tokens
   */
  async login(credentials: LoginCredentials): Promise<AuthResult> {
    // Implementation
  }
}

Advanced TypeScript Documentation

Generic Constraints

/**
 * Repository base class for TypeScript entities
 * @template T - Entity type (must extend BaseEntity)
 * @template K - Primary key type (string | number)
 *
 * @remarks
 * Provides CRUD operations with type safety.
 * All methods return Result types for explicit error handling.
 *
 * @example
 * ```typescript
 * class UserRepository extends BaseRepository<User, string> {
 *   async findByEmail(email: string): Promise<Result<User, RepositoryError>> {
 *     // Implementation
 *   }
 * }
 * ```
 */
export abstract class BaseRepository<T extends BaseEntity, K extends string | number> {
  /**
   * Finds an entity by its primary key
   * @param id - Primary key value
   * @returns Result containing entity or error
   */
  abstract findById(id: K): Promise<Result<T, RepositoryError>>;
}

Union Types and Discriminated Unions

/**
 * Represents different types of API responses
 * @variant success - Successful response with data
 * @variant error - Error response with error details
 * @variant pending - Pending response for async operations
 *
 * @example
 * ```typescript
 * type ApiResponse<T> = SuccessResponse<T> | ErrorResponse | PendingResponse;
 *
 * function handleResponse<T>(response: ApiResponse<T>) {
 *   switch (response.status) {
 *     case 'success':
 *       console.log(response.data);
 *       break;
 *     case 'error':
 *       console.error(response.error);
 *       break;
 *     case 'pending':
 *       console.log('Loading...');
 *       break;
 *   }
 * }
 * ```
 */
export type ApiResponse<T> =
  | { status: 'success'; data: T }
  | { status: 'error'; error: ApiError }
  | { status: 'pending'; progress?: number };

Documentation Pipeline Setup

TypeDoc Configuration

{
  "entryPoints": ["src/index.ts"],
  "out": "docs/api",
  "theme": "markdown",
  "readme": "README.md",
  "excludePrivate": true,
  "excludeProtected": false,
  "excludeExternals": true,
  "includeVersion": true,
  "sort": ["source-order"],
  "kindSortOrder": [
    "Document",
    "Project",
    "Module",
    "Namespace",
    "Enum",
    "Class",
    "Interface",
    "TypeAlias",
    "Constructor",
    "Property",
    "Method"
  ],
  "categorizeByGroup": true,
  "categoryOrder": [
    "Authentication",
    "Authorization",
    "*",
    "Other"
  ],
  "navigation": {
    "includeCategories": true,
    "includeGroups": true
  }
}

NPM Scripts

{
  "scripts": {
    "docs:generate": "typedoc",
    "docs:serve": "cd docs && python -m http.server 8080",
    "docs:validate": "node scripts/validate-docs.js",
    "docs:deploy": "npm run docs:generate && ./scripts/deploy-docs.sh"
  }
}

GitHub Actions Workflow

name: Documentation

on:
  push:
    branches: [main, develop]
    paths:
      - 'src/**'
      - 'docs/**'
      - '.github/workflows/docs.yml'

jobs:
  generate-docs:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '18'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Generate TypeDoc
        run: npm run docs:generate

      - name: Validate documentation
        run: npm run docs:validate

      - name: Check for documentation changes
        id: changes
        run: |
          if git diff --quiet HEAD~1 docs/; then
            echo "changed=false" >> $GITHUB_OUTPUT
          else
            echo "changed=true" >> $GITHUB_OUTPUT
          fi

      - name: Commit documentation
        if: steps.changes.outputs.changed == 'true'
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git add docs/
          git commit -m "docs: update generated documentation [skip ci]"
          git push

      - name: Deploy to GitHub Pages
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./docs

Installation

npm install --save-dev typedoc typedoc-plugin-markdown
npm install --save-dev @compodoc/compodoc  # For Angular

TypeDoc Configuration Reference

Configuration Options

Basic Configuration

{
  "entryPoints": ["src/index.ts"],
  "out": "docs/api",
  "theme": "default",
  "name": "My Project",
  "includeVersion": true
}

Advanced Configuration

{
  "entryPoints": ["src/index.ts", "src/cli.ts"],
  "entryPointStrategy": "resolve",
  "out": "docs/api",
  "theme": "markdown",
  "readme": "API.md",
  "name": "My TypeScript Project",
  "includeVersion": true,
  "excludePrivate": true,
  "excludeProtected": false,
  "excludeExternals": true,
  "excludeNotDocumented": false,
  "disableSources": false,
  "disableGit": false,
  "hideGenerator": false,
  "sort": ["source-order"],
  "kindSortOrder": [
    "Document",
    "Project",
    "Module",
    "Namespace",
    "Enum",
    "EnumMember",
    "Class",
    "Interface",
    "TypeAlias",
    "Constructor",
    "Property",
    "Variable",
    "Function",
    "Accessor",
    "Method",
    "Parameter",
    "TypeParameter",
    "TypeLiteral",
    "CallSignature",
    "ConstructorSignature",
    "IndexSignature",
    "GetSignature",
    "SetSignature"
  ],
  "categorizeByGroup": true,
  "categoryOrder": [
    "Authentication",
    "Authorization",
    "Core",
    "Utilities",
    "*",
    "Other"
  ],
  "defaultCategory": "Other",
  "basePath": ".",
  "gitRevision": "main",
  "gitRemote": "origin",
  "navigation": {
    "includeCategories": true,
    "includeGroups": true
  },
  "searchInComments": true,
  "searchInDocuments": true,
  "cleanOutputDir": true,
  "titleLink": "https://myproject.com",
  "navigationLinks": {
    "GitHub": "https://github.com/user/repo",
    "Docs": "https://docs.myproject.com"
  },
  "sidebarLinks": {
    "API Reference": "modules.html",
    "Examples": "examples.html"
  },
  "plugin": ["typedoc-plugin-markdown"],
  "markdownOptions": {
    "hideBreadcrumbs": false,
    "hideInPageTOC": false,
    "indexFormat": "table",
    "entryDocument": "index.md",
    "namedAnchors": true,
    "preserveAnchorCasing": true
  }
}

Theme Options

Default Theme

{
  "theme": "default",
  "customCss": "./assets/custom.css",
  "highlightTheme": "light-plus"
}

Markdown Theme

{
  "theme": "markdown",
  "markdownOptions": {
    "indexFormat": "table",
    "entryDocument": "index.md",
    "hideBreadcrumbs": false,
    "namedAnchors": true
  }
}

Minimal Theme

{
  "theme": "minimal",
  "minimalOptions": {
    "hideMembersSymbol": false,
    "navigationLeaves": ["modules"]
  }
}

Comment Tags

Basic Tags

/**
 * @module MyModule
 * @packageDocumentation
 * @preferred
 * @documentable
 * @hidden
 * @ignore
 * @internal
 * @private
 * @protected
 * @public
 * @readonly
 * @static
 */

Documentation Tags

/**
 * @param name - Parameter description
 * @param name.description - Detailed parameter description
 * @param name.example - Parameter example
 * @returns Return value description
 * @returns.description - Detailed return description
 * @throws Error description
 * @throws.description - Detailed error description
 * @example Code example
 * @example.description - Example description
 * @example.code - Code block
 * @see Related reference
 * @see {@link MyClass} - Linked reference
 * @inheritDoc
 * @override
 * @virtual
 */

Type-Specific Tags

/**
 * @augments ParentClass
 * @extends ParentClass
 * @implements Interface
 * @interface
 * @enum
 * @namespace
 * @constructor
 * @class
 * @abstract
 * @member
 * @method
 * @function
 * @callback
 * @event
 * @fires
 * @listens
 * @mixes MixinName
 * @mixin
 */

Advanced Tags

/**
 * @typeParam T - Generic type parameter
 * @typeparam T - Alias for @typeParam
 * @template T - Another alias for @typeParam
 * @default defaultValue
 * @defaultValue defaultValue
 * @deprecated Since version X.Y.Z
 * @since Version when added
 * @version Current version
 * @author Author name
 * @category Category name
 * @group Group name
 * @summary Short summary
 * @description Long description
 * @remarks Additional remarks
 * @comment Additional comments
 * @todo Todo item
 * @fixme Fixme item
 * @bug Bug reference
 * @issue Issue reference
 * @link https://example.com
 * @tutorial Tutorial reference
 * @guide Guide reference
 * @doc Documentation reference
 * @api API reference
 * @publicApi Public API marker
 * @beta Beta status
 * @alpha Alpha status
 * @experimental Experimental status
 * @stable Stable status
 * @readonlyDoc Readonly documentation
 * @internalDoc Internal documentation
 */

Integration with Build Tools

Webpack Plugin

// webpack.config.js
const TypeDocWebpackPlugin = require('typedoc-webpack-plugin');

module.exports = {
  plugins: [
    new TypeDocWebpackPlugin({
      name: 'My Project',
      mode: 'file',
      out: './docs',
      theme: 'default',
      includeDeclarations: false,
      ignoreCompilerErrors: true,
      version: true
    })
  ]
};

Rollup Plugin

// rollup.config.js
import typedoc from 'rollup-plugin-typedoc';

export default {
  plugins: [
    typedoc({
      out: './docs',
      exclude: '**/*.{test,spec}.ts',
      theme: 'markdown',
      readme: 'API.md'
    })
  ]
};

Vite Plugin

// vite.config.js
import typedoc from 'vite-plugin-typedoc';

export default {
  plugins: [
    typedoc({
      entryPoints: ['src/index.ts'],
      out: 'docs/api',
      theme: 'default'
    })
  ]
};

TypeDoc Plugins

Plugin Development

// typedoc-plugin-example.ts
import { Application, Converter, Context, Reflection } from 'typedoc';

export function load(app: Application) {
  app.converter.on(Converter.EVENT_CREATE_SIGNATURE,
    (context: Context, reflection: Reflection, node?) => {
      // Plugin logic
      if (reflection.kind === ReflectionKind.Method) {
        reflection.comment = reflection.comment || new Comment();
        reflection.comment.tags.push(new Tag('@custom', 'Custom tag'));
      }
    }
  );
}

Popular Plugins

• typedoc-plugin-markdown - Markdown output
• typedoc-plugin-external-module-name - Module naming
• typedoc-plugin-sourcefile-url - Source links
• typedoc-plugin-lerna-packages - Monorepo support
• typedoc-plugin-not-exported - Non-exported members
• typedoc-plugin-internal-external - Internal/external
• typedoc-plugin-rename-defaults - Rename defaults
• typedoc-plugin-pages - Custom pages
• typedoc-plugin-versions - Version selector
• typedoc-plugin-mermaid - Mermaid diagrams

Best Practices

1. Entry Point Strategy

// Use barrel exports in index.ts
export * from './user';
export * from './auth';
export * from './utils';

// Re-export types for better documentation
export type { User, CreateUserDto } from './user/types';

2. Module Documentation

/**
 * @packageDocumentation
 *
 * This module provides authentication and authorization functionality
 * for the application.
 *
 * @remarks
 * Implements JWT-based authentication with refresh tokens.
 *
 * @example
 * ```typescript
 * import { AuthModule } from '@myapp/auth';
 *
 * const auth = new AuthModule(config);
 * ```
 */

export { AuthService } from './auth.service';
export { JwtStrategy } from './jwt.strategy';

3. Type Documentation

/**
 * Represents a user in the system
 * @interface User
 *
 * @category Models
 * @subcategory User Management
 */
export interface User {
  /** Unique identifier */
  id: string;

  /** Email address - must be unique */
  email: string;

  /** User roles for RBAC */
  roles: UserRole[];
}

4. Linking

/**
 * @see {@link UserService} for user operations
 * @see {@link UserRole} for available roles
 * @see https://docs.example.com/users for more info
 * @see [User Guide](../guides/user-management.md)
 */
export interface User {
  // ...
}

Troubleshooting

Common Issues

1. Missing exports

{
  "entryPoints": ["src/index.ts"],
  "excludeNotDocumented": false
}

2. TypeScript errors

{
  "ignoreCompilerErrors": true,
  "skipLibCheck": true
}

3. Slow generation

{
  "exclude": ["**/*.test.ts", "**/*.spec.ts", "node_modules"],
  "disableSources": true
}

4. Large output

{
  "excludePrivate": true,
  "excludeProtected": true,
  "excludeExternals": true
}

Performance Optimization

{
  "cleanOutputDir": false,
  "gitRevision": false,
  "disableSources": true,
  "plugin": ["typedoc-plugin-skip-code"]
}

CI/CD Integration

GitHub Actions

name: Generate Documentation

on:
  push:
    branches: [main]
    paths:
      - 'src/**'
      - 'package.json'
      - 'tsconfig.json'

jobs:
  docs:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '18'

      - name: Install dependencies
        run: npm ci

      - name: Generate documentation
        run: |
          npx typedoc

      - name: Deploy to GitHub Pages
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./docs

GitLab CI

generate_docs:
  stage: documentation
  image: node:18
  script:
    - npm ci
    - npx typedoc
  artifacts:
    paths:
      - docs/
    expire_in: 1 week
  only:
    - main

Validation and Testing

Documentation Coverage

// scripts/check-doc-coverage.ts
import { Application } from 'typedoc';

async function checkCoverage() {
  const app = new Application();

  app.bootstrap({
    entryPoints: ['src/index.ts'],
    tsconfig: 'tsconfig.json'
  });

  const project = app.convert();

  if (!project) {
    throw new Error('Failed to convert project');
  }

  const reflections = project.getReflections();
  const undocumented = reflections.filter(
    r => !r.comment && r.kindOf(ReflectionKind.All)
  );

  console.log(`Documentation coverage: ${
    ((reflections.length - undocumented.length) / reflections.length * 100).toFixed(2)
  }%`);

  if (undocumented.length > 0) {
    console.log('Undocumented items:');
    undocumented.forEach(item => {
      console.log(`- ${item.name} (${ReflectionKind[item.kind]})`);
    });
  }
}

checkCoverage();

Documentation Testing

// tests/documentation.test.ts
describe('Documentation', () => {
  it('should have JSDoc for all public methods', () => {
    const publicMethods = getPublicMethods('./src');
    const documentedMethods = getDocumentedMethods('./src');

    publicMethods.forEach(method => {
      expect(documentedMethods).toContain(method);
    });
  });

  it('should have valid TypeDoc comments', async () => {
    const result = await validateTypeDoc('./src');
    expect(result.errors).toHaveLength(0);
  });
});

Migration Guide

From JSDoc to TypeDoc

1. Install TypeDoc: npm install --save-dev typedoc 2. Create configuration file 3. Update comment syntax if needed 4. Add @category and @group tags 5. Generate and review output 6. Fix any warnings or errors

From Compodoc (Angular)

# Install TypeDoc
npm install --save-dev typedoc

# Update package.json scripts
"docs:generate": "typedoc --angularCompilerOptions tsconfig.json"

From Documentation.js

# Install TypeDoc
npm install --save-dev typedoc

# Convert configuration
# Documentation.js: .documentation.js
# TypeDoc: typedoc.json

Advanced Features

Custom Themes

// custom-theme.ts
import { DefaultTheme } from 'typedoc';

export class CustomTheme extends DefaultTheme {
  constructor(renderer: Renderer) {
    super(renderer);
  }

  getUrls(project: ProjectReflection): UrlMapping[] {
    const urls = super.getUrls(project);
    // Custom URL logic
    return urls;
  }
}

Custom Renderers

// custom-renderer.ts
import { Renderer } from 'typedoc';

export class CustomRenderer extends Renderer {
  constructor() {
    super();
    this.theme = new CustomTheme(this);
  }
}

Event Handling

// typedoc-events.ts
import { Application } from 'typedoc';

const app = new Application();

app.converter.on(Converter.EVENT_BEGIN, () => {
  console.log('Conversion started');
});

app.converter.on(Converter.EVENT_END, () => {
  console.log('Conversion completed');
});

app.renderer.on(Renderer.EVENT_BEGIN, () => {
  console.log('Rendering started');
});

Output Examples

Module Documentation

# Module: user/UserService

## Table of contents

### Classes

- [UserService](user_UserService.UserService.md)

### Interfaces

- [User](user_UserService.User.md)
- [CreateUserDto](user_UserService.CreateUserDto.md)

### Type aliases

- [UserRole](user_UserService.md#userrole)

### Functions

- [validateUser](user_UserService.md#validateuser)

Class Documentation

# Class: UserService

Service for managing user operations

## Hierarchy

- `BaseService`

  ↳ `UserService`

## Implements

- `IUserService`

## Constructors

### constructor

\+ new UserService(`config`: [UserServiceConfig](user_UserService.UserServiceConfig.md)): [UserService](user_UserService.UserService.md)

Creates a new instance of UserService

#### Parameters:

| Name | Type | Description |
| :------ | :------ | :------ |
| `config` | [UserServiceConfig](user_UserService.UserServiceConfig.md) | Service configuration |

## Methods

### createUser

▸ createUser(`data`: [CreateUserDto](user_UserService.CreateUserDto.md)): Promise<[User](user_UserService.User.md)\u003e

Creates a new user

#### Parameters:

| Name | Type | Description |
| :------ | :------ | :------ |
| `data` | [CreateUserDto](user_UserService.CreateUserDto.md) | User creation data |

#### Returns:

Promise<[User](user_UserService.User.md)\u003e

Created user

#### Throws:

- `ValidationError` if data is invalid
- `DuplicateError` if user already exists

Documentation Validation

TypeDoc Plugin for Validation

// typedoc-plugin-validation.js
export function load(app) {
  app.converter.on(
    Converter.EVENT_CREATE_SIGNATURE,
    (context, reflection, node?) => {
      // Check if method has JSDoc
      if (reflection.kind === ReflectionKind.Method) {
        const comment = reflection.comment;
        if (!comment) {
          app.logger.warn(
            `Method ${reflection.name} lacks documentation in ${reflection.parent.name}`
          );
        }
      }
    }
  );
}

ESLint Rules for Documentation

{
  "rules": {
    "jsdoc/require-description": "error",
    "jsdoc/require-param-description": "error",
    "jsdoc/require-returns-description": "error",
    "jsdoc/require-example": "warn",
    "jsdoc/check-alignment": "error",
    "jsdoc/check-indentation": "error",
    "jsdoc/tag-lines": ["error", "any", { "startLines": 1 }]
  }
}

Validation Checklist

• [ ] All public methods have JSDoc comments
• [ ] All parameters have @param descriptions
• [ ] All return values have @returns descriptions
• [ ] Complex functions have @example blocks
• [ ] All @throws documented for error scenarios
• [ ] Cross-references use @see tags
• [ ] ESLint JSDoc rules pass