Design Patterns

Proven architectural patterns for building maintainable, extensible, and testable TypeScript codebases. All 22 Gang of Four patterns with practical implementations.

When to Apply

Reference these patterns when:

• Solving recurring architectural problems
• Refactoring tightly coupled code
• Building plugin/extension systems
• Making code more testable via dependency injection
• Reviewing PRs with architectural concerns
• Choosing between inheritance and composition

Pattern Categories

Creational Patterns