Decorators modify classes and their members at design time. Here's how to use them effectively.
Enabling Decorators
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Class Decorators
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Method Decorators
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Property Decorators
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Parameter Decorators
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Accessor Decorators
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Real-World Patterns
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Best Practices
Design:
✓ Keep decorators focused
✓ Use factories for configuration
✓ Compose multiple decorators
✓ Document decorator behavior
Performance:
✓ Avoid heavy computation in decorators
✓ Use lazy initialization
✓ Cache metadata lookups
✓ Consider runtime cost
Testing:
✓ Test decorated and undecorated
✓ Mock decorator effects
✓ Test decorator combinations
✓ Verify metadata
Conclusion
Decorators provide powerful metaprogramming capabilities in TypeScript. Use them for cross-cutting concerns like logging, validation, and dependency injection. Keep decorators simple and composable, and remember they run at class definition time, not instantiation.