SOLID principles guide maintainable object-oriented design. Here's how to apply them in TypeScript.
Single Responsibility Principle
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Open/Closed Principle
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Liskov Substitution Principle
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Interface Segregation Principle
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Dependency Inversion Principle
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Applying All Principles
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Best Practices
Applying SOLID:
✓ Start with clean interfaces
✓ Inject dependencies
✓ Favor composition over inheritance
✓ Keep classes focused
Balance:
✓ Don't over-engineer
✓ Apply when complexity warrants
✓ Refactor toward SOLID
✓ Consider maintenance cost
Conclusion
SOLID principles create flexible, maintainable code. Apply them judiciously—not every class needs multiple interfaces or dependency injection. The goal is manageable complexity and easy testing, not architectural purity.