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.