The override keyword explicitly marks methods that override base class methods. Here's how to use it safely.
Basic Usage
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Enable noImplicitOverride
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Catching Refactoring Errors
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Abstract Methods
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Protected Methods
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Accessors
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Constructor Patterns
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Multiple Inheritance Levels
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With Mixins
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Generic Classes
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Event Handlers
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Testing with Override
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Best Practices
Usage:
✓ Enable noImplicitOverride
✓ Always use override when intended
✓ Call super when needed
✓ Match signature exactly
Benefits:
✓ Catches refactoring errors
✓ Documents intent clearly
✓ Prevents accidental overrides
✓ IDE support and autocomplete
Patterns:
✓ Template method pattern
✓ Hook methods
✓ Testing with mocks
✓ Framework extensions
Avoid:
✗ Overriding without super when needed
✗ Changing method semantics
✗ Deep inheritance hierarchies
✗ Overriding to do nothing
Conclusion
The override keyword makes method overriding explicit and catches errors when base methods are renamed or removed. Enable noImplicitOverride in your tsconfig for the best experience. Use it consistently when extending classes to maintain a clear inheritance hierarchy and prevent subtle bugs during refactoring.