TypeScript's utility types enable powerful type transformations. Here's how to use and create them effectively.
Built-in Utility Types
Partial and Required
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Pick and Omit
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Record
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Readonly and Mutable
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ReturnType and Parameters
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Advanced Patterns
Conditional Types
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Template Literal Types
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Mapped Types
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Discriminated Unions
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Builder Pattern Types
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Custom Utility Types
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Best Practices
Usage:
✓ Use built-in types when possible
✓ Create reusable custom types
✓ Document complex type transformations
✓ Keep types readable
Performance:
✓ Avoid deeply nested conditionals
✓ Use type aliases for readability
✓ Consider type inference limits
✓ Test with edge cases
Organization:
✓ Group related utility types
✓ Export from dedicated files
✓ Version breaking changes
✓ Add JSDoc comments
Conclusion
TypeScript's utility types enable powerful type transformations. Master the built-in types first, then combine them for complex scenarios. Well-designed types catch errors early and improve code documentation.