TypeScript's type system is powerful enough to catch bugs at compile time that would otherwise reach production. Here are advanced patterns that make your code safer and more expressive.
Discriminated Unions#
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Template Literal Types#
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Conditional Types#
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Mapped Types#
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Type-Safe Builder Pattern#
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Type-Safe API Client#
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Branded Types#
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Type Guards#
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Utility Types#
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Best Practices#
DO:
✓ Use discriminated unions for state
✓ Prefer type inference where clear
✓ Use branded types for domain safety
✓ Write custom type guards
✓ Use template literals for patterns
DON'T:
✗ Overuse 'any' or 'as'
✗ Create overly complex types
✗ Ignore compiler errors
✗ Skip type documentation
Conclusion#
Advanced TypeScript patterns encode business logic in the type system. Discriminated unions handle state, branded types prevent mixing, and conditional types enable flexible APIs.
The goal is catching bugs at compile time—before they reach production.