TypeScript 6.0 introduces powerful new features for type-level programming that enable more sophisticated type patterns and better developer experience.

New utility types

The standard library gains several new utility types:

• Exact types for structural equality
• Discriminated unions with better inference
• Template literal types with enhanced capabilities
• Key remapping in mapped types

Advanced conditional types

TypeScript 6.0 improves conditional type inference:

• Distributive conditional types work more predictably
• Template literal inference enables string parsing
• Recursive conditional types for complex patterns
• Variance annotations for better generics

Design patterns

These new type features enable powerful patterns:

• Builder pattern with type safety
• Strategy pattern with discriminated unions
• Visitor pattern with conditional types
• Fluent interfaces with method chaining types