TypeScript provides utility types transforming existing types into new ones. Partial makes all properties optional. Pick selects specific properties. Omit removes properties. These utilities reduce type definition duplication.
Essential Utility Types
Partial<T> makes all properties optional for partial updates. Required<T> makes all properties required. Readonly<T> prevents mutation. Record<K,V> creates object types with specified keys and values.
- Use Partial for update operations accepting subset of properties
- Apply Pick to create focused types from larger interfaces
- Use Omit to exclude properties when extending types
- Leverage ReturnType to extract function return types
- Combine utilities for complex type transformations
Advanced Combinations
Combine utility types for sophisticated transformations. Pick with Partial creates optional subsets. Omit with Required makes specific properties mandatory. Master these combinations for expressive type definitions.