Utility Types

Built-in Utility Types

TypeScript includes utility types that transform existing types. These are powerful tools for reducing boilerplate.

Common Utilities

Partial<T> makes all properties optional. Required<T> makes all required. Readonly<T> prevents mutation.

Pick<T, K> selects a subset of properties. Omit<T, K> excludes properties.

Record<K, V> creates an object type with specific key and value types.

Conditional Types

Conditional types let you express type relationships: T extends U ? X : Y. Combined with infer, they enable powerful type transformations.