Utility Types
TypeScript ships utility types that transform existing types. Common ones are Partial, Pick, and Readonly.
- Partial makes every property optional
- Pick keeps only the named properties
- Readonly blocks reassigning properties
interface User { id: number; name: string }
type Draft = Partial<User>;
type OnlyId = Pick<User, "id">;Utility types save you from rewriting a shape by hand when you need a small variation.
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