Transforming Types in TypeScript with Utility Types

TypeScript's built-in utility types (Partial, Required, Omit, Pick, Readonly, Record) allow developers to derive new types from existing ones without duplication. The post covers each with code examples, then introduces the third-party library type-fest, which extends these with deeper or stricter variants: Except (strict Omit), Merge, PartialDeep, ReadonlyDeep, and Mutable.