Mastering TypeScript mapped types

The article explores the concept of mapped types in TypeScript, emphasizing their utility in maintaining DRY (Don't Repeat Yourself) code by deriving one type from another and ensuring they remain synchronized. It delves into foundational concepts such as indexed access types, index signatures, union types, and the keyof type operator, which are pivotal for creating mapped types. The text provides examples, including real-world applications like managing configuration permissions and formatting device properties. It also discusses custom utility types such as Partial<Type>, Readonly<Type>, and Pick<Type, Keys>, showcasing how they streamline coding by offering flexibility and enhancing type safety. By leveraging these mapped types, developers can automate the synchronization of related types, reducing the potential for bugs and improving code maintainability.