What are the best practices for using mapped types in TypeScript?

What are the best practices for using mapped types in TypeScript?

Mapped types in TypeScript allow you to create new types by transforming existing ones. Best practices include using them for creating utility types, ensuring type safety, and keeping your code DRY.

Can you give me an example of a mapped type?

Sure! Here's a simple example: type Readonly<T> = { readonly [K in keyof T]: T[K] }; This creates a type that makes all properties of T readonly.

How do mapped types help with code maintainability?

Mapped types promote code reuse and reduce duplication, making it easier to maintain and update your codebase.

Are there any limitations to using mapped types?

Yes, mapped types can only transform properties of existing types and may not work well with complex types like unions or intersections.

What are some common use cases for mapped types?

Common use cases include creating read-only versions of types, partial types for updates, and utility types for libraries.