TypeScript Utility Types Complete Guide

Typescript Utility types Utility types are helpers that typescript provides to make common type transformations easier. For example if you have a Todo type type Todo = { readonly id : number ; title : string ; description ?: string ; category ?: string ; status : " done " | " in-progress " | " todo " ; readonly createdAtTimestamp : number ; updatedAtTimestamp : number | null ; }; And you want to create a TodoPreview type that only has title , status properties. Instead of creating a new type by hardcoding it, you can use type TodoPreview = Pick < Todo , " title " | " status " > ; // type TodoPreview = { title: string; status: TaskStatus } You might think "So why don't I just hardcode it?" While hardcoding might work for small projects, it quickly becomes a Maintenance Nightmare in professional environments for two main reasons: Intent & Readability : As in larger types you have to manually compare the two types to figure out how they are related while Utility types make the relationshi