Check out the computed typescript types

In my work with TypeScript types, I find myself frequently using Omit, Pick, and similar tools based on other types. While it generally gets the job done, I often struggle with readability when dealing with complex type manipulations.

I am interested in finding a way to visualize the outcome of these type computations.

For example, consider the following code snippet :

type Item = {
  value: string;
  id: string;
}

type TitleItem = {
  title: string;
} & Pick<Item, 'id'>

I am seeking a tool or plugin that can generate:

type TitleItem = {
  title: string;
  id: string;
}

I would prefer a solution within IntelliJ, but I am open to considering any recommended tool :)

(If anyone believes the issue lies within the code itself rather than the tools being used, you may have a point. However, this method helps in linking together types that should evolve collectively, so it's not entirely flawed.)

Answer №1

Explain the concept of:

type Id<T> = { [P in keyof T]: T[P] }

and demonstrate its application with this example :

type TitleItem = Id<{
  title: string;
} & Pick<Item, 'id'>> 

// This results in 
type TitleItem = {
  title: string;
  id: string;
}

Try it out here

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