Navigating the use of property annotations in Mapped Types with remapped keys

After exploring the concept of Key Remapping in TypeScript, as shown in this guide, I am wondering if there is a way to automatically inherit property annotations from the original Type?

type Prefix<Type, str extends string> = {
    [Property in keyof Type as `${str}${Capitalize<string & Property>}`]: Type[Property]
};
 
interface Person {
    /** This is the name. */
    name: string;

    /** This is the age. */
    age: number;

    /** This is the location. */
    location: string;
}
 
interface A extends Prefix<Person, 'alpha'>, Prefix<Person, 'beta'> {};

When hovering over A.alphaName, is it possible for the editor to display

(property) A.alphaName: string. This is the name.
by default and only update annotations where necessary?

Appreciate your insights.

Answer №1

An ongoing issue with TypeScript has been identified and reported on microsoft/TypeScript#50715. Currently, when using key-remapped types, JSDoc comments are not preserved. This problem has been labeled as "Help Wanted" on the official repository, which means that anyone from the community can contribute by submitting pull requests to address it. If you wish to see this feature implemented, consider taking action yourself!

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