Property prefix:

[glass dome]

What i want to do is to transform an interface that has some properties to it´s equivalent but all properties should have a prefix (in my case a '$')
Obviously what i did in the playground doesn´t work - but shows what i want to do i guess:

https://www.typescriptlang.org/play/?#code/C4TwDgpgBA8gRgKwgY2AdQE4EMyQwHgBUA+KAXigG8AoKKAbQGkoBLAOygGsIQB7AMyiEoWAM5QA5ABIJAakYBdALQB+AFxCmCgNzUAvrurtgEDPyzJoAVVGmqtKGywBbCGtHAM7AOYAaB1gAJoEYEKKi7p4+-nRY3m5sAK7OcKb61BmgkFBSibYY5LCIKOjYuKb4NqbEGQD0tbn5dKIAFryJADaBjrwA7lCpUKK8rsAtPlAdLNxUUk6ukV5sfjkiwaHhi9E5cQnJqRh6QA

I think this is not possible - but it´s worth asking.
Thanks, dudie

[gleaming tendon]

@glass dome Here's a shortened URL of your playground link! You can remove the full link from your message.

dude0220#0

Playground Link

Preview:```ts
type ObjectWrapper<T> = {
[K in keyof T as '$'+K]-?: T[K];
};

interface User {
name:string,
address:string,
age:number
}

type $user = ObjectWrapper<User>

//$user should now be something like {$name:string, $ address:string, $age:number}```

You can choose specific lines to embed by selecting them before copying the link.

[faint gazelle]

ts doesn't do type-level runtime operators, you can use a template type instead

[gleaming tendon]

chris.sophos#0

Playground Link

Preview:ts type ObjectWrapper<T> = { [K in keyof T & string as `$${K}`]-?: T[K] } ...

[faint gazelle]

(can't stringify a symbol, hence the & string)

not sure if that breaks it being a homomorphic mapping actually. might have to use a conditional instead

[glass dome]

Oh wow, i try that, thanks ❤️

That works. Thank you Chris!