Svelte 5: svelte/reactivity is missing type declarations

[ksmsk]

Describe the problem

Title says all. Reactive implementation of Date and Set doesn't have any type declarations.

Describe the proposed solution

i made workaround for my project like this in app.d.ts since they have basically same interface on the surface.

class NativeSet<T> extends Set<T> {}
class NativeDate extends Date {}

declare module 'svelte/reactivity' {
  class Set<T> extends NativeSet<T> {}
  class Date extends NativeDate {}
}

Importance

would make my life easier

[Conduitry]

I wouldn't expect this to need specific types. We're already defining the classes as class ReactiveDate extends Date etc. What are you doing that's not picking that up?

[ksmsk]

typescript won't find any type declaration for the package because they are not exist in index.d.ts.