Expose Derived type

[int0h]

I think it might be a good idea to expose this type.

Potential use-case:

import { trait, derive, derived, Derived } from "@traits-ts/core"

const HasA = trait(B => class extends B {
    a = 'a';
});

function log(b: Derived<typeof HasA>) {
    console.log(b.a);
}

Similar can be achieved like that:

function logWithCheck(b: any) {
    if (derived(b, HasA)) {
        console.log(b.a);
    } else {
        //throw maybe?
    }
}

But then the function call would be untyped and impossible to do compile time check.

If the same can be solved somehow else I'd appreciate advice and updating docs (if it's not there yet)

[int0h]

I exposed it here: #8