@dualjack/svelte-tools/dist/tools/computed/computed.svelte.js

### Why? Because runes are not safe to toss around by design.

export function computed(cb, options) {
    const { debounceDelay = 0, } = options ?? {};
    //  TODO - debounce logic.
    let derived = $derived.by(cb);
    return {
        get current() { return derived; }
    };
}