/**
 * ForKeyed(key, generator, mapper)
 *
 * A keyed variant of For. The generator returns an array of objects; each
 * object must have a unique value at `key`. The mapper is called exactly once
 * per unique key and its returned DOM node is reused for the lifetime of that
 * key — even if the object moves position in the array.
 *
 * The Computed only drives structural changes: insertion, removal, and
 * reordering. Internal reactivity for each item is the mapper's own
 * responsibility (e.g. its own Computed / signals set up inside the mapper).
 *
 * Usage:
 *   ForKeyed(
 *     "id",
 *     () => proxy as { id: string }[],
 *     (item) => buildItemElement(item.id, proxy[indexOf(item.id)])
 *   )
 */
export declare function ForKeyed<K extends PropertyKey, T extends Record<K, string | number>>(key: K, generator: (() => T[]) | {
    get(): T[];
}, mapper: (item: T) => JSX.Element): {
    to_html(): Element;
};
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