import type { Ref } from '@stacksjs/stx';
/**
 * Extend a ref with additional properties.
 *
 * @param ref - The ref to extend
 * @param extend - The properties to add
 * @returns The extended ref
 */
export declare function extendRef<T, E extends Record<string, any>>(r: Ref<T>, extend: E): Ref<T> & E;