/// <reference types="svelte" />
import type { Stores, StoresValues } from 'svelte/store';
/**
 * A utility function that creates an effect from a set of stores and a function.
 * The effect is automatically cleaned up when the component is destroyed.
 *
 * @template S - The type of the stores object
 * @param stores - The stores object to derive from
 * @param fn - The function to run when the stores change
 * @returns A function that can be used to unsubscribe the effect
 */
export declare function effect<S extends Stores>(stores: S, fn: (values: StoresValues<S>) => (() => void) | void): () => void;