import type { BaseConstructor } from '../Base/index.js';
type ImportWhenIdleOptions = {
    timeout?: number;
};
/**
 * Import a component when user is idle.
 *
 * @template {BaseConstructor} T
 * @param {() => Promise<T|{default:T}>} fn
 *   The import function.
 * @param {ImportWhenIdleOptions} [options]
 *   The time to wait before triggering the callback if never idle.
 * @return {Promise<T>}
 * @link https://js-toolkit.studiometa.dev/api/helpers/importWhenIdle.html
*/
export declare function importWhenIdle<T extends BaseConstructor = BaseConstructor>(fn: () => Promise<T | {
    default: T;
}>, { timeout }?: ImportWhenIdleOptions): Promise<T>;
export {};