import { LitElement } from '../LitElement.ts';
import { ControllerLifecycleMethods } from './types.ts';
export declare const isController: (value: unknown) => value is ControllerLifecycleMethods;
/**
 * Checks if the argument is a promise by checking if it has a `then` method.
 */
export declare const isPromise: <T>(arg: Promise<T> | T) => arg is Promise<T>;
/**
 * Get the number of controllers current component has. Can be used to get a
 * unique id for each controller.
 */
export declare const getControllersCount: (component: LitElement) => number;