import { LitElement } from '../LitElement.ts';
import { BaseController, TrackKeyResolution } from './types.ts';
/**
 * A combination of trackPropertyKey() and trackPropKey(). For usage when
 * you want to track a property, but don't know if it will be defined with the
 * \@property() decorator or not
 */
export declare const trackKey: <T>(hostsCandidates: ((BaseController | LitElement)[] | BaseController | LitElement) | undefined, onResolved: (resolution: TrackKeyResolution | undefined) => void, defaultValue: T) => T;