import { ControlStateChangeListenerCallback, ControlStateChangeListener as ControlStateChangeListenerDefinition } from '.';
export declare class ControlStateChangeListener implements ControlStateChangeListenerDefinition {
    private _observer;
    private _control;
    private _observing;
    private readonly _states;
    constructor(control: UIControl, states: string[], callback: ControlStateChangeListenerCallback);
    start(): void;
    stop(): void;
}