import { System } from '../system';
import { IPositionObserverEntry, PositionObserver, PositionObserverCallback } from '../types/global/PositionObserver';
export declare class PositionObserver_ implements PositionObserver {
    private _system;
    private _callback;
    private _unlisten;
    private _abort;
    constructor(system: System, callback: PositionObserverCallback);
    observe(element: HTMLElement): IPositionObserverEntry;
    disconnect(): void;
}
