export declare class PositionObserver {
    positionObserverCallback: (data: {
        x: number;
        y: number;
        target: Element;
        outOfViewport: boolean;
        rootBounds: DOMRectReadOnly | null;
    }) => void;
    thresholdList: number[];
    intersectionObserver?: IntersectionObserver;
    constructor(positionObserverCallback: (data: {
        x: number;
        y: number;
        target: Element;
        outOfViewport: boolean;
        rootBounds: DOMRectReadOnly | null;
    }) => void, thresholdFraction?: number);
    observe(targetElement: Element): void;
    viewportCallback(e: IntersectionObserverEntry[]): void;
    intersectionObsCallback(e: IntersectionObserverEntry[]): void;
    disconnect(): void;
    constructBoxWindow(targetBounds: DOMRectReadOnly, rootBounds: DOMRectReadOnly): {
        left: number;
        top: number;
        right: number;
        bottom: number;
    };
    getMargins(windowDimensions: {
        left: number;
        top: number;
        right: number;
        bottom: number;
    }, rootBounds: DOMRectReadOnly | null): string;
}