import type { PartialRequired, Sticky, StickyOptions } from './sticky';
export default class StickyImpl implements Sticky {
    element: HTMLElement;
    options: PartialRequired<StickyOptions, 'marginTop'>;
    private $$offsetTop;
    private readonly $$onUpdate;
    private readonly $$restoreStyles;
    private readonly $$sentinel;
    private $$resizeObserver?;
    private $$stuckObserver?;
    private $$destroyed;
    constructor(element: HTMLElement, options?: StickyOptions, activate?: boolean, onUpdate?: () => void);
    get offsetTop(): number;
    set offsetTop(value: number);
    /**
     * 固定線が動くたびに監視域を張り直す。sentinel がその線より上へ
     * 抜けていれば、要素は線に貼り付いている
     */
    private watchStuckState;
    update(): void;
    destroy(): void;
}