/**
 * Keeps a Popover-API element anchored to its trigger, and reports back when the trigger has been
 * removed from the DOM (e.g. AG Grid row virtualization recycling the row that owns it).
 * @remarks Checks the trigger once per animation frame while started, and repositions only when
 * the trigger or the viewport moved. Events alone miss moves: native `scroll` events don't cross
 * shadow-DOM boundaries, and a grid re-sort moves a row by `transform`, which fires nothing on the
 * rows that didn't change. Callers start it when the popover opens and stop it when it closes.
 * @internal
 */
export declare class AnchoredPopoverPositionTracker {
    private readonly anchor;
    private readonly onReposition;
    private readonly onAnchorDetached;
    private view?;
    private frame?;
    private lastPosition?;
    private readonly check;
    constructor(anchor: HTMLElement, onReposition: () => void, onAnchorDetached: () => void);
    start(): void;
    stop(): void;
}
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