/**
 * Single shared ResizeObserver for all overflow lists. The browser drains
 * microtasks between separate observer callbacks, so per-instance observers
 * cannot share one read/write batch — one observer delivers every entry in a
 * single callback, letting all instances enqueue into the same flush. It also
 * fires pre-paint: a measurement scheduled here lands before the frame paints.
 */
/** Called when the observed element resizes (including display:none toggles). */
export interface OverflowResizeHandler {
    (): void;
}
export declare const observeOverflowResize: (element: Element, handler: OverflowResizeHandler) => (() => void);