import type { ReactiveController, ReactiveControllerHost } from 'lit';
/**
 * We can have any number of components open at a time, all of which lock scroll.
 * Consider multiple modals being open, plus some popouts, etc.
 *
 * So we need some bookkeeping to know when to unlock scroll...
 *
 * But we can't simply keep a count of how many components are open,
 * since a misbehaving component may call lockScroll() multiple times.
 *
 * Nor can we rely on the first component to call lockScroll() to be the last to unlockScroll(),
 * since we cannot guarantee order of operations.
 *
 * Therefore, we track instances of ScrollbarController in a Set,
 * and only unlock scroll when the set is empty.
 *
 * We also need to be careful to restore any styles that were there
 * before we locked scroll.
 */
export declare class ScrollbarController implements ReactiveController {
    private static locks;
    private static resets;
    constructor(host: ReactiveControllerHost);
    hostDisconnected(): void;
    lockScroll(): void;
    unlockScroll(): void;
    private static setStyle;
}