/**
 * Locks page scroll on `document.body` while a tour is active, compensating
 * for the scrollbar's width so hiding it does not shift the layout.
 *
 * Mirrors the setup/teardown shape of {@link "./focus-guard".FocusGuard}:
 * `activate` captures and overrides the body's inline scroll-affecting
 * styles, `deactivate` restores exactly what was there before.
 */
export declare class ScrollLock {
    private document;
    private previousOverflow;
    private previousPaddingRight;
    private active;
    activate(document: Document | null | undefined): void;
    deactivate(): void;
    private scrollbarWidth;
    private computedPaddingRight;
}