/**
 * Adds a lock on content scrolling on a DOM-element.
 *
 * @param container Link on DOM-element. Default: `document.body`
 */
export declare function lock(container?: HTMLElement | null): void;
/**
 * Removes the lock on content scrolling on a DOM-element.
 *
 * @param container Link on DOM-element. Default: `document.body`
 */
export declare function unlock(container?: HTMLElement | null): void;