/**
 * Toggle scroll blocking.
 * @param  active - Current state.
 * @param  unblockScroll - Unblock scroll function.
 * @param  element - Element to block scroll.
 * @return New unblock scroll function or null.
 */
export default function toggleScrollBlock(active: boolean, unblockScroll: () => void, element?: HTMLElement): () => void;
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