/**
 * Converts a scrollThreshold value into a CSS rootMargin string for IntersectionObserver.
 *
 * scrollThreshold represents "how far down the page before triggering" (e.g. 0.8 = 80%).
 * IntersectionObserver's rootMargin extends the root's bounding box so the sentinel is
 * detected before it actually enters the visible area.
 *
 * For a percentage threshold (e.g. 0.8 → 80%):
 *   remaining = 100% - 80% = 20% → rootMargin bottom = "20%"
 *
 * For a pixel threshold (e.g. "120px"):
 *   rootMargin bottom = "120px"
 *
 * Note: rootMargin percentages are relative to the root element's own dimensions, not
 * scrollHeight. This is a close approximation of the original scroll-event behavior and
 * is an intentional tradeoff for the performance benefit.
 *
 * For inverse mode the margin is applied to the top instead of the bottom.
 */
export declare function buildRootMargin(scrollThreshold: number | string, inverse: boolean): string;
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