/**
 * Returns a NEW array = `existing` followed by every row in `incoming` whose
 * `id` is not already present. Stable on identity/order of `existing`. Pure.
 */
export declare function dedupeById<T extends {
    id?: any;
}>(existing: T[], incoming: T[]): T[];
export interface UseInfiniteScrollOptions {
    /** Fired when the sentinel scrolls into view and loading is enabled. */
    onLoadMore: () => void;
    /** When true, the observer is inert (no more pages, or a load in flight). */
    disabled?: boolean;
    /** Pixels of pre-fetch margin below the viewport. Default 200. */
    rootMargin?: number;
}
export interface InfiniteScrollRefs<R extends HTMLElement = HTMLDivElement, S extends HTMLElement = HTMLDivElement> {
    rootRef: React.RefObject<R | null>;
    sentinelRef: React.RefObject<S | null>;
}
/**
 * IntersectionObserver-backed infinite scroll. Attach `rootRef` to the
 * scrollable container and `sentinelRef` to a small element at its bottom. The
 * latest `onLoadMore`/`disabled` are read through a ref so the observer isn't
 * torn down and rebuilt on every render.
 */
export declare function useInfiniteScrollSentinel<R extends HTMLElement = HTMLDivElement, S extends HTMLElement = HTMLDivElement>({ onLoadMore, disabled, rootMargin, }: UseInfiniteScrollOptions): InfiniteScrollRefs<R, S>;
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