export interface ArticleOutlineEntry {
    key: number;
    level: number;
    title: string;
    element: HTMLElement;
    offset: number;
}
/** Observe the actual reader/editor headings, excluding code and ordinary bold text.
 * No polling or network reads. Scroll work is one animation frame and a binary search. */
export declare function useArticleOutline(body: HTMLElement | null, articleKey: string, positions: Map<string, number>): {
    entries: ArticleOutlineEntry[];
    active: number | undefined;
    navigate: (entry: ArticleOutlineEntry) => void;
};
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