import { type PanelOptions } from './sidebar';
import type { Zine } from '../zine';
/**
 * The document's table of contents beside the book.
 *
 * One row per heading, nested entries indented under their parent. Clicking a row turns to the
 * page it points at; a heading whose destination could not be resolved is still listed, just not
 * clickable. Unlike the thumbnail rail this is a single column — headings are text, and a second
 * column would only make them narrower.
 */
export declare class Outline {
    #private;
    /** The panel's themed root, so the toolbar can stamp its colour scheme. */
    readonly root: HTMLElement;
    constructor(zine: Zine, container: HTMLElement, options?: PanelOptions);
    destroy(): void;
}