import React from 'react';
export interface ScrollProgressSection {
    id: string;
    label: string;
}
/** Which side of the rail the section list opens toward. */
export type ScrollProgressPlacement = 'right' | 'left';
export interface ScrollProgressProps extends Omit<React.HTMLAttributes<HTMLDivElement>, 'onSelect'> {
    /** 0-100. The caller computes this from whatever it is tracking — a
     *  window scroll fraction, a custom scroll container, a reading-time
     *  estimate. This component has no opinion on the source. */
    progress: number;
    sections: ScrollProgressSection[];
    /** The section the rail's heavier tick and the panel's selected row point
     *  to. Also the caller's to compute — see `progress`. */
    activeId?: string;
    /** Fired when a row is chosen. The component does not scroll anywhere
     *  itself; matching Menu, it reports the choice and lets the caller decide
     *  what "select this section" means for their page. */
    onSelect?: (id: string) => void;
    /** Which way the section list opens. `right` suits a rail on the left of the
     *  content; a rail against the right edge of the page needs `left`, or the
     *  open list runs off the screen. */
    placement?: ScrollProgressPlacement;
    /**
     * The rail button's name — "Reading progress: 32%. Currently in Usage.
     * Activate to jump to a section." in English. Receives the rounded
     * percentage and the active section's label, when there is one.
     */
    triggerLabel?: (progress: number, section?: string) => string;
}
/**
 * The compact rail is the disclosure trigger. It is a real `<button>`, so a
 * keyboard user reaches it by Tab and opens it the same way as any button —
 * Enter or Space — no `:focus-within` trick required; a mouse user can also
 * just hover it. Built as a WAI-ARIA Disclosure (`aria-expanded` +
 * `aria-controls`) rather than a menu: see the CSS header for why
 * `role="menu"` is deliberately not used here.
 *
 * Closes on outside pointerdown and on Escape — the minimum a disclosure
 * needs to not trap the page once opened, not a full popover/focus-trap
 * implementation.
 */
export declare const ScrollProgress: React.ForwardRefExoticComponent<ScrollProgressProps & React.RefAttributes<HTMLDivElement>>;
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