import React from 'react';
/**
 * SidebarRailFX — an opt-in ambient backdrop that lives *behind* the icon rail.
 *
 * mode:
 *   'off'    — render nothing (default; zero cost).
 *   'aurora' — lightweight CSS-only drifting aurora (works everywhere).
 *   'webgpu' — a GPU shader aurora when the browser supports WebGPU,
 *              gracefully falling back to the CSS aurora otherwise.
 *
 * It is purely decorative: `pointer-events: none`, sits at `z-index: -1` inside
 * the rail's stacking context (above the card background, below the icons), and
 * honors `prefers-reduced-motion` by holding a static frame.
 */
export type RailFxMode = 'off' | 'aurora' | 'webgpu';
interface SidebarRailFXProps {
    mode?: RailFxMode;
    /** Brand color as an `r,g,b` triplet in 0..1. Defaults to a calm indigo. */
    rgb?: [number, number, number];
}
export declare const SidebarRailFX: React.FC<SidebarRailFXProps>;
export default SidebarRailFX;
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