import { Palette } from '../palette.js';
import { Swatch } from '../swatch.js';
/**
 * @internal
 */
export declare function neutralLayer2Index(palette: Palette, luminance: number, layerDelta: number, fillRestDelta: number, fillHoverDelta: number, fillActiveDelta: number): number;
/**
 * @internal
 */
export declare function neutralLayer2(palette: Palette, luminance: number, layerDelta: number, fillRestDelta: number, fillHoverDelta: number, fillActiveDelta: number): Swatch;