/** Parse #rgb / #rrggbb / rgb() / hsl() into 0–255 channels; null for anything else. */
export declare function parseColor(input: string): [number, number, number] | null;
/** Relative luminance (WCAG), 0–1. Unparseable colours count as mid-grey. */
export declare function luminance(color: string): number;
export declare const DARK_INK = "#1E1A33";
export declare const LIGHT_INK = "#F7F5F2";
/** Face ink for a body colour: dark ink, or light ink on a dark body. */
export declare function autoInk(color: string): string;
/**
 * A shade of a colour: `dl` moves the lightness (−1..1), `ds` the
 * saturation. Darker shades get a touch more saturation so they stay
 * rich instead of going grey, the way a painted surface falls into shadow.
 */
export declare function shade(color: string, dl: number, ds?: number): string;