/** `box-shadow`-syntax parser. Layers become SVG filter passes built from the
 *  merged liquid silhouette, so one shadow hugs the goo through every state. */
export interface ShadowLayer {
    x: number;
    y: number;
    blur: number;
    spread: number;
    color: string;
    /** Inner shadow/highlight: painted INSIDE the liquid edge, following the
     *  merged silhouette exactly like the outer passes. */
    inset: boolean;
}
export declare function parseShadow(input?: string | null): ShadowLayer[];