/**
 * Convert input color string to normalized 6-digit hex color.
 *
 * Supported formats:
 * - #fff
 * - #ffffff
 * - rgb(r, g, b)
 * - rgba(r, g, b, a)
 *
 * Unsupported/invalid formats return:
 * #000000
 */
export declare const toHashColor: (color: string) => string;
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