/**
 * Turns an old-fashioned css hex color value into a rgb color value.
 *
 * If you specify an alpha value, you'll get a rgba() value instead.
 *
 * @param color - The hex value to convert. ('123456'. '#123456', ''123', '#123')
 * @param alpha - An alpha value to apply. (optional) ('0.5', '0.25')
 * @returns An rgb or rgba value. ('rgb(11, 22, 33)'. 'rgba(11, 22, 33, 0.5)')
 */
export declare function hexToRgba(color: string, alpha?: number | string): string;
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