/**
 * Function converts hex code to rgba (or rgb) values in an array.
 * @param {string} hex 6 character hex code to convert
 * @param {number} opacity Optional opacity value to use. If not provided, alpha value returned will be 1.
 * @returns rgba values in rgba notation
 * @example hexToRgba('#FFFFFF') // rgba(255, 255, 255, 1)
 * @example hexToRgba('#FFFFFF', 0.5) // rgba(255, 255, 255, 0.5)
 */
export declare const hexToRgba: (hex: string, opacity?: number) => string;