/**
 * --------------------------------------------------------------------------
 *  Function: hexToRGB
 * --------------------------------------------------------------------------
 *  Convert a hex colour to an RGB colour.
 *
 *  @param {string} hex - The hex colour to convert.
 *  @param {number} alpha - The alpha value to apply.
 *  @returns {string} - The converted RGB colour.
 * --------------------------------------------------------------------------
 */
export declare const hexToRGB: (hex: string, alpha: number) => string;
/**
 * --------------------------------------------------------------------------
 *  Function: isValidHex
 * --------------------------------------------------------------------------
 *  Check if a hex colour is valid.
 *
 *  @param {string} hex - The hex colour to check.
 *  @returns {boolean} - The result of the check.
 * --------------------------------------------------------------------------
 */
export declare const isValidHex: (hex: string) => boolean;