/**
 * Converts a hex color to RGB channels.
 *
 * @param {string} hexColor - The hex color string.
 * @returns {string} - The RGB channels string.
 * @throws {Error} - Throws an error if the hex color is invalid.
 *
 * @example
 * const rgbChannel = hexToRgbChannel("#C8FAD6");
 * console.log(rgbChannel); // "200 250 214"
 */
declare function hexToRgbChannel(hexColor: string): string;
/**
 * Converts a hex palette color to RGB channels palette.
 *
 * @typedef {Object} InputPalette - The input palette object with hex color strings.
 * @property {string} lighter - The lighter hex color.
 * @property {string} light - The light hex color.
 * @property {string} main - The main hex color.
 *
 * @typedef {Object} ChannelPalette - The output palette object with RGB channels.
 * @property {string} lighterChannel - The lighter RGB channels.
 * @property {string} lightChannel - The light RGB channels.
 * @property {string} mainChannel - The main RGB channels.
 *
 * @param {InputPalette} hexPalette - The input palette object.
 * @returns {ChannelPalette} - The output palette object with RGB channels.
 *
 * @example
 * const palette = createPaletteChannel({
 *   lighter: "#C8FAD6",
 *   light: "#5BE49B",
 *   main: "#00A76F",
 * });
 * console.log(palette);
 * // {
 * //   lighter: "#C8FAD6",
 * //   light: "#5BE49B",
 * //   main: "#00A76F",
 * //   lighterChannel: "200 250 214",
 * //   lightChannel: "91 228 155",
 * //   mainChannel: "0 167 111",
 * // }
 */
type InputPalette = Record<string, string | undefined>;
type ChannelPalette<T extends InputPalette> = T & {
    [K in keyof T as `${string & K}Channel`]: string;
};
declare function createPaletteChannel<T extends InputPalette>(hexPalette: T): ChannelPalette<T>;
declare function varAlpha(color: string, opacity?: string | number): string;

export { type ChannelPalette, type InputPalette, createPaletteChannel, hexToRgbChannel, varAlpha };