import type { RGBColour } from "./types";
/**
 * Converts a colour in the RGB format to Hexadecimal.
 * It accepts an option Alpha channel `A`
 * @param {RGBColour} colour - An object representing RGB Colour.
 * @param {number} colour.R - A number between 0 and 255 to describe the Red colour channel
 * @param {number} colour.G - A number between 0 and 255 to describe the Green colour channel
 * @param {number} colour.B - A number between 0 and 255 to describe the Blue colour channel
 * @param {number} colour.A - An optional number between 0 and 1 to describe the Alpha colour channel
 * @returns - An hexadecimal string
 */
export declare function convertRGBtoHex({ R, G, B, A }: RGBColour): string;