/**
 * @file /src/utils/colour.ts
 * @name Colour
 * @description Utility functions for working with colours.
 */
/**
 * Checks if the given paper colour is a valid colour format.
 *
 * This function validates the paper colour by checking if it is in
 * hexadecimal, RGB, or RGBA format.
 *
 * @param paperColour - The colour string to validate.
 * @returns `true` if the colour is valid, otherwise `false`.
 */
export declare const isValidColour: (paperColour: string) => boolean;
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