/**
 * @param {Number} p
 * @param {Number} q
 * @param {Number} t
 * @return {Number}
 */
export declare function hue2rgb(p: number, q: number, t: number): number;
/**
 * Convert a value ∈ [0, 255] to hex
 */
export declare function hexify(value: number): string;
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