/**
 * Find the greatest common denominator between two numbers.
 * @param numerator Fraction numerator.
 * @param denominator Fraction denominator.
 */
export declare function greatestCommonDenominator(numerator: number, denominator: number): number;
/**
 * Reduce a fraction by finding the Greatest Common Divisor and dividing by it.
 * @param numerator Fraction numerator.
 * @param denominator Fraction denominator.
 */
export declare function reduceFraction(numerator: number, denominator: number): Array<number>;