/**
 * Number Utils
 * A number is a js-number, e.g. 5.12
 */
export declare const DEFAULT_TOLERANCE = 1e-9;
export declare function is(x: any): boolean;
export declare function equal(x: number | null | undefined, y: number | null | undefined, tolerance?: number): boolean;
export declare function sign(x: number, tolerance?: number): number;
export declare function isInteger(num: number, tolerance?: number): boolean;
export declare function round(num: number, precision: number): number;
export declare function roundTo(num: number, increment: number): number;
export declare function floorTo(num: number, increment: number): number;
export declare function ceilTo(num: number, increment: number): number;
/**
 * toFraction
 *
 * Returns a [numerator, denominator] array rational representation
 * of `decimal`
 *
 * See http://en.wikipedia.org/wiki/Continued_fraction for implementation
 * details
 *
 * toFraction(4/8) => [1, 2]
 * toFraction(0.66) => [33, 50]
 * toFraction(0.66, 0.01) => [2/3]
 * toFraction(283 + 1/3) => [850, 3]
 */
export declare function toFraction(decimal: number, tolerance?: number, maxDenominator?: number): [number, number];