/**
 * Utilities for numbers of all types. Use this module by importing from
 * `@sirpepe/shed/number`.
 */
/**
 * Returns `true` if `x` is a real number (ie finite and not NaN), be that a
 * BigInt or plain number.
 *
 * Examples:
 *
 * ```javascript
 * let yup1 = isReal(7); // true
 * let yup2 = isReal(-1n); // true
 * let nope1 = isReal(NaN); // false
 * let nope2 = isReal(Infinity); // false
 * let nope3 = isReal("Hello"); // false
 * ```
 */
export declare function isReal(x: unknown): boolean;
/**
 * Round a float value to `digits` decimal places. Examples:
 *
 * ```javascript
 * roundFloat(1.555, 2); // > 1.56
 * roundFloat(1.005, 2); // 1.01
 * roundFloat(2 / 3, 4); // 0.6667
 * ```
 */
export declare function roundFloat(value: number, digits: number): number;
/**
 * Round up a float value to `digits` decimal places.
 */
export declare function ceilFloat(value: number, digits: number): number;
/**
 * Round down a float value to `digits` decimal places.
 */
export declare function floorFloat(value: number, digits: number): number;
export declare function stringify(number: number, charset: string): string;