/**
 * @module helper.number
 */
/**
 * type of operator for `calculate`.
 */
export declare type CalculateNumberOperator = '+' | '-' | '*' | '/' | '%';
/**
 * There are some error result on native. Use this method to prevent from that.
 *
 * ```ts
 * 3.1 * 3.04 === 9.424000000000001
 * calculate(3.1, '*', 3.04) === 9.424
 * ```
 */
export declare function calculateNumber(number1: number, operator: CalculateNumberOperator, number2: number): number;