/**
 * Evaluate a string calculation. e.g.
 * @param expression An expression in string form to be evaluated. (Accepted operations include: + - / × ÷ ^ and %)
 * @example
 * calculate("2 + 2") // 4
 * calcualte("5%10") // 5 % of 10 = 0.5
 */
export declare function calculate(expression: string): number;