/**
 * Returns a new function which is equivalent to the given function,
 * except that the new function's length property is equal to given length.
 * This does not limit the function to using that number of arguments.
 * It's only effect is on the reported length.
 * @since v0.1.0
 * @keywords wrap
 * @param {number} length -The function parameter's number
 * @param {Function} fn - The function be wrap
 * @param {boolean} isNew - True register new Function
 * @return {Function} New function
 */
declare const arity: (length: number, fn: Function, isNew?: boolean) => Function;
export default arity;