/**
 * Checks if `test` is number.
 *
 * @param {*} test The value to check.
 * @returns {boolean} Returns `true` if `test` is number, else `false`.
 * @example
 *
 *      isNumber(5);      //=> true
 *      isNumber(null);   //=> false
 */
export declare const isNumber: (test: any) => test is number;
export default isNumber;